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BOTANY. 



177 



, ^ tomously subdivided below the middle^ with ovate acute ternate bracts at the forks. Pedicels 



" an inch long. Involucre less than a line in diameter^ cleft nearly to the middle into six rather 



obtuse lobes ; exterior segments of the j^erianth 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 nuraeous stems, which branch near the root, even leaves; much 



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shorter stout peduncles, and manifest bracteoles. 



Erioqonum 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.) 



Eriooonum cerxuum, Nutt. PL Gamh. in Jour. Acad, Sc. Phil. n. ser, 1, />. 1G2 ; Beiith. I. c. 

 On the Gila ; Schoit. 



Eriogonum Abertianum, Torr. in Emory's Rep. p. 151 ; Bentli. I. 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. G20, 621, 622, 17G1, 1762, 1763, WrighL) 



EkiogonUxM piiarnaceoides, Torr. in Sitgreave's Rep. p. 167, t. 11 ; Benth. h c. Hills near the 

 Copper Mines ; Bigelow. Near Janos, Chihuahua ; Thurher. 



Chorizantiie angustifolia, Nutt. L c.; Benth, L c. Near Monterey , California, on the sandy 

 beach, May ; Parry. 



Chorizanthe diffusa, Bentli. PI. Harttv. p. 333, & in DQ. Prodr. I. c. With the last ; 

 Parry. 



Chorizanthe PROCUMBEXS, Nutt. I. c; Benth. I. c. San Diego, California, May; Thurber. 

 Chorizanthe brevicobnu (n. sp.): annua; foliis radicalibus anguste-spathulatis hirsutis ; 

 caulibus subnudis erectis 2-3-chotorae ramosis ; cymis laxe corymboso-paniculatis ; involucris 

 j; glabriusculis anguste tubulosis, dentibus suba}C[ualibus subulato-aristatis recurvis tubo triplo- 



brevioribus , perigonii laciniis integris acutiusculis a^qualibus. On the Gila River, March; 

 Parry ^ ; also collected by Colonel Fremont on the same riv^er. 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- 

 1 segments and only 3 stamens. 



Chorizanthe fimbriata, Nutt. I. c; Benth. I. c. Torr. in Pacif. R. Road Expl. 6,^. 362, t. 8. 

 '^Dry hills around San Diego, California, in such profusion as to give them a red appearance ;" 



Thurher. 



Acanthogonum rigidum, Torr. in Bot. Whippl. Rep. p. 133, cfe in Bot. Parke's Rep, t. 8. 



* 



Desert west of the Colorado, California, March; Schott. 



MucRONEA Californica, Bentli. in Linn. Trans. 17, p. 419, t. 20^ d: in DC. I. c. p. 27. Dry 

 hills near San Diego, California ; Parry. In our specimens the involucres are all 3-4-tootlied. 



Centrostegia Thurberi, Gray^ in DQ. Prodr. I. c. p. 27 ; Torr. in Bot. Parke's Rep. 7,i>. 19, 

 t. 8. Sandy hills near San Felipe, California, May ; Thurher^ Antisdl. 



Pterostegia drymarioides, Fisch. & Mey. Ind. 2, Sera. Hort. Petrop. p. 48 ; Benth. I. c. San 

 Pasc|[ual, and Napa, California, May ; Thurher. 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 hymexosepalus (n. sp.): glaberrimus; foliis ovato-lanceolatis basi angustatis margine 



subundiilatis ; panicula aphylla, racemis elongatis erectis, verticillis approximatis multifloris ; 



23 k 



