150 Flora of the Palouse Regio7i 



broadly lanceolate, acute or acuminate, coarsely serrate, 6-12 cm. long, 

 short-petioled: spikes numerous, clustered at the summit of the stem, slen- 

 der, 5-15 cm. long: bracts shorter than the calyx: corolla blue, 3 mm. broad. 

 Along Snake River, rare. 



V. bracteosa Michx. Branches prostrate or spreading, 15-30 cm. long, 

 rough-hairy throughout, the root often becoming woody: leaves oblong or 

 obovate, cuneate at base, pinnately 3-cleft, coarsely dentate, 1-3 cm. long; 

 petiole short, margined: spikes terminal, 1-10 cm. long; upper bracts entire, 

 lanceolate, acuminate, becoming rigid; the lower somewhat cleft, all exceed- 

 ing the flowers: corolla blue, 4 mm. long: anthers without appendages. 

 Common along »Snake River and spreading elsewhere. 



Family 67. L,ABIATAE. 



Mostly aromatic herbs: stems 4-sided: leaves simple, opposite: 

 corolla more or less 2-lipped, the upper lip 2-lobed or sometimes 

 entire, the lower 3-lobed: stamens on the corolla-tube, didynamous 

 or diandrous: style 2-lobed at the apex; ovary deeply 4-lobed: fruit 

 of 4 seed-like nutlets or akenes, each with one erect seed; endos- 

 perm mostly none. 



Corolla nearly regular. 



Anther-bearing stamens 2. 



Anther-bearing stamens 4. 



Lobes of corolla 5. 



Lobes of corolla 4. 



Corolla irregular, distinctly 2-lipped. 



Upper pair of stamens longer than the lower. 

 Stamens short, included in the corolla-tube. 

 Stamens ascending under upper corolla-lip. 

 Stamens exserted from the corolla. 252. lophaxthus. 



Upper pair of stamens shorter than the lower. 



Calyx with a protuberance on the upper side. 250. Scutellaria. 

 Calyx not gibbous on the upper side. 



Upper corolla-lip flattish, neither concave nor hooded. 



257. MICROMERIA. 



Upper corolla-lip hooded or at least concave. 



Calyx distinctly 2-lipped. 254. pruxella. 



Calyx not distinctly 2-lipped. 



Corolla-tube longer than the calyx. 



255. LAMICM. 

 Corolla-tube about equalling the calyx. 



256. STACHVS. 



249. TRICHOSTEMA. 



Low annual branched herbs, or somewhat woody plants: leaves 

 entire: calyx bell-shaped, oblique, deeply 5-cleft, the 3 upper teeth 

 elongated and partly united, the 2 lower very short: corolla small, 

 almost equally 5-parted, the 3 lower lobes more or less united: 

 stamens 4, much exserted; anther-cells divergent and at length 

 confluent. 



