182 UNITED STATES AND MEXICAN BOUNDARY. 





up a tuft of spreading or decumbent brandies^ wliicb are 1^-4 inches long, and^ when young, 

 are densely clothed with a whitish pubescence. Radical leaves an inch or more in length, exclu- 

 sive of tlie petiole^ which is about an inch long ; in the young state puhescent, with almost 

 silky white hairs, hut 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. Tilaments united nearly 

 to the summit ; the lateral processes often reduced to small teeth, or sometimes almost wanting. 

 Style deeply bifid. 



Frcelichia Flobidana, Moq 



N, Amer. t. 59. On the Liir 

 Parry. May — July. 



lotheca Floridana, Nutt. Gen. p. 79 ; Barf. Ft 

 Horn's Wells : Biaeloiv. Presidio del Norte 



Fkgelichia Dkumsiondii, 3Ioc[. I. c. Eio Coleto and near El Paso ; TJmrher. Sandy beach of 

 the lower Rio Grande, April ; Schott, Too near the preceding species, which, again, seems to 

 be scarcely distinct from F. interrupta. 



Frcelichia aRACiLis, Moq.l. c. Oplotheca gracilis, Hooh. Ic. sub t. 256. Alluvions of the 

 Eio Grande and at the Copper Mines, August — October ; Bigeloio. On the Guadalupe river, 

 Texas ; Schott. Chihuahua and Sonora ; Thurher, A smaller species than the two preceding. 



CHENOPODIACE^. 



Teloxys cornuta, Torr. Bot. Whippl. Exped. p, 129. Hills and rocky places near Santa Rita 

 del Cobra, October, (in fruit ;) Bigeloiu. Some of the specimens are nearly two feet high. 



Chenopodium album, Linn; Moq. I. c.p, 71. Dona Ana, New Mexico, Sonora and Chihua- 

 hua, April— July ; Thurber. (Nos. 1Y31 and 1732, Wright.) 



Che:n^opodium ai^'thelminticum, Linn,; Moq. in DG. Prodr. 13, ^ars 2,^, 73. Various places 

 New Mexico and western Texas ; probably introduced. 



Blitum Bonus-Henricus, Meich.; Moq. in DG. I. c. p. 68. In fertile grassy places near San 

 Luis Rey ; Parry ; and near San Diego, California ; Thurber. Doubtless introduced from 

 Europe. 



Obionecanescens, Moq. in DG. 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 hymenelttra {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— li 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. Fructi- 

 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 ARGE^'TEA, Moq. Chenop. 76, d: in DG. Prodr. I. 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 

 ceous. Male flowers in irlomerated interrupted terminal spike 



more 



membrana- 



i 





