TrijhUum. LEGUMINOS^. 231 



19. T. monanthum, Gray. Still more slender, one to four inches liigli, usually 

 sparingly villous witli long scattered hairs, decumbent : stipules lanceolate, entire or 

 nearly so ; leaflets obcordate to oblanceolate, one to four lines long, mostly retuse, 

 sparingly toothed : heads 1 - 4-llowered ; involucre very small, 2-3-parted and usu- 

 ally unilateral : flowers 4 to G lines long, white or purplish, much exceeding the 

 short calyx : calyx-teeth subulate, shortly acuminate, thin. — Proc. Aiu. Acad. vi. 

 523. 7'. paucijlorum, var. (?) parvum, Kellogg, Proc. Calif. Acad, v, 54. 



On moist sunny slopes in the Sierra Nevada ; on tlie Upper Tuoliunnc, at 8,900 fcot altitudp, 

 and at tho head of the South Kork of King's Hiver {Brewer) ; Yoscniile VaUcy (Oray) ; at Cisco 

 (Kellogg) ; Lassen's Peak, Lemmoii. Also in tlie mountains of Nevada, IVIiccler. 



* * Involucre membranaceous, at least at base, less deepli/ lobed ; the lobes entire 



or toothed: corolla not becoming inflated. 



20. T. microcephalum, Pursh. Villous with soft hairs, slender, erect or 

 decumbent : stems often a foot or two long : stipules ovate to lanceolate, acuminate, 

 mostly entire ; leaflets oblanceolate to obovate, usually retuse, serrulate : heads 

 small, dense ; involucre about 9-lobed, tho lobes acuminate, 3-nerved, entire : calyx 

 hairy ; its teeth subulato, with a broad scariously margined sometimes toothed base, 

 attenuate to a long spinulose apex, nearly equalling the white or light rose-colored 

 corolla: ovules two : pod globose, 1 -seeded. — Torr. & Gray, Fl. i. 317. 



Common on hillsides and the sandy beds of dry creeks, chiefly in the Coast Ranges, from Puget 

 Sound to Sontliem California ; Guadalupe Island (Palmer) ; Northern Nevada, Watson. 



21. T. microdon, Hook. l<c Arn. Pesembling the last: involucre broader, 

 nearly enclosing the head ; its lobes about 3-toothed : calyx smooth, angled ; the 

 teeth rigid, broadly triangular, acute, with a narrow scarious serrulate margin. — 

 Bot. Beechcy, 330, t. 79 ; Torr. & Gray, Fl. i. 691. 



From about San Francisro northward ; Washington Territory, Lyall, Hall. Also Chilian. 



22. T. cyathiferum, Lindl. Smooth : stems erect or ascending, a foot high 

 or less : stipules ovate to lanceolate, laciniately toothed ; leaflets oblanceolate to 

 obovate, obtuse or acute, a half to an inch long : heads larger ; involucre conspic- 

 uous, very broad and membranaceous, with short many-nerved and toothed lobes : 

 calyx .strongly 5-nerved, membranaceous and somewhat inflated ; the nerves excur- 

 rent above and setaceously branched, equalling the short rose-colored corolla : ])od 

 2-,soeded. — Hot. Reg. xiii, under t. 1070; Hook. Fl. i. 133, I.. 50. 



Hi(MTa Valley, Sierra Co. (Lrvmwii) ; Nortli((rn NevH<la (Andrrsmi, U'ntson) ; and northward to 

 the Columbia River. A remarkable sjteiues. 



* * * Standard becoming conspicuovsly inflated and enclosing the rest of the flower : 



involucre nearly obsolete in, T. depauperatum. 

 +■ Heads mostly large : involucre conspicuous. 



23. T. barbigerum, Torr. Somewhat pubescent : stems rather stout, decum- 

 bent or ascending, a span high or less : stipules scarious, broadly ovate, laciniate ; 

 leaflets obovate or ovate-oblong, obtu.se or retuse, half an inch long or less : invo- 

 lucre as broad as the beads (4 to 8 lines wide), shortly lobed and setaceously many- 

 tootlied : calyx-tube short, membranaceous ; its teeth .setaceou.sly awned, plumose, 

 the lower usually exceeding the purple corolla, sometimes 2-3-parted: pod 2-seeded. 

 — Pacif P. Pep. iv. 79. 



Vai\ Andre'Wsii, (iray, A stout villous form ; the heads larger, sometimes an 

 inch broad : calyx-tccth very long. — Proc. Am. Aend. vii. 335. 

 Near tho coast from Monterey to Mendocino County ; very variable. 



24. T. fucatum, Litidl. Smooth : stems stout and succulent, a foot or two 

 liigii or mow. : stijudcs hirge and scarious, usually very broad and entire ; leaflets 

 obovate, often largo (J to 1^ inches long), obtuse : heads large; involucre broad, 



