Phylogeny of Ten Kenyan Plectranthus Species in the Coleus Clade Inferred from Leaf Micromorphology, Rbcl and MatK Genes

Table 3

Leaf micromorphology in the ten Plectranthus species.

Species	Nature of the leaf	Stomata occurrence	Stomata type	Epidermal cell type	Trichome type	Glandular trichomes	Mesophyll	Palisade layer	Average number of stomata on the abaxial surface	Average number of stomata on the adaxial surface
P. caninus	Succulent	Ab/Ad	Anomocytic	Polygonal	Long- stalked	Present	Dorsiventral	Long columnar cells	35	25
P. aegyptiacus	Succulent	Ab/Ad	Anomocytic	Sinuous	Short-stalked	Present	Homogenous	Inconspicuous	50	36
P. edulis	Nonsucculent	Ab/Ad	Anomocytic	Polygonal	Short-stalked	Absent	Dorsiventral	Long columnar cells	47	35
P. pseudomarrubioides	Succulent	Ab/Ad	Anomocytic	Sinuous	Short-stalked	Present	Homogenous	Inconspicuous	36	25
P. barbatus	Succulent	Ab/Ad	Anomocytic	Polygonal	Capitate	Present	Dorsiventral	Long columnar cells	45	39
P. lanuginosus	Succulent	Ab/Ad	Anomocytic	Polygonal	Capitate	Present	Homogenous	Inconspicuous	58	49
P. otostegioides	Succulent	Ab/Ad	Anomocytic	Sinuous	Short-stalked	Present	Homogenous	Inconspicuous	28	20
P. montanus	Succulent	Ab/Ad	Anomocytic	Sinuous	Short-stalked	Present	Homogenous	Inconspicuous	28	23
P. ornatus	Succulent	Ab/Ad	Anomocytic	Polygonal	long-stalked	Present	Dorsiventral	Long columnar cells	35	27
P. amboinicus	Succulent	Ab/Ad	Anomocytic	Sinuous	Short-stalked	Absent	Homogenous	Inconspicuous	45	33

Sinuous: containing many curved edges, Polygonal: resembling a polygon, anomocytic: surrounded by more than four subsidiary cells, homogenous mesophyll: a mesophyll whose layers are hard to differentiate, dorsiventral mesophyll: a mesophyll with distinct dorsal and ventral surfaces, capitate: a trichome culminating in a compact head, Ad: adaxial leaf surface, and Ab: abaxial leaf surface.