KEY. 193 



484. Stamens diverging, exserted, the upper pair curved 

 downward, the lower ascending. Anther-cells nearly paral- 

 lel. Tall perennials. Leaves petioled, serrate. Flowers nu- 

 merous, purple or greenish-yellow, in interrupted terminal 

 spikes. Middle lobe of the lower corolla-lip crenate. 



Lophanthus. 

 Stamens all ascending 485 



485. Anther-cells divergent ; anthers approximate in 

 pairs 486 



Anther-cells parallel. Flowers large. Corolla 

 hairy inside, about 1 inch long ; upper lip flattened, or con- 

 cave, 2-lobed, the lower trifid, middle lobe largest. Herbs 

 hairy, about 1 foot high. Leaves cordate, obtusely crenate. 

 Flowers purplish, in aj^proximate whorls at the summit of the 

 stems. Cedronella cordata, Nutt. 



486. Upper lip of the corolla rather flat, notched. An- 

 ther-cells much divergent 487 



Upper lip of the corolla vaulted, notched. Upper 

 tooth of the 5-dentate, 13- to 15-nerved calyx usually much 

 largest. Anther-cells little divergent. Leaves petioled, lan- 

 ceolate, serrate. Bracts leafy, awn-toothed or fringed. 

 Flowers small, bluish, verticillate, forming a terminal head 

 or spike. Dracocephalum parvifolium, Nutt. 



487. Anthers approximate, forming a cross, the cells di- 

 verging at a right angle. Corolla bluish, thrice the length 

 of the calyx ; its lower lip flat. Herbs creeping and trailing. 

 Leaves round-kidney-shaped, crenate, petioled. Flowers few, 

 in loose axillary verticils. Glechoma, L. 



{Nepeta glechoma, Benth.) 

 Anthers not forming a cross. Filaments after 

 flowering bent aside. Corolla whitish, dotted with purple, 

 its lower lip very concave. Leaves cordate, oblong, crenate, 

 whitish downy underneath. Verticils dense, forming inter- 

 i-upted spiked racemes. Nepeta cataria, L. 



488. Stamens divergent (usually exserted) 489 



Stamens parallel 493 



489. Calyx 15-nerved. Stamens exserted. Upper Up of 

 the corolla erect, flat, obscurely notched, the lower 3-cleft, 

 middle, obcordate lobe largest. Herbs growing in tufts. 



