196 PBAGTIGAL BOTANY. 



curved, surrounded with many bristle-pointed bracts. Co- 

 rolla white, pubescent. Leaves round-ovate, rugose, crenate- 

 toothed, hoary-pubescent. Flowers in dense, axillary, ses- 

 sile, hairy whorls. Marrubium vulgare, L. 



001. Calyx-teeth spiny-tipped 502 



Calyx-teeth not spiny-tipped. 504 



c»OS. Anther-cells opening transversely by 2 valves ; the 



inner valve ciliate-fringed. Leaves notched. Galeopsis. 



Anlher-cells opening lengthwise 503 



503. Achenia rounded at the top. Whorls 2- to many- 

 flowered, approximate in a teiminal, spike-like raceme. 



Stachys. 

 Achenia truncate, 3-angled at the top. Calyx- 

 teeth, when old, very hard. Upright herbs. Leaves cut- 

 lobed. Flowers pale purple, or whitish, in close axillary 

 whorls. Leonurus. 



504. Corolla inflated 505 



Corolla not inflated, short. Calyx salver-form, 10- 

 ribbed, 5-toothed, the teeth longer than the corolla. An- 

 thers exserted. Herbs erect, hairy. Leaves ovate, dentate. 

 Flowers purplish, in dense whorls. Ballota nigra, L. 



505. Anther- cells divergent. Corolla slightly inflated ; 

 lips large 506 



Anther-cells parallel. Corolla much inflated in 

 the throat ; lips very small ; upper lip erect, lower 3-parted. 

 Herbs smooth. Leaves oblong-ovate to narrowly lanceo- 

 late, remotely toothed, or sometimes nearly entire. Flowers 

 large, flesh-color, tinged with purj^le, in terminal leafless, 

 simple, or panicled dense spikes. 



Physostegia Virginiana, Benth. 



506. Upper corolla-lip helmeted, keeled, broad, entire or 

 notched, incurved, bearded with white hairs inside ; lower 

 lip 3-cleft. Filaments of the upper pair of stamens with an 

 awl-shaped appendage at the base. Herb 3-5 feet high. 

 Leaves ovate, cordate, crenate, petioled. Flowers purple, in 

 dense, axillary, bracted whorls. Phlomis tuberosa, L. 



Upper corolla-lip ovate, arched, bearded, or naked ; 

 lower lip 3-lobed, middle lobe obcordate and contracted at 



