CATALOGUE. 91 
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. HETERODON, Watson (Proc. Am. Acad. viii, 130), 
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 Fé, 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 Cafion (178), and on Mount Graham, Roth- 
rock (432). 
TrRIFOLIUM 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. (Pl. 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. rigida, Benth., is a form 
with the rhachis of the leaves very short or wanting, and the leaflets 
usually somewhat broader. ; 
: Hosacxia Wricutu, Gray (Pl. Wright. ii, 42)—Like the last, but the 
peduncles wanting, the flowers being solitary in the axils upon a short pedi- 
ete —— ~Calyxt — —y. — Petals free from the stamens, nearly equal; 
standard oft ; keel curved, obtuse or somewhat acutely beaked, 
Stamens diadelphous; anthers uniform. Pod linear, compreseed 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. 
