162 COMMON CANADIAN WILD PLANTS. 



16. Physoste'gla. Calyx not 2-lipped, 5-toothed or lobed, thin and 



membranaceous, inflated-bell-shaped in fruit. Anther-cells par- 

 allel. Flowers large and showy, rose-colour variegated with pur- 

 ple, opposite, in terminal leafless spikes. 



17. Brunel'la. Calyx 2-lipped, flat on the upper side, closed in fruit; 



the upper lip 3-toothed, the lower 2-cleft. Filaments 2-toothed at 

 the apex, the lower tooth bearing the anther. Flowers violet, in a 

 close terminal spike or head, which is very leafy-bracted. 



18. Srn f < 1 1 :t ri:i . Calyx 2-lipped, short, closed in fruit, the lips rounded 



and entire, the upper with a projection on the back. Corolla blue 

 or violet, the tube elongated and somewhat curved. Anthers of 

 the lower stamens 1-celled, of the upper 2-celled. Flowers solitary 

 in the axils of the upper leaves, or in axillary or terminal 1-sided 

 racemes. 



19. Marrubt urn. Calyx 10-toothed, the teeth spiny and recurved after 



flowering. Stamens 4, included in the corolla tube. Whitish 

 woolly plant s with small white flowers in head-like whorls. 



20. (.alt-op sis. Calyx 5-toothed, the teeth spiny. The middle lobe of 



the lower lip of the corolla inversely heart-shaped, the palate with 

 2 teeth at the sinuses. Stamens 4, the anthers opening cross-wise. 

 Flowers purplish, in axillary whorls. 



21. SI.-H-li A s. Calyx 5-toothed, beset with stiff hairs, the teeth spiny, 



diverging in fruit. Stamens 4, the outer pair turned down after 

 discharging their pollen. Flowers purple, crowded in whorla, 

 these at length forming an interrupted spike. 



22. Leonu'rns. Calyx 5-toothed, the teeth spiny, and spreading when 



old. The middle lobe of the lower lip of the corolla narrowly 

 oblong-obovate, entire. Flowers pale purple, in close whorls in 

 the axils of the cut-lobed leaves. Nutlets sharply 3-angled. 



23. I. a mi ii in. Calyx tubular bell-shaped, 5-nerved, with 5 nearly equal 



awl-pointed teeth. Corolla dilated at the throat ; upper lip arched 

 and narrowed at the base, the middle lobe of the lower lip notched 

 at the apex and narrowed at the base. Herbs with purple flowers 

 in few or several whorls or heads. 



24. Hallo tit. Calyx nearly funnel-form, 10-ribbed, with a spreading 



5-toothed border. Whorls of purplish flowers dense. Anthers 

 exserted. Plant erect, hairy (but green). 



1. i r I < i: u >i. L. GERMANDER. 



1. T. Canadense, L. (AMERICAN GERMANDER. WOOD 

 SAGE.) Stem 1-3 feet high, downy. Leaves ovate-lanceolate, 

 serrate, short-petioled, hoary beneath. Flowers in a long 

 spike. Low grounds. 



