MINT AND VERVAIN FAMILIES 403 



9. NEPETA. Catmint. 



Perennials, mostly sweet-scented : calyx nearly equally 5-toothed ; corolla 

 2-lippod, the upper lip erect and somewhat concave, the lower 3-lobed: 

 stamens 4, in pairs under the upper lip, the outer pair the shorter. 



N. Cataria, Linn. Common catmint or catnip. Figs. 213, 414. Erect, 

 2-3 ft., pubescent: leaves cordate-ovate, crenate, grayish: corolla tinted: 

 flowers in interrupted spikes. Introduced from Europe. 



N. hederacea, Trev. (N. Glechoma, Benth.). Ground ivy. Gill-over-the- 

 ground. A weed from Europe, but familiar almost everywhere: creeping, 

 with rounded, crcnately margined, petioled leaves: flowers bluish purple, 

 small. 



10. MARRUBIUM. Horehound. 



Erect perennials, with white- woolly aspect: calyx nearly equally 5-10- 

 toothed, the teeth very sharp: corolla 2-lipped, the upper lip erect and 

 notched, the lower one spreading and 3-lobed: stamens 4, included in the 

 corolla-tube. There are a number of Old World species, but only the 

 following seems to have run wild in this country:. 



M. vulgare, Linn. Common horehound. Leaves broad-ovate and 

 crenate: flowers small, white, in dense whorls. Europe, but common. 



11. LEONURUS. Motherwort. 



Erect perennials with green aspect: calyx about equally 5-toothed, the 

 teeth becoming spine-like; corolla 2-lipped, the upper lip somewhat arched 

 and entire, the lower spreading and 3-lobed: stamens 4, ascending under the 

 upper lip: nutlets 3-angled. 



L. Cardiaca, Linn. Common motherwort. Tall: leaves rounded and 

 lobed: corolla purple, the upper lip bearded; flowers in axillary whorls. 

 Introduced from Europe. Common. Other introduced species may now and 

 then be found. 



XXXIV. VERBENACE.E. Vervain Family. 



Herbs, shrubs or trees: leaves opposite or whorled (in our spe- 

 cies), exstipulate: flowers monopetalous, often irregular, in bracted 

 cymes or panicles; calyx free trom the ovary, 4-5-cleft; corolla some- 

 times regular, buc often more or less 2-lipped: stamens 4 (rarely 

 2), in unequal pairs, inserted on corolla, alternate with lobes; style 

 1; ovary mostly 2- to 4-celled (not lobed), with style from summit: 

 fruit dry or drupe-like. About 1,200 species, mostly tropical. 



VERBENA. Vervain. 



Herbs with simple, opposite, serrate or pinnately-lobed leaves: flowers 

 usually sessile, bracted, in terminal spikes: corolla salver- pr funnel-foriu ; 

 with border somewhat unevenly 5-cjeft, 



