International Journal of Forestry Research

International Journal of Forestry Research / 2014 / Article

Research Article | Open Access

Volume 2014 |Article ID 959875 |

Sumit Srivastava, Ashish Dvivedi, Ravindra Prasad Shukla, "Invasive Alien Species of Terrestrial Vegetation of North-Eastern Uttar Pradesh", International Journal of Forestry Research, vol. 2014, Article ID 959875, 9 pages, 2014.

Invasive Alien Species of Terrestrial Vegetation of North-Eastern Uttar Pradesh

Academic Editor: Robin Reich
Received19 Jan 2014
Accepted21 Apr 2014
Published12 May 2014


The vegetational landscape of north-eastern Terai region at the foot hills of Central Himalayas is a mosaic of grassland, old-field, wasteland, and forest ecosystems. Like many other parts of the country, this region is also infested with alien intruders which not only interfere with the growth and production of food crops but also exercise adverse effects on the biodiversity of native species. The present study attempts to catalogue the invasive alien species of the terrestrial vegetation of north-eastern Uttar Pradesh especially with reference to their habit, taxonomic position, and nativity. A total of 1135 plant species within 580 genera under 119 families are so far known to occur in the region. Of these, only 149 species within 100 genera under 41 families have been found to be invasive aliens as evident from their center of origin, past history, nature of aggregation, and invasion observed under field conditions. About 80% of these invaders have been introduced from neotropics. Out of 173 invasive plants across India, this region shares 149 species, out of which 66% of species have come from Tropical America, 14% from African continent, and the rest from other countries. A better planning in the form of early identification and reporting of infestation and spread of noxious weeds is needed for their control.

1. Introduction

Invasion of alien plant species in recent times has been recognized as the second worst threat after habitat destruction [1]. The International Union for Conservation of Nature and Natural Resources (IUCN) defines “alien invasive species” as an alien species which becomes established in natural or seminatural ecosystems or habitat as agent of change and threatens native biological diversity. Identifying the processes that determine the distribution and diversity of exotic species is a major area of research in ecology because exotics impose significant economic, social, and environmental costs, including human health [2]. Biological invasion may be considered as a form of biological pollution and the significant component of anthropogenic changes leading to extinction of native species. The ecological approach to plant invasion has been mostly based on (a) biological and ecological features promoting the invasion success of particular species [3, 4] and (b) the character and invasibility of invaded communities [5]. Recently, both approaches are treated as complementary [6, 7]. The phytogeographical and floristic approaches are important for research on alien plants [8]. A number of workers have studied and provided catalogues of the invasive alien plant species in different parts of the world [912]. Establishment of a database of naturalized species is the first step in the development of invasion biology. A naturalized species is an introduced species that can consistently reproduce and sustain population over many generations without direct intervention by humans [13, 14]. After successful establishment few naturalized species disperse and produce viable offsprings in areas far from the sites of their introduction. Such naturalized species are then called invasive. It is estimated that as many as 50% of invasive species, in general, can be classified as ecologically harmful [13].

Due to increasing trade and transcontinental transport, the floras of Indian subcontinent have a number of alien species from various parts of the world as evident from the studies made at different parts in India, namely, Upper Gangetic Plain [15, 16], Khandwa Plateau [17], Kodaikanal and Palani Hills [18], Kashmir Himalaya [19, 20], Ranchi [21], Gangtok [22], Allahabad [23], Rajasthan [24], South Gujarat [25], and Doon Valley [26]. This paper presents observations on the habit and nativity of invaders of north-eastern Uttar Pradesh and their impact on the diversity of native plants.

2. The Site, Climate, and Vegetation

The study was conducted in the Terai landscape of north-eastern Uttar Pradesh. This area is characterized by even topography and fine alluvial deposits from Rapti and Gandak rivers. Mean altitude of the study area is 95 m amsl. The region slopes gently from north-west to south-east direction. Administratively the study area (~10,000 km2; 27°5′ to 27°40′N latitude and 83°30′ to 84°E longitude) falls in Gorakhpur district of Uttar Pradesh state. It is bounded by Nepal in the north and Bihar state of India in the east. The landscape comprises a mosaic of human habitations, agricultural fields, grasslands, commercial plantations, and forests. The climate is typically monsoonic with three distinct seasons, namely, summer (March to mid-June), rainy (mid-June to mid-October), and winter (mid-October to February). The total average annual rainfall is about 1814 mm; about 87% of annual rainfall is received during warm rainy season and the rest 13% is distributed in the form of occasional showers from November to May. Relative humidity ranges between 74 and 87%. The mean maximum temperatures during wet summer, winter, and dry summer season are 35.2°, 27°, and 24–39°C and mean minimum temperatures are 26.2°, 12.1°, and 24.2°C, respectively (based on climatic data for 2000–2005). The soil of the region is classified as Gangetic alluvium, ranging from clayey to sandy loam in texture with pH ranging from 6.5 to 7.5. In the northern area there are a few elevated mounds, locally called dhus, which range in size from a few hundred meters to 4-5 km and have brown sandy soil.

3. Data Sources and Methods

Over the period between 1960 and 2013, a comprehensive list of invasive alien plant species of north-eastern Uttar Pradesh was made. The truly aquatic plants were avoided but marshy plants were considered as component of terrestrial vegetation. Several extensive reviews on invasive plant species are available [12, 2733]. The website [34] was also searched for information on the origin and nativity of these invaders. Some information pertaining to the nativity of the species in India has been extracted from 18, 21–24, and 36–40.

Invasive alien species occurring in this region were compiled based on the literature survey, field observation, and discussion with local people. They were divided into three categories: naturalized, interfering, and noxious. Self-replacing plant populations by recruitment through seeds/ramets and capable of independent growth were categorized as naturalized. Alien and native plants which impacted agriculture adversely especially on the disturbed sites were taken as noxious. The adverse impact of noxious species was in the form of competition for space with tillage or forage crops and harbouring of pests or disease vectors, harmful to crops/native species. In addition to efficient vegetative mode of propagation the seeds of these species are mostly wind-distributed and may remain viable for several years. The species which were neither injurious nor noxious but caused profuse interference and hindrance to the growth of crop/native species over a large area by virtue of their vast numbers were taken as interfering.

4. Results

A total of 149 species of invasive aliens of the terrestrial vegetation of north-eastern Uttar Pradesh have been documented. These 149 alien species belonged to 100 genera under 41 families. The alien species amounted to 13.1% of 1135 wild terrestrial plant species of the region. The habit, nativity, and the impact of invasive species on forest, grassland, and agricultural communities were noticed to prepare a catalogue of invasive alien/exotic plant species (Table 1). 100 aliens have their origin in Tropical America compared to 21 species in African continent. About 28 species of alien plants reached the study area from such far off places as Afghanistan, Australia, Brazil, East Indies, Europe, Madagascar, Mascarene Islands, Mediterranean, Mexico, Peru, Temperate South America, Tropical West Asia, West Indies, and Western Europe.

S. No. Name of the Species FamilyHabitNativityCategories

1Acacia farnesiana (L.) WilldMimosaceaeTreeTropical South AmericaNaturalized
2Acanthospermum hispidum DC. AsteraceaeHerbBrazilNaturalized
3Aerva tomentosa AmaranthaceaeHerbTropical AmericaNaturalized
4Ageratum conyzoides L. AsteraceaeHerbTropical AmericaNoxious
5Ageratum houstonianum Mill. AsteraceaeHerbTropical AmericaInterfering
6Alternanthera paronychioides A. St. HillAmaranthaceaeHerbTropical AmericaNaturalized
7Alternanthera pungens KunthAmaranthaceaeHerbTropical AmericaNaturalized
8Alternanthera sessilis (L.) R. Br. ex DC. AmaranthaceaeHerbTropical AmericaNaturalized
9Amaranthus spinosus L. AmaranthaceaeHerbTropical AmericaNaturalized
10Anagallis arvensis L. PrimulaceaeHerbEuropeNaturalized
11Antigonon leptopus Hook and Arn. Polygonaceae climberTropical AmericaNoxious
12Argemone mexicana L. PapaveraceaeHerbTropical South AmericaNoxious
13Argemone ochroleuca Sweet. PapaveraceaeHerbMexicoInterfering
14Asphodelus tenuifolius Cav. LiliaceaeHerbTropical AmericaNaturalized
15Blainvillea acmella (L.) PhilipsonAsteraceaeHerbTropical AmericaInterfering
16Blumea eriantha DC. AsteraceaeHerbTropical AmericaInterfering
17Blumea lacera (Burm f.) DC. AsteraceaeHerbTropical AmericaInterfering
18Blumea obliqua (L.) DruceAsteraceaeHerbTropical AmericaInterfering
19Borassus flabellifer L. ArecaceaeTreeTropical AfricaNaturalized
20Calotropis gigantea (L.) R. Br. AsclepiadaceaeShrubTropical AfricaInterfering
21Calotropis procera (Ait) R. Br. AsclepiadaceaeShrubTropical AfricaInterfering
22Cannabis sativa L. CannabaceaeHerbCentral AsiaInterfering
23Cassia absus L. CaesalpiniaceaeHerbTropical AmericaNaturalized
24Cassia alata L. CaesalpiniaceaeShrubWest Indies Naturalized
25Cassia hirsute L. CaesalpiniaceaeHerbTropical AmericaNaturalized
26Cassia obtusifolia L. CaesalpiniaceaeHerbTropical AmericaNaturalized
27Cassia occidentalis L. CaesalpiniaceaeHerbTropical South AmericaNaturalized
28Cassia pumila Lam. CaesalpiniaceaeHerbTropical AmericaNaturalized
29Cassia tora L. CaesalpiniaceaeHerbTropical South AmericaNoxious
30Celosia argentea L. AmaranthaceaeHerbTropical AfricaNaturalized
31Chenopodium album L. ChenopodiaceaeHerbEuropeInterfering
32Chenopodium ambrosioides L. ChenopodiaceaeHerbTropical AmericaInterfering
33Chenopodium murale L. ChenopodiaceaeHerbTropical AmericaNaturalized
34Chloris barbata Sw. PoaceaeHerbTropical AmericaNaturalized
35Chrozophora rottleri (Geis) SpringEuphorbiaceaeHerbTropical AfricaNaturalized
36Cleome burmanni CapparidaceaeHerbWest AfricaNaturalized
37Cleome gynandra L. CapparidaceaeHerbTropical AmericaNaturalized
38Cleome rutidosperma DC. CapparidaceaeHerbTropical AmericaNaturalized
39Cleome viscosa L. CapparidaceaeHerbTropical AmericaNaturalized
40Clerodendrum splendens G. DonVerbenaceae ClimberAfricaInterfering
41Convolvulus arvensis L. ConvolvulaceaeHerbEuropeNaturalized
42Corchorus aestuans L. TiliaceaeHerbTropical AmericaNaturalized
43Corchorus fascicularis Lam. TiliaceaeHerbTropical AmericaNaturalized
44Corchorus olitorius L. TiliaceaeHerbTropical AfricaNaturalized
45Coronopus didymus (L.) SmithBrassicaceaeHerbTropical AmericaInterfering
46Crotalaria mucronata.Ait PapilionaceaeHerbTropical AmericaInterfering
47Croton bonplandianum Boil. EuphorbiaceaeHerbTemperate South AmericaNaturalized
48Cryptostegia grandiflora R. Br. AsclepiadaceaeHerbMadagascarInterfering
49Cuscuta reflexa Roxb. CuscutaceaeHerbMediterraneanInterfering
50Cynodon dactylon (Linn.) PersPoaceae HerbAfricaNaturalized
51Cyperus difformis L. CyperaceaeHerbTropical AmericaNaturalized
52Cyperus flabelliformis Rottb. CyperaceaeHerbAfricaInterfering
53Cyperus iria L. CyperaceaeHerbTropical AmericaNaturalized
54Cyperus cyperoides L. CyperaceaeHerbTropical AmericaNaturalized
55Datura innoxia Mill. SolanaceaeShrubTropical AmericaNoxious
56Datura metel L. SolanaceaeShrubTropical AmericaInterfering
57Datura stramonium L. SolanaceaeShrubTropical AmericaNoxious
58Digera muricata (L.) MartAmaranthaceaeHerbSouth-West AsiaInterfering
59Duranta repens Linn. VerbenaceaeShrubAmericaNaturalized
60Echinochloa colonum (L.) LinkPoaceaeHerbTropical South AmericaNaturalized
61Echinochloa crus-galli (L.) Beauv. PoaceaeHerbTropical South AmericaNoxious
62Echinops echinatus Roxb. AsteraceaeHerbAfghanistanNaturalized
63Eclipta prostrata (L.) Mart. AsteraceaeHerbTropical AmericaNaturalized
64Emilia sonchifolia (L.) DC. AsteraceaeHerbTropical AmericaNaturalized
65Erigeron bonariensis L. AsteraceaeHerbSouth AmericaInterfering
66Eupatorium adenophorum SprengelAsteraceaeShrubMexicoNoxious
67Eupatorium odoratum L. AsteraceaeShrubTropical AmericaInterfering
68Euphorbia chamaesyce L. EuphorbiaceaeHerbWest Africa & MauritiusNaturalized
69Euphorbia hirta LEuphorbiaceaeHerbTropical AmericaNaturalized
70Euphorbia  heterophylla L. EuphorbiaceaeHerbTropical AmericaNaturalized
71Evolvulus nummularius(L.) L. ConvolvulaceaeHerbTropical AmericaNaturalized
72Flaveria trinervia (Spreng.) C. MoharAsteraceaeHerbTropical Cent. AmericaNaturalized
73Galinsoga parviflora Cav. AsteraceaeHerbTropical AmericaNaturalized
74Glossocardia bosvallia(L. f.) DC. AsteraceaeHerbWest IndiesNaturalized
75Gnaphalium polycaulon Pers.AsteraceaeHerbTropical AmericaInterfering
76Gomphrena celosioides Mart. AmaranthaceaeHerbTropical AmericaNaturalized
77Gomphrena globosa Linn. AmaranthaceaeHerbAmerica Naturalized
78Grangea maderaspatana (L.) Poir.AsteraceaeHerbTropical South AmericaNaturalized
79Hyptis suaveolens (L.) PoitLamiaceaeHerbTropical AmericaInterfering
80Imperata cylindrica (L.) Raensch. PoaceaeHerbTropical AmericaNaturalized
81Indigofera glandulosa Roxb. Ex WilldPapilionaceaeHerbTropical AmericaNaturalized
82Indigofera hirsuta Hook. PapilionaceaeHerbTropical AfricaNaturalized
83Indigofera linearis AliPapilionaceaeHerbTropical AfricaNaturalized
84Indigofera linifolia (L. f.) Retz. PapilionaceaeHerbTropical South AmericaNaturalized
85Ipomoea eriocarpa R. Br. ConvolvulaceaeClimberTropical AfricaInterfering
86Ipomoea fistulosa Mart DC. ConvolvulaceaeShrubTropical AmericaInterfering
87Ipomoea muricata L. ConvolvulaceaeClimberTropical AmericaNaturalized
88Ipomoea nil (L.) Roth. ConvolvulaceaeClimberNorth AmericaNaturalized
89Ipomoea obscura (L.) Ker. Gawl. ConvolvulaceaeClimberTropical AfricaInterfering
90Ipomoea pes-tigridis L. ConvolvulaceaeClimberTropical East AfricaInterfering
91Ipomoea purpurea (Linn.) RothConvolvulaceaeHerbAmericaInterfering
92Ipomoea quamoclit L. ConvolvulaceaeClimberTropical AmericaInterfering
93Jatropha curcas EuphorbiaceaeHerbTropical AmericaNaturalized
94Jatropha gossypifolia L. EuphorbiaceaeShrubBrazilNaturalized
95Lagascea mollis CavAsteraceaeHerbTropical Cent. AmericaNoxious
96Lantana camara L. VerbenaceaeShrubTropical AmericaNoxious
97Leonotis nepetifolia (L.) R. Br. LamiaceaeHerbTropical AfricaInterfering
98Leucaena leucocephala (Lam.) de. WitMimosaceaeHerbTropical AmericaNoxious
99Lippia alba VerbenaceaeHerbTrop. America & West IndiesInterfering
100Ludwigia adscendens (L.) HaraOnagraceaeHerbTropical AmericaNaturalized
101Ludwigia octovalvis (Jacq.) RavenOnagraceaeHerbTropical AmericaNaturalized
102Ludwigia parviflora Roxb. OnagraceaeHerbTropical AfricaNaturalized
103Malvastrum coromandelianum (L.) Gar. MalvaceaeHerbTropical AmericaNaturalized
104Martynia annua L. PedaliaceaeHerbTropical AmericaInterfering
105Mecardonia procumbens (Mill.) SmallScrophulariaceaeHerbTropical North AmericaNaturalized
106Melilotus alba Desv. PapilionaceaeHerbEuropeNaturalized
107Melochia corchorifolia L. SterculiaceaeHerbTropical AmericaNaturalized
108Merremia dissecta (Jacq.) Hallier f. ConvolvulaceaeHerbTropical AmericaNaturalized
109Mikania micrantha Kunth. AsteraceaeClimberTropical AmericaNoxious
110Mimosa pudica L. MimosaceaeHerbBrazilNaturalized
111Nicotiana plumbaginifolia Viv. SolanaceaeHerbTropical AmericaNaturalized
112Ocimum americanum L. LamiaceaeHerbTropical AmericaNaturalized
113Opuntia elatior Mill. CactaceaeHerbTropical AmericaNoxious
114Oxalis corniculata L. OxalidaceaeHerbEuropeNaturalized
115Oxalis corymbosa DC. OxalidaceaeHerbSouth AmericaNaturalized
116Parthenium hysterophorus LAsteraceaeHerbTropical North AmericaNoxious
117Passiflora foetida L. PassifloraceaeHerbTropical South AmericaInterfering
118Pedalium murex L. PedaliaceaeHerbTropical AmericaNaturalized
119Peperomia pellucida (L.) Kunth. PiperaceaeHerbTropical South AmericaNaturalized
120Peristrophe paniculata (Forsk.) BrummittAcanthaceaeHerbTropical AmericaInterfering
121Physalis minima L. SolanaceaeHerbTropical AmericaNaturalized
122Physalis peruviana LSolanaceaeHerbTropical AmericaInterfering
123Pilea microphylla UrticaceaeHerb Tropical South AmericaNaturalized
124Portulaca oleracea L. PortulacaceaeHerbTropical S. AmericaNaturalized
125Portulaca quadrifida L. PortulacaceaeHerbTropical AmericaNaturalized
126Rauvolfia tetraphylla ApocynaceaeHerbWest IndiesNaturalized
127Ricinus communis Linn. EuphorbiaceaeShrubAfricaInterfering
128Rubus ellipticus SmithRosaceaeShrubTropical AmericaNaturalized
129Ruellia tuberosa L. AcanthaceaeHerbTropical AmericaNaturalized
130Saccharum spontaneum L. PoaceaeHerbTropical West AsiaInterfering
131Scoparia dulcis L. ScrophulariaceaeHerbTropical AmericaNaturalized
132Sesbania bispinosa (Jacq.) W. F. WightPapilionaceaeShrubTropical AmericaNaturalized
133Sida acuta Burm f. MalvaceaeHerbTropical AmericaNaturalized
134Solanum khasianum SolanaceaeHerbTropical AmericaInterfering
135Solanum nigrum L. SolanaceaeHerbTropical AmericaNaturalized
136Solanum torvum Sw. SolanaceaeShrubWest IndiesInterfering
137Solvia anthemifolia (Juss) R. AsteraceaeHerbAmericaInterfering
138Sonchus asper Hill. Asteraceae HerbMediterraneanInterfering
139Sonchus oleraceus L. AsteraceaeHerbMediterraneanInterfering
140Synedrella nodiflora (L.) Gaertn. AsteraceaeHerbWest IndiesNaturalized
141Tithonia diversifolia (Hense) A. GrayAsteraceaeShrubMexicoNaturalized
142Trema orientalis L. UlmaceaeTreeAfricaNaturalized
143Tribulus terrestris L. ZygophyllaceaeHerbTropical AmericaNaturalized
144Tridax procumbens L. AsteraceaeHerbTropical Cent. AmericaNaturalized
145Triumfetta rhomboidea Jacq. TiliaceaeHerbTropical AmericaNaturalized
146Urena lobata L. MalvaceaeShrubTropical AfricaInterfering
147Xanthium strumarium L. AsteraceaeHerbTropical AmericaNoxious
148Youngia japonica (L.) DC. AsteraceaeHerbTropical South AmericaNaturalized
149Zephyranthes candida Lindl. AmaryllidaceaeHerbAmericaNaturalized

The herbaceous elements predominated the regional alien flora. The number of dicot alien species was 136, under 93 genera and 32 families. On the other hand, there were only 13 species of monocot aliens distributed among 9 genera under 5 families (Amaryllidaceae, Arecaceae, Cyperaceae, Liliaceae, and Poaceae). Of 41 families having alien species, Asteraceae was the most dominant (29 species) followed by Convolvulaceae (11), Amaranthaceae and Solanaceae (9 species each), Euphorbiaceae (8), Caesalpiniaceae and Papilionaceae (7 each), Poaceae (6), Capparidaceae, Cyperaceae, Tiliaceae, and Verbenaceae (4 each), Asclepiadaceae, Chenopodiaceae, Lamiaceae, Malvaceae, Mimosaceae, and Onagraceae (3 each), Acanthaceae, Oxalidaceae, Papaveraceae, Pedaliaceae, Portulacaceae, and Scrophulariaceae (2 each), and Amaryllidaceae, Apocynaceae, Arecaceae, Brassicaceae, Cannabaceae, Cuscutaceae, Cactaceae, Liliaceae, Polygonaceae, Primulaceae, Passifloraceae, Piperaceae, Rosaceae, Sterculiaceae, Ulmaceae, Urticaceae, and Zygophyllaceae (1 species each). Of these aliens, 15 species were judged as noxious, 43 species as interfering, and 91 as naturalized species (Figure 1). Habit wise analysis shows that 80% of species are herbs, 12% are shrubs, 6% are herbaceous climbers, and 2% are trees (Figure 2). The eight dominant families contributed 47% of the invasive alien flora of wild terrestrial vegetation of north-eastern Uttar Pradesh (Figure 3).

5. Discussion

Alien species are nonnative or exotic organisms that occur outside their natural adapted ranges and dispersal potential [35]. These invasive species are widely distributed in all kinds of ecosystems throughout the world and include all categories of living organisms. Nevertheless, plants, mammals, and insects comprise the most common types of invasive alien species in terrestrial environments [36]. Many alien plant species support our farming and forestry systems in a big way. However, some of these aliens become invasive when they are introduced deliberately or unintentionally outside their natural habitats into new areas where they express the capability to establish, invade, and outcompete native species [37]. An important requirement for successful colonization of invaders is open habitat with reduced competition. Generally, the microsites created by grazing may be occupied by invader species [3840]. The invaders usually dominate the highly disturbed and man-made landscapes. So far, no ready hand catalogue of invasive species is available for this region. The present catalogue of invasive exotic species is likely to serve as basic information for future research towards conservation of native plant species of the region.

As evident from the data, the vegetation of north-eastern Uttar Pradesh shows greater incidence of invaders as compared to the whole of Uttar Pradesh [41] and India [42]. Reddy documented all invasive plant species irrespective of their habitat and use. In the present case, however, only the wild invasive plant species of terrestrial vegetation were considered and truly aquatic and ornamental invasive species were excluded. Many species, recorded as invader of north-eastern Uttar Pradesh, are common to Indian Himalayan region and the whole of Uttar Pradesh. For example, 103 invaders are common to the whole of the state of Uttar Pradesh [41] and 95 species to the whole of India [42]. Among the invasive species of north-eastern Uttar Pradesh, 70.5% are native to American continent. Other such studies vary slightly in percent share of tropical American nativity. While Singh et al. [41] reported 73% of invasive plant species of Uttar Pradesh, for Indian Himalayan region, however, Sekar [43] also noticed 73% invaders of American nativity. Reddy [42] noticed 58% of the invasive flora of India to be natives of American continent.

Alien species have been classified into naturalized and noxious species by various workers [13, 44, 45]. Our field observation and discussion with local people indicate that there are 15 most noxious invasive plant species in this region, namely, Ageratum conyzoides, Antigonon leptopus, Argemone mexicana, Cassia tora, Datura stramonium, Datura innoxia, Echinochloa crus-galli, Eupatorium adenophorum, Lantana camara, Lagascea mollis, Leucaena leucocephala, Mikania micrantha, Parthenium hysterophorus, Opuntia elatior, and Xanthium strumarium. Some species such as Ageratum conyzoides, Eupatorium adenophorum, Lantana camara, and Parthenium hysterophorus are harmful to native species [41, 46, 47]. Further, some of these species are known to be highly allergic, causing diseases in human beings [48, 49]. Since they are rarely palatable, their dominance drastically reduces the number of grazers by way of reducing the carrying capacity of the pasture and wasteland [40]. Datura innoxia and Datura stramonium are serious threat to the native species of the region and are known to cause delay in seedling growth of neighbouring plants [50]. Leucaena leucocephala alters the natural growth of native plants because not only it obstructs plenty of sunlight to reach surface layer but also its allelopathic exudates cause retardation in seedling growth of neighbouring plants [51]. Mikania micrantha could climb trees and cover the whole habitats through fast vegetative propagation and could also suppress the growth of crops and natural vegetation through competition and allelopathic effects [45]. These species occur as invasive species under shifting agriculture in north-eastern Uttar Pradesh and combine an effective seed based reproduction with clonal propagation [52]. Many invasive species such as species of Eupatorium tend to respond to temporarily nutrient-enriched soil substrata and grow and quickly cover the gaps in disturbed forests. They can destroy arable soil, negatively affect the growth of orchard, and could also supplant grasses in pasture, excreting a toxic volatile that prevents grazing [48].

The herbaceous invasive plant species were recorded as the dominant invasive flora (80%) of north-east Uttar Pradesh, in the form of 119 invasive species. The greater viability and tolerance to harsh conditions could result in the preponderance of herbs across the region. Invasive species of Asteraceae exhibited a much higher reproductive capacity than those of other families. This high reproductive potential is achieved by partitioning of reproductive capital into a large number of propagules that are minute, light, and wind dispersed [53]. Various other workers have also reported the dominance of Asteraceae among invasive alien species in Uttar Pradesh [41] and in Indian Himalayan region [43].

The invasive species cause loss of biodiversity through species extinction and their impact on ecosystem function. Differences between native and invasive plant species in their resource acquisition and consumption may cause a change in soil structure, decomposition, and nutrient content of the soil. Thus, invasive species are a serious hindrance to conservation with significant undesirable impacts on the goods and services provided by ecosystems. Biological invasions now operate on a global scale and are likely to undergo rapid increase in this century due to interaction with other changes such as increasing travel and tourism. A quick monitoring of invasion can, therefore, be done through qualitative approach like species inventory method.

6. Conclusion

Plant invasions in the new areas alter indigenous community composition, deplete species diversity, affect ecosystem process, and thus cause huge economic and ecological imbalance. A quick inventory and plant identification network are, therefore, needed for early detection and reporting of noxious and naturalized weeds in order to control the spread of invasive plant species.

Conflict of Interests

The authors declare that there is no conflict of interests regarding the publication of this paper.


The authors are thankful to the Head Department of Botany, D.D.U., Gorakhpur University, Gorakhpur, for providing access to departmental herbarium and other required facilities. They also feel grateful to the anonymous reviewer for his critical comments and suggestions to improve the quality and clarity of the content and to Dr. Robin Reich for very quick response.


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