204 ; | BOTANY.. 
OnosmopiuM THuRBERI, Gray, Syn. Fl. p. 205. . (Macromeria viridiflora, 
Torr. in Mex. Bound. Surv. p. 139, not of A. DC.)—Stem erect, 2 to 8 feet 
high hispid with spreading hairs; leaves ovate-lanceolate, 2 to 34 inches 
long, 6 to 12 lines wide, covered on both sides with a close appressed pubes- 
cence, hispid also on the upper side with stiffish, erect hairs arising from a 
callous base, and on the under side with softer, somewhat villous hairs, 
especially on the rib-like nerves, sessile and partly clasping; flowers one 
inch and a half long, tubular-funnelform, greenish and very hairy on the 
outside, yellow within; calyx about one-fourth the length of the corolla, 
the divisions much elongated in fruit; stamens at first included, but at 
length exserted; nutlets ovate, more than a line long, smooth and shining. 
Willow Spring, Arizona, 1874, Rothrock (227). 
CONVOLVULACE. 
Ipoma@a HEDERACEA, Jacq. Gray, Syn. Fl. part 1, p.210. (Ipomea Nil, 
Roth.)—Southern Arizona (505, 524), where it forms dense masses, often 
an acre in area. 
Tromaa Mexicana, Gray, Syn. Fl. part 1, p. 210. (Zpomea Nil, var. 
diversifolia, Choisy in DC. Prod. ix, p. 343. Pharbitis diversifolia, Lindl. 
Bot. Reg. t. 1988 )—Probably only a form, distinguished (so far as my 
specimen shows) by its shorter, broader calyx-lobes, and also, on authority 
of Choisy, by the lower leaves being cordate-acuminate, and the others 
3-lobed.—Arizona (150 a, Loew). 
Ipoma@a muricaTa, Cav.—Nearly smooth, with a tuberose root; stem 
prostrate; leaves deeply palmately-parted, the 6-8 divisions narrowly 
linear, but slightly dilated upward, 4-9’ long, petiole 1 long; corolla 
12-14” long, purple, tube slender; sepals ovate or lance-ovate, obtuse or 
slightly mucronate, evidently muriculate on the back. he slender stems 
hardly a foot long; flowers infundibuliform and somewhat disproportion- 
ately large—Sanoita Valley, Arizona (623). 
Ipoma@a costet.ara, Torr.—Herbaceous, smoothish or somewhat hairy, 
branching, slender ; leaves palmately-parted, 5-7 divisions, which are linear 
to lanceolate-spatulate, and sometimes sparingly ciliate, 4-7’ long; petioles 
2-5" long; pedicels slightly thickened; flowers purple or whitish, funnel- 
