182 UNITED STATES AND MEXICAN BOUNDARY. 
up a tuft of spreading or decumbent branches, which are 14-4 inches long, and, when young, 
are densely clothed with a whitish pubescence. Radical leaves an inch or more in length, exclu- 
sive of the petiole, which is about an inch long; in the young state pubescent, with almost 
silky white hairs, but finally smoothish ; cauline leaves similar, but with very short petioles, or 
nearly sessile. Heads about three-fourths of an inch long. Bracts very acute, thin and hyaline, 
entirely without a keel. Sepals somewhat rigid, extremely villous. Filaments united nearly 
to the summit ; the lateral processes often reduced to small teeth, or sometimes almost wanting. 
Style deeply bifid. 
Ғвацснтла FLORIDANA, Mog. l. с. р. 420. Oplotheca Floridana, Nutt, Gen. p. 19; Bart. Рі. 
N. Amer. t. 59. On the Limpio and near Van Horn’s Wells; Bigelow. Presidio del Norte ; 
Parry. May—July. 
FmaurcHiA Drummondin, Mog. l. c. Rio Coleto and near El Paso ; Thurber. Sandy beach of 
the lower Rio Grande, April; Schott. Too near the preceding species, which, again, seeras to 
be scarcely distinct from F. interrupta. 
FRG@LICHIA GRACILIS, Mog. l. c. Oplotheca gracilis, Hook. Ic. sub t. 256.  Alluvions of the 
Rio Grande and at the Copper Mines, August—October ; Bigelow. On the Guadalupe river, 
Texas; Schott. Chihuahua and Sonora; Thurber. A smaller species than the two preceding. 
CHENOPODIACE. 
— TELOXYS CORNUTA, Torr. Bot. Whippl. Exped. p. 129. Hills and rocky places near Santa Rita 
7377 del Cobra, October, (in fruit ;) Bigelow. Some of the specimens are nearly two feet high. 
CHENOPODIUM ALBUM, Linn; Moq. 1. c. p. 71. Doña Ana, New Mexico, Sonora and Chihua- 
hua, April—July ; Thurber. (Nos. 1731 and 1732, Wright.) 
CHENOPODIUM ANTHELMINTICUM, Linn.; Мод. in DC. Prodr. 13, pars 2, p. 13. Various places 
New Mexico and western Texas ; probably introduced. 
Вїлтом Bonvus-Henricus, Reich.; Мод. in РО. 1. с. p. 68. In fertile grassy places near San 
Luis Rey; Parry ; and near San Diego, California; Thurber. Doubtless introduced. from 
Europe. 
OBIONE CANESCENS, Moq. in DC. Prcdr. 13, pars 2, p. 212. Abundant at the foot of San Diego 
Bay, California; Parry. It forms dense thickets, 3-5 feet high. 
OBIONE HYMENELYTRA (Torr. in Bot. Whippl. Exped. p.129, t. 20): caule fruticoso ramosissimo, 
ramis inermibus teretibus ; foliis subdeltoideo-orbiculatis vel basi truncatis grosse acuteque den- 
tatis dense lepidoto-incanis ; floribus dioicis ; bracteis reniformi-orbiculatis membranaceis integer- 
rimis basi coalitis, disco nudo. Desert of the Colorado and on the Lower Gila, in saline soils; . 
Schott. A shrub apparently 2-3 feet high, the branches very crooked and interlaced. Leaves 
1-11 inch in diameter, the margin cut into coarse, more or less acute salient teeth. Male flowers 
in dense glomerules, which are collected into axillary and terminal paniculate spikes. 了 ructi- 
ferous bracts more than one-third of an inch in diameter, reticulately veined, only united at the 
base, the short pedicel tumid and spongy. 
OBIONE ARGENTEA, Mog. Chenop. 16, & in DC. Prodr. l. c. p. 115. Atriplex» argentea, 
Nutt. Gen. 1, p. 198. Valley of the Pecos, September ; Bigelow. Annual; stem much branched 
and at length diffuse, the branches angular and flexuous, nearly smooth. Leaves triangular or 
` somewhat deltoid, subsessile, often nearly entire but usually more or less toothed, membrana- 
ceous, Male flowers in glomerated interrupted terminal spikes ; female flowers in sessile axillary 
ai a اکر م‎ ig is RERUM EGE ھک‎ lacs 
— P]! 
