KEY TO THE SPECIES 69 



2. Verbena stricta Vent. (Hoary Vervain). Downy with soft white hairs, 

 erect, simple or branched, 3-5 dm. high; leaves sessile, obovate or oblong, serrate; 

 spikes tBieb, somewhat clustered, hairy, with rather large purple flowers. Barrens 

 and canons. 



■i- 1- Bracts large and leaf-like ; flowers purplish. 



3. Verbena bracteosa Michx. (Prostrate Verbena). Widely spreading or 

 prostrate, hairy ; leaves wedge-lanceolate, cut-pinnatifld or 3-clef t, short-petioled ; 

 spikes single, remotely flowered with large often lobed bracts longer than the 

 small bluish-purple flowers. Prairies and waste ground. 



♦ * Anthers of longer stamens glandular-tipped ; flowers showy, in heads be- 

 coming spicate. 



4. Verbena bipinnatifida Nutt. (Prairie Verbena). Hirsute-pubescent, 

 spreading by suckers ; stems mostly erect, 15-25 cm. high ; leaves ovate, bipin- 

 natifld, the segments linear-oblong ; flowers showy ; the calyx hardly equaling 

 the narrow bracts ; corolla purple or lilac, its lobes obcordate ; nutlets oblong, re- 

 trorsely scabrous on the grooved commissure. Plains and prairies ; and one of 

 the several parents of the cultivated Verbenas. 



LIX. LABIATiE (Mistt Family) 



Herbs with square steins, opposite aromatic leaves, more or 

 less 2-lipped corolla, 2 or 4 stamens, a single style, and a deeply 

 4-lobed ovary becoming 4 seed-like nutlets. (See Plant Struc- 

 tures, p. 272 ; also p. 274, Figs. 259 and 260.) 



* stamens 2. 



1. Monarda. Calyx tubular ; corolla strongly 2-lipped ; large flowers in 

 whorled beads. 



2. Hedeoma. Flowers in small cymes in the axils of the leaves and bracts ; 

 calyx 13-nerved. 



* * Stamens 4. 



•i- Corolla almost equally 4-lobed ; stamens erect, distant. 



3. Mentha. Flowers small, in axillary spikes or heads ; aromatic fragrant 

 herbs. 



■i- -i- Corolla 2-lipped, the upper lip concave or arched. 

 +t Inner pair of stamens longer than the outer. 



4. Dracocephalum. Corolla small, included in the calyx. 

 ++ ** Outer pair of stamens longer than the inner. 



= Calyx deeply 2-lipped, reticulate-veined (No. 5) or lips entire (No. 6). 

 6. Prunella. Cluster of sessile flowers forming a close spike or head. 



6. Scutellaria. Calyx with a crest or hump-like ridge on the upper side. 

 = = Calyx almost equally 5-toothed obscurely nerved. 



7. Physostegia. Flowers in a bracted spike, upper lip of corolla entire. 

 = =" = Calyx 5-10-nerved, 5-toothed. 



8. Stachys. Flowers in an interrupted spike ; calyx 5-10-nerved. 



