A Survey of Ant Species in Three Habitats at Mount St. Helens National Volcanic Monument

Table 6

List of plant species and numbers found in each habitat type at Mount St. Helens National Volcanic Monument between 22 and 25 July 2008*.

Genus	Species	Habitat type**			Total number
		PPLV	PPHV	BDZ
Unidentified grasses***		0	90	110	200
Hypochaeris	radicata	0	125	15	140
Lupinus	lepidus	0	115	0	115
Hieracium	albiflorum	0	40	1	41
Anaphalis	margaritacea	0	1	27	28
Abies	procera	0	0	13	13
Fragaria	virginiana	0	0	10	10
Penstemon	cardwellii	1	8	1	10
Carex	spp.	0	0	9	9
Juncus	spp.	0	0	8	8
Castilleja	miniata	0	7	0	7
Agrostis	exarata	0	6	0	6
Unidentified ferns		0	0	3	3
Achillea	millefolium	0	2	0	2
Epilobium	angustifolium	0	0	1	1
Salix	spp.	0	0	1	1
Spraguea	umbellata	1	0	0	1
Vaccinium	membranaceum	0	0	1	1

* Only plants that fell within the 0.5 m² quadrats placed in the center of each ant survey circle were included.
**PPLV: Pumice Plain-Low Vegetation, PPHV: Pumice Plain-High Vegetation, BDZ: Blowdown Zone.
***The number of grass plants is an estimate due to the difficulty of distinguishing one individual from another.