CATALOGUE. 9 1 



half to an inch long: flowers purple or rose-colored, half an inch long, 

 sessile in close heads, involucrate : involucre deeply lobed, the lobes laci- 

 niately and sharply toothed: calyx-teeth thin, long and narrow, entire: 

 ovules mostly 5 or 6. — Var. heteeodon, Watson (Proc. Am. Acad, viii, 1 30), 

 with usually larger heads and broader leaflets ; some of the calyx-teeth 

 setaceously cleft. — A very common species west of the Rocky Mountains, 

 ranging from British America to Mexico, the variety nearer the coast. The 

 typical form was collected in the valley of the Upper Arkansas, Colorado, 

 Wolf (176) ; at Santa F^, N. Mex., Rothrock (63) ; in Western New Mexico, 

 Loew ; at Zuni Village, N. Mex., Rothrock (172) ; at Willow Spring, Ariz., 

 Rothrock (229). A form with the small involucre cleft nearly to the 

 base was found in Zuni River Canon (178), and on Mount Graham, Roth- 

 rock (432). 



Trifolium monanthum, Gray (Proc. Am. Acad, vi, 523). — Annual, 

 very slender, low and often dwarf, more or less villous : leaflets obcordate 

 to oblanceolate, mostly retuse : flowers 1 to 4, white or purplish, with a very 

 small 2-3 -parted involucre, much longer than the calyx : calyx-teeth not 

 rigid, subulate, shortly acuminate.- — In the mountains of Nevada, 1871. 



Hosackia* puberula, Benth. (PI. Hartw. 305).— Perennial, herba- 

 ceous, usually a span high or more, canescently puberulent, slender : leaflets 

 3 to 5 upon a short rhachis, linear-oblanceolate, 6 to 9 lines long ; stipules 

 gland-like : peduncles exceeding the leaves, 1-5-flowered, with or without 

 a sessile 1— 5-foliolate bract : flowers half an inch long, yellow : calyx-teeth 

 about equalling the tube : pod nearly straight, an inch long, pubescent, 

 many-seeded. — New Mexico to Arizona ; Rancheria Springs, Loew (119), 

 and Sanoita Valley, Arizona, Rothrock (659). — H. riffida, Benth., is a form 

 with the rhachis of the leaves very short or wanting, and the leaflets 

 usually somewhat broader. 



Hosackia Wrightii, Gray (PL Wright, ii, 42).— Like the last, but the 

 peduncles wanting, the flowers being solitary in the axils upon a short pedi- 



* Hosackia, Dougl.— Calyx- teeth nearly equal. Petals free from the stamens, nearly equal; 

 standard often remote from the rest, ovate or roundish ; keel curved, obtuse or somewhat acutely beaked. 

 Stamens diadelphous; anthers uniform. Pod linear, compressed or nearly terete, sessile, several-seeded, 

 with partitions between the seeds. — Herbaceous or rarely woody, with pinnate 2-many-foliolate leaves; 

 stipules mostly minute and glandlike ; flowers in axillary sessile or pedunculate umbels, yellow, often 

 becoming brownish. 



