PIPER FLORA OF THE STATE OF WASHINGTON. 349 



Zonal distribution: Humid Transition. 



Allen's 59 is considered a distinct subspecies by Professor Greene, Osmaronia cerasiformis 

 nigra,a based principally upon the drupes which seem to lack the usual glaucous coating. 



FABACEAE. Bean Family. 



Stamens 5, monadelphous ; leaves pinnate Petalostemum (p. 350). 



Stamens 10. 



Filaments distinct; leaves trifoliolate Thermopsis (p. 349). 



Filaments united, either monadelphous or diadelphous, 9 and 1 . 

 Anthers of two forms, round and oblong. 



Leaves digitate with 5 to 11 leaflets; ours herbs. . . Lupinus (p. 350). 



Leaves with solitary leaflets; spiny shrub. Ulex (p. 358). 



Anthers all alike. 



Leaves digitate, or if pinnate then trifoliolate. 



Pods curved or coiled; flowers in spikes Medicago (p. 363). 



Pods straight. 



Flowers in long racemes Melilotus (p. 358). 



Flowers in heads or head-like umbels Trifolium (p. 358). 



Leaves pinnate; leaflets mostly more than 3; no ten- 

 drils. 



Herbage dotted with conspicuous glands. 



Leaflets 3; pods not spiny Psoralea (p. 363). 



Leaflets many ; pods spiny Glycyrrhiza (p. 364). 



Herbage not dotted with conspicuous glands. 

 Leaves unequally pinnate, not tendril bear- 

 ing. 



Flowers umbellate or solitary; pods 



linear Hosackia (p. 364). 



Flowers spicate or racemose, rarely 

 solitary, then pods not linear. 



Pod a loment Hedysarum (p. 366). 



Pod not a loment. 



Keel of the corolla acute or 



subulate at apex Aragallus (p. 367). 



Keel of the corolla obtuse at 



apex Phaca (p. 367). 



Leaves abruptly pinnate, usually tendril- 

 bearing. 



Style filiform, haiiy only near the tip. . Vicia (p. 374). 

 Styleflattened,hairy on the inner side. Latiiyrus (p. 375). 



THERMOPSIS. 



1. Thermopsis montana Nutt.; Torr. & Gr. Fl. 1: 388. 1840. 



Type locality: "High valleys of the Rocky Mountains, in bushy places by streams, near 

 the line of Upper California." Collected by Nuttall. 



Range: Washington to Montana and Arizona. 



Specimens examined: Walla Walla region, Brandegee 695. 



This or the following was referred to T. fabacea (Pall.) DC-, by Hooker. b 



la. Thermopsis montana ovata Robinson, subsp. nov. 

 Leaflets broader than in T. montana, ovate. 

 Range: North Idaho and adjacent Washington and Oregon. 



o Greene, Pittonia 5: 309. 1905. b Fl. Bor. Am. 1 : 128. 1838. 



