CATALOGUE. 231 
less peduncled, many-flowered, deeply 5- to 8-cleft, lobes foliaceous; calyx 
petaloid, glabrous, rose-colored, outer segments rounded, deeply cordate, 
becoming nearly 2 lines long, the inner linear-oblong, retuse—Cottonwood, 
Arizona, at 4,750 feet elevation, July, 1874, Rothrock (355). 
ERI0GONUM PHARNACEOIDES, Torr. (in Sitgreaves’s Rep. p. 167, t. 11; 
Torr. & Gray, /. c. p. 189).—Pubescent, very slender, effusely panicled, 1 
foot high; internodes elongated; cauline leaves narrow-linear, sometimes 
revolute on the margins, hoary-tomentose beneath, becoming glabrous 
above, about 1 inch long; pedicels capillary, smooth, 1 to 2 inches long; 
involucres 5- to 8-cleft, 8- to 12-flowered, bracteoles filiform, villous; calyx 
petaloid, glabrous, white or rose-colored, outer segments broadly ovate, 
concave, in fruit bi-gibbous at base, the inner longer, oblong-linear, retuse ; 
anthers dark.—Arizona, 1873, Loew (154 a). Var.—Taller, 12 to 18 inches 
high, softly villous-pubescent throughout; branches much stouter and erect; 
lower leaves ovate-lanceolate; heads and flowers larger—Sanoita- Valley, 
at 5,850 feet elevation, September, 1874, Rothrock (664). 
CHORIZANTHE RiGIDA, Torr. (Watson, J. c. p. 312).—Nevada or Arizona, 
1871, 1872, Watson’s Report. : 
OxyrIA vigyna, Campd. (Gray’s Man. p. 419).—South Park, Colorado, 
July, 1873, Wolf (42). 
Rumex occientauis, Watson, Proc. Am. Acad. 12, p. 253 (R. longi- 
folius, DC., Watson, /. c. 314).—Twin —_ and San Luis Valley, Colorado, 
1873, Wolf (29, 33). 
Rumex sauicrrotius, Weinm. (Gray’s Man. p. 420).—San Luis Valley, 
Colorado, 1873, Wolf (31). Var. with lance-ovate leaves and inner valves 
of the calyx larger and broad-cordate, Cienega, Arizona, August, 1874, 
Rothrock (564). 
Potycgonum avicuLaRE, Linn.—Utah, 1871, 1872, Watson’s Report; 
Twin Lakes, Colorado, 1873, Wolf (34, 35). 
Potygonum erectum, Linn.—Utah, 1871, 1872, Watson’s Report; San 
Luis Valley, Colorado, 1873, Wolf (41). 
PotyGonum TENUE, Michx., var. LATIFOLIUM, Engelm.—Mount Graham, 
Arizona, at 9,000 feet elevation, 1874, Rothrock (758); Upper Arkansas, 
Colorado, 1873, Wolf (89). 
