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). 



Eeiogonum phaenaceoides, Torr. (in Sitgreaves's Rep. p. 167, t. 11 ; 

 Torr. & Gray, 1. 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 1 2-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). 



Choeizanthe eigida, Torr. (Watson, I. c. p. 312). — Nevada or Arizona, 

 1871, 1872, Watson's Report. 



Oxyeia digyna, Campd. (Gray's Man. p. 419). — South Park, Colorado, 

 July, 1873, Wolf (42). 



Rumex occidentalis, Watson, Proc. Am. Acad. 12, p. 253 (R. longi- 

 folius, DC, Watson, I. c. 314). — Twin Lakes and San Luis Valley, Colorado, 

 1873, Wolf (29, 33). 



Rumex salicifolius, Weinm. (Cray'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). 



Polygonum aviculabe, Linn.— Utah, 1871, 1872, Watson's Report; 

 Twin Lakes, Colorado, 1873, Wolf (34, 35). 



Polygonum eeectum, Linn.— Utah, 1871, 1872, Watson's Report; San 

 Luis Valley, Colorado, 1873, Wolf (41). 



Polygonum tenue, Michx., var. latifolium, Engelm. — Mount Craham, 

 Arizona, at 9,000 feet elevation, 1874, Rothrock (758) ; Upper Arkansas, 

 Colorado, 1873, Wolf (39). 



