102 Flora of the Palouse Region 



calyx 4-5-toothed or cleft; lobes equal or unequal, sometimes 2- 

 lipped: petals more or less united or separate, perigynous or 

 hypogynous, usually papilionaceous, that is, with the upper or 

 odd petal (standard) larger than the others and usually turned 

 backward or spreading; the two lateral ones winged, oblique and 

 exterior to the two lower; the last pair connivent and commonly 

 more or less coherent by their anterior edges, forming the keel, 

 which usually encloses the stamens and pistil: stamens 10, rarely 

 5 or many, monadelphous, diadelphous or occasionally distinct: 

 pistil 1, 1 -celled or several-celled by the intrusion of partitions, 

 free; ovules i-many: fruit a legume; endosperm mostly none. 



Stamens distinct. 166. thermopsis. 



Stamens monadelphous or diadelphous. 



Leaves abruptly pinnate, with tendrils, which are sometimes reduced to 

 bristles. 

 Style slender, with a tuft of hairs at the summit. 

 Style flattened, bearded along the inner side. 

 Leaves odd-pinnate or palmate, without tendrils. 

 Stamens monadelphous; anthers of two sorts. 

 Stamens diadelphous; anthers of two sorts. 

 Stamens diadelphous; anthers all alike. 



Leaves digitately 3-foliolate, rarely i-foliolate. 

 Leaflets denticulate. 



Flowers in long racemes. 

 Flowers in heads or umbels. 

 Leaflets entire. 

 Leaves pinnately several-many-foliolate. 



Pod not prickly : foliage not glandular-punctate. 



172. ASTRAGALUS. 



Pod prickly: foliage glandular-punctate. 173. GI,ycyrrhiza 



166. THERMOPSIS. 



Perennial herbs: leaves alternate, palmately 3-foliolate, with 

 large foliaceous stipules: flowers large, yellow, in terminal or ax- 

 illary racemes: calyx campanulate, the lobes equal and separate or 

 the two upper united: standard nearly orbicular, equalling the 

 oblong wings and about equalling the keel: stamens 10, distinct: 

 ovary sessile or short-stipitate: ovules numerous: pod sessile or 

 short-stipitate in the calyx, flat, linear, straight or curved. 



T. montana Nutt. Stout, .6-1 m. high, the glabrous somewhat glaucous 

 stems slightly branched above: leaflets oblong-ovate or obovate, mostly ob- 

 tuse, cuneate at base, 3-6 cm. long, glabrous above, pubescent beneath; 

 stipules ovate or lanceolate, large; petioles larger than the leaflets: raceme 

 terminal, short-peduncled, 8-16 cm. long: flowers yellow, somewhat 

 whorled, stout- pedicelled: calyx pubescent, with short broad teeth: corolla 

 nearly 2 cm. long: pods pubescent, dark-colored, linear, slender-beaked, 

 5-10 cm. long, erect, 8-12-seeded. Common in pine woods, Kamiack Butte 

 and Thatuna Hills. 



