546 



FABACEAE 



to elliptical, 3-10 mm. long; peduncles usually longer than the leaves; bracts 3-foliolate; umbels 

 1-flowered ; calyx-tube 1 mm. long, longer than the subulate teeth ; corolla 4-5 mm. long, cream- 

 white, tinged with rose; pods 15-20 mm. long, 2 mm. wide, constricted between the seeds; seeds 

 ovoid, smooth. 



Grassy slopes, Transition and Upper Sonoran Zones; British Columbia south, west of the Cascade Mountains 

 and Sierra Nevada, to southern California. Type locality: "North-west coast of America," collected by Douglas. 

 April-June. 



23. Hosackia americana (Nutt.) Piper. Spanish Clover. Fig. 2732. 



Trigonella americana Nutt. Gen. 2: 120. 1818. 

 Hosackia Purshiana Benth. Bot. Reg. 15: under pi. 1257. 1829. 

 Lotus americanus Bisch. Del. Sem. Hort. Heidelb. 1839. 

 Hosackia americana Piper, Contr. U.S. Nat. Herb. 11: 366. 1906. 



Annual, stems erect, branching, 2-6 dm. high, whole plant villous-pubescent or glabrate. 

 Leaves 3-foliolate, sessile or the lowest petioled; leaflets oblong-lanceolate to elliptical, 10-15 

 mm. long, the terminal petiolulate; peduncles 10-15 mm. long, slender; bract 1-foliolate; flower 

 solitary ; calyx 3-4 mm. long, the subulate lobes twice as long as the tube ; corolla white tinged 

 with rose, 4-7 mm. long ; pod 20-25 mm. long, deflexed, glabrous ; seeds broadly oblong, black, 

 smooth. 



Open woods and grassy slopes, Upper Sonoran and Transition Zones; British Columbia to Dakota, south to 

 northern Mexico and Lower California. Type locality: "On the banks of the Missouri." May-Oct. 



A variable species, and several segregates have been proposed, the most extreme of which is a small-flowered 

 (2-3 mm. long) form usually confined to the Arid Transition Zone. 



24. Hosackia tomentosa Hook. & Arn. Woolly Hosackia. Fig. 2733. 



Hosackia tomentosa Hook. & Arn. Bot. Beechey 137. 1832. 

 Syrmatium tomentosum Vogel, Linnaea 10: 591. 1836. 

 Lotus tomentosus Greene, Pittonia 2: 150. 1890. 

 Lotus eriophorus Greene, Erythea 1 : 207. 1893. 

 Syrmatium eriophorum Heller, Muhlenbergia 9: 67. 1913. 



Perennial from a taproot, the branches numerous, slender, prostrate, forming a mat, leafy, 

 villous-tomentose throughout. Leaflets 3-5, 5-12 mm. long, obovate to cuneate-oblong, more or 

 less densely villous-tomentose; peduncles 2-8 mm. long; umbels 5- to many-flowered, bracteate; 

 calyx densely villous, 4-5 mm. long, the teeth setaceous, equaling the tube ; corolla 6 mm. long, 

 yellow with red wings ; pod 2-seeded, pubescent, 7-8 mm. long, the beak very slender, as long as 

 the body, hooked. 



Usually sandy soil near the coast, Transition and Sonoran Zones; Sonoma County, California, to northern 

 Lower California. Type locality: Monterey, California. March-Oct. 



Hosackia tomentosa subsp. glabriuscula (Hook. & Arn.) Abrams. (.Hosackia decumbens var. glabriuscula 

 Hook. & Arn. Bot. Beechey 137. 1832; Hosackia Heermannii Dur. & Hilg. Journ. Acad. Phila. II. 3: 39. 

 1855.) Villous when young but soon glabrous or nearly so; corolla 4—5 mm. long. Sandy soils, washes and em- 

 bankments, Sonoran Zones; San Luis Obispo County, California, south to northern Lower California. Type 

 locality: Tejon Pass, Tehachapi Mountains, California. 



25. Hosackia juncea Benth. Rush Hosackia. Fig. 2734. 



Hosackia juncea Benth. Trans. Linn. Soc. 17: 366. 1837. 

 Syrmatium junceum Greene, Bull. Calif. Acad. 2: 147. 1886. 

 Lotus junceus Greene, Pittonia 2: 148. 1890. 

 Lotus Biolettii Greene, Pittonia 2: 222. 1890. 



Perennial, the stems slender, numerous from the crown of a woody root, suffrutescent, much 



2720 

 2720. Hosackia leucophaea 



2721 

 2721. Hosackia rigida 



2722 



2722. Hosackia Wrightii 



