OF ARTS AND SCIENCES. 131 



lescent, glabrous, the inflorescence slightly villous : stipules scarious ; 

 leaflets elliptic-oblong, thin, acutish, entire, a half to an inch long : 

 peduncles about equalling the leaves : flowers spicate in a loose naked 

 head, purplish, seven lines long : calyx-teeth lanceolate, acuminate, a 

 little longer than the campanulate tube : ovary stipitate, 7-ovuled. — 

 On the north-western border of New Mexico; collected by T. S. 

 Brandegee, on Hayden's Survey. A strongly marked and peculiar 

 species. 



•^ Trifolium Breweri. Annual, very slender and diffuse, some- 

 what pubescent throughout, a span high or more : stipules lanceolate, 

 short ; leaflets obcordate or obovate, rarely oblong, toothed or serru- 



T. vnriegatum, Nutt. T. oliganthum, Steud. Washington Territory to S. Cali- 

 fornia and Utah. 



32. T. MONANTHUM, Gray. Often villous, small, very slender : involucre 

 very small : flowers 1 to 4, much exceeding the short calyx : teeth thin, shortly 

 acuminate. — Proc. Am. Acad. 6. 523. Sierra Nevada. 

 ■I- -1- Involucre membranaceous, at least at base, less deeply lobedj lobes entire 



or serrate. 



X 33. T. MiCROCEPHAi.uM, Pursh. Villous : heads small : lobes of involucre 

 acuminate, 3-nerved, entire : calyx-teeth long-subulate, with broad scarious mar- 

 gin. — Washington Territory to S. California, and N. Nevada. 



^ 84. T. MiCRODON, H. & A. Villous: involucre broader; lobes 3-toothed : 

 calyx smooth, angled ; teeth rigid, triangular, acute, with a narrow serrulate 

 scarious margin. — Washington Territory to San Francisco; Chih. 



35. T. CTATHiFERUM, Lindl. Smooth : heads larger : involucre very broad ; 

 lobes short, toothed, many-nerved : calyx-teeth setosely many -branched: — From 

 the Columbia River to N. California and N. Nevada. 



* * * Slender annuals : standard becoming conspicuously inflated. — Cali- 

 fornia. 



-t- Heads mostly large : involucre conspicuous. 



"' 36. T. BARBiGERUM, Torr. Somewhat villous : involucre shortly lobed, 

 setaceously many-toothed : calyx-teeth filiform, plumose, sometimes 2-3-parted. 

 — Pacif. R. Rep. 4. 79. Monterey to Mendocino County. 



" 37. T. FUCATUM, Lindl. Smooth, stout : stipules large and scarious : heads 

 large : involucre deeply lobed or parted ; lobes entire, acuminate : teeth nar- 

 rowly subulate, entire or 2-3-cleft. — T. Gambellii, Nutt. PI. Gamb. 151. 



-1- -1- Heads small, few-flowered : involucre small or none : calyx-teeth narrowly 

 subulate: small. 



"^ 38. T. DEPADPERATUM, Dcsvaux. Involucre a very small toothed or trun- 

 cate often scarious ring. — T. stenophi/llum, Nutt. 1. c. Also Chilian. 

 •■ 30. T. AMPi-ECTENS, Torr. & Gray. Involucre 4-5-parted or cleft, the seg- 

 ments oblong, usually obtuse, entire or nearly so, equalling the calyx. — T. 

 diversifolium, Nutt. 1. c. 152. 



