68 PLANT-E WRIGHTIAN^. V. 



J Cerasus (Microcerasus) minutiflora, Engelm. in PI. Lindh. 2. p. 185, sub 

 Pruno. Western borders of Texas; coll. of 1851, in fruit. A few fruiting speci- 

 mens were gathered on the former journey, along the prairies of Turkey Creek, 

 June ; but they were not distributed. The plant is a close congener of Amygdalus 

 microphylla, H. B. K. ; but the glaucescent leaves are entire, or nearly so, and very 

 obtuse, or retuse : the larger ones are three quarters of an inch long, not including 

 the slender petiole. The globular fruit is tomentulose, nearly half an inch in diam- 

 eter, the thin flesh dry, narrowly grooved down the ventral suture, down which it 

 inclines to split, as in the Almond, in dried specimens, and to separate from the 

 globose, smooth and even putamen, the sutures of which are slightly and obtusely 

 ridged and grooved, not carinate, and the sides not at all compressed. 



182. Spir^a (Petrophytum) c^spitosa, Nutt. in Torr. 8j- Gray, Fl. 1. p. 418; 

 Gray, PL Fendl. p. 40. Crevices of rocks on the mountains east of El Paso ; 

 forming dense flat tufts, from one to three feet in diameter ; Oct.* 



183. Cercocarpus parvifolius, Nutt. in Torr. 8f Gray, Fl. 1. p. 427; Hook. Ic. 

 PI. t. 323: var. foliis plerisque vix dentatis. Mountains of New Mexico, 40-60 

 miles east of the Rio Grande ; Aug. (in fruit). The leaves are narrower and much 

 less toothed than in No. 194 of Fendler's collection.-]- 



184. Fallugia paradoxa, Torr. in Emory, Rep. t. 2; Gray, PI. Fendl. p. 41. 

 Sieversia paradoxa, Don. Geum ? cercocarpoides, DC. Prodr. 2. p. 554. (ex Icon. !) 

 Banks of the Rio Grande and Nueces, Texas, and westward. — Geum dryadoides 

 may be the Cowania plicata, Don, the C. purpurea, Zucc. (Greggia rupestris, En- 

 gelm. in Wisliz. N. Mew.), abundantly met with by Gregg and others in Northern 

 Mexico ; but its flowers are not white. 



J PoTENTiLLA PARADOXA, Nutt. in. Torr. Sf Gray, Fl. 1. p. 437. Between West- 

 ern Texas and New Mexico ; coll. of 1851. — The root is annual or biennial. 



185. Rosa blanda. Ait., 13. Torr. 8f Gray, Fl. 1. p. 460. Along the Limpia, 

 Aug. ; in fruit. 



LYTHEACE^. 



186. Nes^a longipes (sp. nov.) : herbacea, ramosissima; ramis elongatis gracili- 

 bus ; foliis linearibus oppositis basi auriculata subsessilibus margine revolutis ; pe- 

 dunculis filiformibus in axillis solitariis unifloris sub flore bibracteolatis ; petalis 6 

 purpureis ; staminibus 12 subaequilongis. — Low grounds, along the Rio Grande 

 and Medina, Texas, and west to Zacate Creek ; July. (Near Parras, Gregg.) — 

 Stems slender, from one to three feet long, diffuse or ascending, glabrous, as is the 

 whole plant, slightly angled. Leaves one to two inches long, one to two lines 

 wide, acute. Peduncles about as long as the leaves ; with a pair of small bractlets 

 very near the flower ; from the axils of which there is rarely seen the pedicel of an 



* Lindleya mespiloides, H. B. K., or a species which I have not the means of clearly distinguishing 

 from it, was abundantly gathered by Dr. Gregg, near Saltillo and Buena Vista. It is a " shrub, eight 

 or ten feet high, growing on rocky clilTs." 



+ Cercocarpus fothergilloides, H.B.K., was hkewise gathered by Dr. Gregg, near Saltillo ; where it 

 forms " a large, evergreen shrub." 



