BOTANY. 177 
tomously subdivided below the middle, with ovate acute ternate bracts at the forks. Pedicels 
ап inch long. Involucre less than a line in diameter, cleft nearly to the middle into six rather 
obtuse lobes; exterior segments of the perianth nearly four times broader than the inner. , 
Filaments and ovary smooth. Styles short. Achenium smooth. Embryo strongly curved. No 
bracteoles were detected; in their place are only woolly hairs. Resembles E. rotundifolium in 
the flowers; but that species has numeous stems, which branch near the root, even leaves; much 
shorter stout peduncles, and manifest bracteoles. 
EnrogoNUM ROTUNDIFOLIUM, Benth. l. c. Rocky ravines along the Rio Grande from El Paso 
to Santa Barbara, and west to Santa Maria, Cohahuila, April—June. (No. 1765, Wright.) 
Евтовохом cERNUUM, Nutt. Pl. Gamb. in Jour. Acad. Sc. Phil. n. ser. 1, p. 162 ; Benth. l c. 
On the Gila ; Schott. 
ERIOGONUM ABERTIANUM, Torr. in Emory's Hep. р. 151; Benth.l.c. Sandy soils, valley of the 
upper Rio Grande; westward along the Gila, and in Chihuahua. Variable in height and 
breadth of leaves, but always easily recognized. (Nos. 620, 621, 622, 1761, 1762, 1763, Wright.) 
ERIOGONUM PHARNACEOIDES, Torr. in Sitgreave's Rep. p. 167, t. 11; Benth. 1. c. Hills near the 
Copper Mines; Bigelow, Near Janos, Chihuahua; Thurber. 
CHORIZANTHE ANGUSTIFOLIA, Nutt. 4. c.; Benth. l. c. Near Monterey, California, on the sandy 
beach, May ; Parry. 
CHORIZANTHE DIFFUSA, Benth. Pl. Hartw. р. 333, & in DC. Prodr. 1,0. With the last; 
Ратту. 
CHORIZANTHE PROCUMBENS, Nutt. l. c.; Benth. l. е. San Diego, California, May; ‘U"hurber. 
CHORIZANTHE BREVICORNU (n. sp.): annua; foliis radicalibus anguste-spathulatis hirsutis ; 
caulibus subnudis erectis 2-3-chotome ramosis; cymis laxe corymboso-paniculatis ; involucris 
glabriusculis anguste tubulosis, dentibus subequalibus subulato-aristatis recurvis tubo triplo- 
brevioribus, perigonii laciniis integris acutiusculis equalibus. On the Gila River, March ; 
Parry,; also collected -by Colonel Frémont on the same river. Plant 1-4 inches high. 
Leaves scarcely a line wide, rather acute. Bracts subulate.  Involucre about 3 lines 
long, a little curved, the teeth scarcely uncinate. Stamens only 3 in all the specimens examined. 
Near C. staticoides, but with a much looser inflorescence, shorter involucral teeth, equal perianth- 
segments and only 3 stamens. | 
CHORIZANTHE FIMBRIATA, Nutt. l. c.; Benth. l. с. Torr. іп Рас/. Е. Road рэн, v. 362, t. 8. 
** Dry hills around San Diego, California, in such profusion as to give them a red appearance ;” 
Thurber. z 
ACANTHOGONUM RIGIDUM, Torr. in Bot. Whippl. Hep. p. 133, (4 іп Bot. Parke's Bep. t 220 
Desert west of the Colorado, California, March ; Schott. 
/ 
MucRoNEA CaLrronNICA, Benth. in Linn. Trans. 17, p. 419, t. 20, din DC. l.c. p. 27. Dry 
hills near San Diego, California; Parry. In our specimens the involucres are all 3-4-toothed. 
CENTROSTEGIA THURBERI, Gray, in DC. Prodr. 1. c. p. 27; Torr. in Bot. Parke's Вер. T, p. 19, 
1.8. Sandy hills near San Felipe, California, Мау; Thurber, Antisell. 
PTEROSTEGIA DRYMARIOIDES, Fisch. & Mey. Ind. 2, Sem. Hort. Petrop. р. 48; Benth. 1. с. San 
Pasqual, and Napa, California, Мау; Thurber. Mr. Thurber’s specimens from Napa resemble 
those collected by Dr. Bigelow near San Gabriel, in which the leaves are 2-cleft with variously 
cut segments. 
RUMEX HYMENOSEPALUS (n. sp.): glaberrimus; foliis ovato-lanceolatis basi angustatis margine 
subundulatis ; panicula aphylla, racemis elongatis erectis, verticillis approximatis multifloris ; 
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