OF ARTS AND SCIENCES. 131 



lescent, glabrous, tlie inflorescence slightly villous ; stij)ules scarious ; 

 leaflets ellij)tic-ol)long, thin, acutish, entire, a half to an inch long : 

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

 head, pur[)lish, seven lines long : calyx-teeth lanceolate, acuminate, a 

 little longer than the canipanuhite tube : ovary stipitate, T-ovuled. — 

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

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

 species. 



Tkifolium Brewkki. 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. variegatum, Nutt. T. oUganthum, 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. G. 528. Sierra Nevada. 



t- t- Involucre membranaceous, at least at base, less deeply lobcd ; lobes entire 

 or serrate. 



33. T. MiCROCEPHALUM, 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 3toothed : 

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

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



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

 lobes sliort, 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. 



•*- Heads mostly large : involucre conspicuous. 



36. T. BARBiGERCM, 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. FtrCATUM, 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-cIeft. — T. Gamhellii, Nutt. PI. Ganib. 151. 



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

 subulate : small. 



38. T. DEPADPERATUM, Desvaux. Involucre a very small toothed or trun- 

 cate often scarious ring. — T. stenophijllum, Nutt. 1. c. Also Chilian. 



39. T. AMPLECTEKS, Torr. & Gray. Involucre 4-5-parted or cleft, the seg- 

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

 diver sifoUum, Nutt. 1. c. 152. 



