VI. PLANTS WRIGHTIAN^. 69 



base, except the floral ones. Stipular sheaths bearing 5 to 7 setae on each side ; 

 these are beset, especially those of the upper and floral leaves, with strong bristles. 

 Head rather few-flowered. Bracteal stipular setae strongly setose with long hispid 

 hairs. Ovary didymous, nearly glabrous. Lobes of the calyx four, equal (or some- 

 times two of them very short), and with as many small interposed teeth, hispid-ciliate 

 towards the base. Corolla slender, only two lines long. Mature fruit not seen. 



DiODiA TERES, Watt. ; Ton: S,' Gnn/ ; var. 1 parvula ; caule subsimplici erccti- 

 usculo ; foliis anguste lincaribus acutissiinis. — Mountain valleys between the San 

 Pedro and Santa Cruz, Sonora; -Sept. (1122.) — The specimens are small, from 2 

 to 6 inches high, from an annual root, nearly erect, and resemble the narrowest- 

 leaved forms from New Jersey, rather than the plant of the Southern States. 



C0MP0SITJ5. 



Vernonia Jamesii, Torr. 8f Gray, Fl. 2. p. 58. Valley of the Limpio and Rain- 

 water Creek; June. — The form wath smaller heads. (1391.) 



V. LiNDHEiMERi, Gray &f Enyehn. PL Lindh. 2.^?. 217. Pebbly bed of the San 

 Pedro, Western Texas ; July. (1392.) 



Pectis prostrata, Cav. ; Gray, PI. Wriyht. p. 83. Eocky hills, between the 

 copper mines and Conde's Camp, New Mexico, Aug. ; and near Santa Cruz, Sonora, 

 Sept. A dwarf variety, like Wright's No. 2-45. (1123.) 



P. (Pectidopsis) angustifolia, Torr.; Gray, PI. Fendl. p.Q>\,^ PI. Wright. 1. c. 

 Stony hills near the copper mines, New Mexico; Aug. (112-1.) — The original 

 form of the species, without any awns to the pappus. 



P. (Pectidopsis) filipes, Harv. 8f Gray, PL FendL p. 62. Stony hills of Copper- 

 mine Creek, New Mexico; Aug. (1125.) — A low, divergently much-branched 

 plant, with the capillary peduncles from 12 to 18 lines long: exactly like No. 329 

 of Coulter's Californian Collection, except that the pappus of the disk-flowers is 

 commonly one-awned. P. uniaristata, DC. is described as having mucrouate-aristate 

 leaves, and the scales of the involucre acuminate. 



P. (Pectothrix) papposa, Harv. 8f Gray, L c. Sandy soil, at Dona Ana, New 

 Mexico; July. (1126.) — "Divaricately much-branched from the root, procum- 

 bent." I have raised this from seed in the Cambridge Botanic Garden. Its pros- 

 trate, divergently-branched stems extend to a foot in length ; its leaves are often 2 

 inches or more in length, barely a line wide, rather fleshy ; the peduncles about an 

 inch long. Involucre 3 lines long ; the golden-yellow ligules (8) about the same 

 length. The pappus of the ray is very short, somewhat auriculate or coroniform, 

 sometimes nearly obsolete. — In a single wild specimen, intermixed with the others, 

 the pappus is reduced to setae very much shorter than the tube of the corolla, and 

 more or less coroniform-concreted ; otherwise it is undistinguishable from the rest 

 of the specimens. 



P. (Pectothrix) longipes (sp. nov.) : herbacea, glabra; caulibus brevibus 

 ramosissimis decumbentibus ; foliis linearibus mucronatis secus margiucs grosse 

 glandulosis basi ciliis utrinque 1-3 instructis ; pedunculis pra;longis ; involucri 

 multiflori squamis 12-13 uniglandulosis ; pappo radii biaristato, disci multisetoso. 



PL. WR. — 10. 



