LABIATiB. 105 



YERBENACE^. 



Corolla nearly equally 5-lobed : calyx 5-toothed: small flowers in spikes 1 



Corolla bilabiate, 4-lobed: calyx 2-cleft: small heads on slender peduncles ^ . . . d 



1. VERBENA, Toumefort. 

 ofS.cinalis, L. Spikes filiform, bracts minute: leaves pinnatifld. 

 polystachya, HBK. Leaves serrate: corolla a line broad. Bare, 

 hastata, L. Erect, 3-6 ft high: leaves coarsely serrate, petioled. 

 prostata, R. Br. Diffuse, spreading, hairy: corolla 2 lines broad, 

 bracteosa, Michx. Similar, but rigid bracts exceeding smaller flowers. 



2. LIPPIA, Linnaeus. 

 L L. nodiflora, Michx. Creeping: peduncles 1-4 in. long: flowers rose to white. 



LABTATiE. 



§ 1. Stamens 4, coiled in the bud, much exserted through a cleft in the upper lip: leaves 



entire: corolla and curved filaments blue or purple 1 



I 2. Stamens erect or ascending, the posterior pair shorter or wanting: anther-cells 

 short, close together or united: upper lip of corolla not concave or hooded (except 

 in No. 9). 

 • Corolla small, almost equally 4-lobed: axillary flowers in deme whorl-lihe clusters, the upper 



axils flowerless. 



Stamens 4, nearly equal, all perfect: calyx 5 toothed 2 



Stamens 2, with anthers, posterior pair sterile or wanting 3 



* * Corolla bilabiate: stamens 4^ 

 Flowers capitate: calyx equally 5-toothed: stamens distinct, straight. 



Upper lip of corolla entire or merely notched 4 



Upper lip 2-cleft: stamens exserted 5 



Flowers solitary or in clusters, axillary: curved stamens all perfect. 



Flowers small, white or purple: not J in. long 6 



Flowers over an inch long, orange; peduncles bracteate 7 



Flowers in oblong heads or interrupted spikes, blue or purple 8 



Flowers in axillary clusters, rose and white: upper anthers imperfect 



Flowers with white or purplish •oroUa an inch long: stamens perfect 10 



g 3. Stamens 2, the upper pair rudimentary or wanting: anthers 1-celled or with 2 cells 

 videly separated on the ends of a filament-like connective: flowers in dense terminal 

 heads or glolwso whorls (except sp. {< o/ iVo. i-ci. 

 Connective versatile upon the short tllament. Lcav^ pmnatifld 11 



