PEA FAMILY 553 



1. Lotus corniculatus L. Bird's-foot Trefoil. Fig. 2749. 



Lotus corniculatus L. Sp. PI. 775. 1753. 



Perennial from an elongated root, appressed-pubescent or glabrate, the stems slender, decum- 

 bent or ascending, 10—50 cm. long. Leaves 3-foliolate, short-petioled ; leaflets obovate to oblong, 

 6-15 mm. long, obtuse or acute; stipules resembling the leaflets, and nearly as large; peduncles 

 about 1 cm. long; umbels 3-12-flowered ; calyx-lobes equaling or shorter than the tube; corolla 

 12-18 mm. long, bright yellow or the standard reddish ; pod linear, 20-25 mm. long. 



Waste places and on ballast, Portland, Oregon. Type locality: Europe. June. 



Lotus angustlssimus L. Sp. PI. 774. 1753. (Slender Lotus.) Annual, branching from the base and pros- 

 trate, villous. Leaflets 5, lanceolate, 5-7 mm. long, the two lower simulating stipules; flowers solitary or in pairs 

 on slender axillary bibracteate peduncles, yellow, 4 mm. long; calyx-teeth nearly as long as the corolla. Natural- 

 ized along the coast of Sonoma and Mendocino Counties, California. Native of Europe. 



11. PSORALEA [B. Juss.] L. Sp. PI. 762. 1753. 



Herbs or shrubs, heavy-scented with dark glands or pellucid dots. Leaves alternate, 

 1-5-f oliolate ; stipules large. Flowers mainly in pedunculate spikes or racemes, purple, 

 blue, pink or white. Calyx-lobes nearly equal, or the lower longer, the upper sometimes 

 united. Petals distinct from the stamen tube ; standard ovate to orbicular, clawed ; wings 

 oblong or falcate; keel obtuse, incurved. Stamens monadelphous or diadelphous. Ovary 

 sessile or short-stipitate, 1-ovuled. Pod ovoid, indehiscent. [Name Greek, meaning 

 scurfy, from the glandular dots.] 



About 120 species of wide geographic distribution. Type species, Psoralea pinnata L. 



Leaves 3-foliolate; pods indehiscent; plants from rootstocks. 

 Leaves pinnately 3-foliolate. (Hoita) 

 Stems erect. 



Calyx-teeth short, subequal; corolla ochroleucous or whitish with a purple-tipped keel. 



Leaflets broadly ovate; calyx inflated in fruit, the lobes 1-2 mm. long. 1. P. physodes. 



Leaflets lanceolate-ovate, firm; calyx not inflated in age, the lobes 3-5 mm. long. 



2. P. rigida. 



Calyx distinctly irregular, the lower lobe much longer than the others and separated from them by 

 a deeper sinus. 

 Inflorescence well exceeding the leaves; corolla 8-10 mm. long; stipules lanceolate-subulate. 



3. P. macrostachya. 



Inflorescence shorter than the leaves or barely equaling them; corolla 15 mm. long; stipules 



ovate-lanceolate. 4. P. strobilina. 



Stems prostrate; leaves and flowers erect, long-stalked. 5. P. orbicularis. 



Leaves palmately 3-foliolate. (Psoralidium) 6. P. lanceolata scabra. 

 Leaves 4-5-f oliolate, palmate, or the central leaflet sometimes petiolulate; plants subacaulescent from a deep- 

 rooted fusiform root; pods dehiscent. (Pcdinmcium) 



Lower calyx-lobe not conspicuously larger than the others; seeds smooth. 7. P. californica. 



Lower calyx-lobe much larger than the others; seeds reticulate. 8. P. castorea. 



1. Psoralea physodes Dougl. California Tea. Fig. 2750. 



Psoralea physodes Dougl. ex Hook. Fl. Bor. Amer. 1: 136. 1831. 

 Lotodes physodes Kuntze, Rev. Gen. PI. 194. 1891. 

 Hoita physodes Rydb. N. Amer. Fl. 24: 8. 1919. 



Perennial, with a creeping rootstock ; stems erect, 3-8 dm. high, glabrous or sparsely pubes- 

 cent with mostly black hairs, prominently striate and grooved. Petioles 2-5 cm. long; leaflets 

 ovate to broadly ovate-rhombic, 2-6 cm. long, sparsely puberulent and rather minutely punctate- 

 glandular, mucronulate; peduncles 3-10 cm. long, sparsely pubescent; racemes dense, 15-25 mm. 

 long; rachis and pedicels villous-pubescent with black hairs; calyx glandular-dotted and pubes- 

 cent with black and whitish hairs, conspicuously enlarged in fruit, the tube 4 mm. long in flower 

 and 6-7 mm. in fruit; lobes triangular, acuminate, shorter than the tube; corolla 10-12 mm. 

 long, ochroleucous, the keel purple-tipped, standard oblanceolate ; pod 6 mm. long, compressed- 

 ovoid. 



Open forests, Upper Sonoran and Transition Zones; Vancouver Island and eastern Washington to southern 

 California. Type locality: Great Falls of the Columbia, Washington. April-June. 



2. Psoralea rigida Parish. Parish's Psoralea. Fig. 2751. 



Psoralea rigida Parish, Bull. Torrey Club 19: 91. 1892. 

 Hoita rigida Rydb. N. Amer. Fl. 24: 9. 1919. 



Perennial from a rootstock, the stems erect, 3-6 dm. high, rather sparsely puberulent, spar- 

 ingly glandular-dotted with sessile or slightly raised glands. Stipules lanceolate-subulate, 1 cm. 

 long; petioles 2-4 cm. long, sparsely puberulent or glabrate, glandular-dotted; leaflets ovate- 

 lanceolate, acute, or those of the lower leaves ovate, glandular-punctate, glabrous above, spar- 

 ingly pubescent beneath, 3-10 cm. long, subcoriaceous ; peduncles 3-7 cm. long ; racemes dense, 

 2-3 cm. long; bracts lanceolate, acuminate, 4-5 mm. long, white-pubescent, more or less per- 

 sistent ; calyx short-pubescent, conspicuously punctate-glandular ; tube 4-5 mm. long, the lowest 

 lobe 5 mm. long, a little exceeding the others ; corolla 10-12 mm. long, ochroleucous with purple- 

 tipped keel ; standard oblanceolate. 



Dry hillsides, Upper Sonoran and Arid Transition Zones; mountains of San Diego County, California. 

 Type locality: Oak Grove, California. June-July. 



