482 FABACEAE 



usually large foliaceous stipules. Flowers large, yellow or purple, in terminal racemes. 

 Calyx campanulate, the teeth equal or the two upper ones united. Standard nearly orbicu- 

 lar, equaling the oblong wings, the keel nearly straight. Stamens 10, distinct. Ovary 

 sessile or short-stipitate ; ovules many ; style incurved ; stigma terminal, small. Pod linear 

 or oblong, usually flat, straight or incurved. [Name Greek, meaning lupine-like.] 



About 20 species, natives of North America and northern and eastern Asia. Type species, Thermopsis 

 lanceolata (Willd.) R. Br. 



Stems glabrous or nearly so. 



Leaves ascending, the leaflets oblong-lanceolate; raceme dense. 1. T. montana. 



Leaves spreading, the leaflets elliptic-oblong to obovate; raceme often loose. 2. T. gracilis. 

 Stems villous-tomentose or silky. 



Herbage more or less densely tomentose with spreading or matted hairs. 3. T. tnacrophylla. 



Herbage silvery-strigose. 4. T. argentata. 



1. Thermopsis montana Nutt. Rocky Mountain Thermopsis or False Lupine. 



Fig. 2555. 



Thermopsis montana Nutt. in Torr. & Gray, Fl. N. Amer. 1: 388. 1840. 

 Thermopsis stricta Greene, PI. Baker. 3: 34. 1901. 

 Thermopsis angustata Greene, PI. Baker, loc. cit. 



Stems usually stout, 4-7 dm. high, simple or branched above, glabrous or nearly so. Stipules 

 broadly lanceolate to linear-lanceolate, 2-5 cm. long; leaflets linear-lanceolate to oblanceolate, 

 3-5 cm. long, glabrous above, sparsely pubescent beneath ; racemes rather loosely flowered, 5-20 

 cm. long; calyx-teeth much shorter than the tube, triangular-subulate; pods erect, straight, 

 4-6 cm. long, 10-12-seeded. 



Meadows, Transition and Canadian Zones; eastern Washington and Montana to eastern Oregon, Nevada, 

 Utah, and Colorado. Type locality: "high valleys of the Rocky Mountains, in bushy places by streams near the 

 line of Upper California." May-July. Golden Pea. 



2, Thermopsis gracilis Howell. Slender Thermopsis or False Lupine. Fig. 2556. 



Thermopsis gracilis Howell, Erythea 1 : 109. 1893. 



Thermopsis montana ovata Robinson, Contr. U.S. Nat. Herb. 11: 349. 1906. 



Thermopsis venosa Eastw. Bull. Torrey Club 32: 198. 190S. 



Stems stout, 5-10 dm. high, glabrous or nearly so and somewhat glaucous, slightly branched 

 above. Stipules ovate to lanceolate, 2-5 cm. long ; leaflets oval to obovate, mostly obtuse, 3-7 cm. 

 long, glabrous above, somewhat pubescent beneath ; raceme rather loosely flowered, 6-12 cm. 

 long ; calyx-teeth triangular, shorter than the tube ; standard much shorter than the wings and 

 keel ; pods straight and erect in fruit. 



Meadows, Transition Zone; British Columbia and western Montana to the Siskiyou Mountains, and Humboldt 

 County, California. Type locality: mountains of southwestern Oregon from the sources of the Willamette River 

 to northern California. April-July. 



3. Thermopsis macrophylla Hook. & Arn. California Thermopsis or 



False Lupine. Fig. 2557. 



Thermopsis macrophylla Hook. & Arn. Bot. Beechey 329. 1836. 

 Thermopsis californica S. Wats. Proc. Amer. Acad. 11: 126. 1876. 

 Thermopsis robusta Howell, Erythea 1: 109. 1893. 

 Thermopsis velutina Greene, Erythea 3: 19. 1895. 



Stems usually stout, 4-8 dm. high, more or less villous-tomentose with spreading hairs. 

 Stipules ovate to ovate-lanceolate, 2-4 cm. long ; leaflets 3-6 cm. long, obovate to oblanceolate, 

 rounded or obtuse at the apex, usually rather sparsely villous-tomentose on both surfaces; 

 raceme rather dense, 6-15 cm. long; calyx-teeth triangular-lanceolate, shorter than the tube; 

 standard nearly as long as the wings and keel ; pod straight, erect, 2-5-seeded. 



Wooded slopes or meadows, mainly Transition Zone; southern Oregon to southern California. Type locality: 

 California Coast Ranges. April-June. 



4. Thermopsis argentata Greene. Silvery Thermopsis or False Lupine. 



Fig. 2558. 



Thermopsis argentata Greene, Erythea 3: 18. 1895. 



Stems rather slender, 3-6 dm. high, the whole plant especially when young silvery-canescent 

 with a dense minute silky pubescence. Stipules 2-4 cm. long, broadly to narrowly lanceolate ; leaf- 

 lets of the lower leaves narrowly cuneate-obovate, 3-5 cm. long, those of the upper sometimes 

 narrower and acute ; racemes 8—12 cm. long, rather loosely flowered ; calyx-teeth triangular-subu- 

 late, about equaling the tube ; wings and keel longer than the standard ; pods erect, about 4 cm. 

 long, silky-pubescent, 5-8-seeded. 



Moist soils. Transition Zone; northeastern California in Modoc and Shasta Counties; specimens also from 

 Mount Pinos, Ventura County, seem to belong here. Type locality: Forestdale, Modoc County, California. May- 

 July. 



2. PICKERINGIA Nutt. in Torr. & Gray, Fl. N. Amer. 1 : 389. 1840. 



Shrub with smooth green bark and stiff spine-tipped branches. Leaves usually sparse, 

 giving a broom-like appearance to the plant, small, 1-3-foliolate; stipules none. Flowers 



