102 PLANT.E WRIGHTIAN.E. TI. 



usually monoceplialous. The whole plant is covered with a white wool, which is 

 looser and more arachnoid than in C. undulatum ; and the upper surface is found to 

 be smooth when the woolly covering is rubbed off. The involucre, also loosely 

 woolly, is about an inch and a half in diameter, not bracteate ; the scales with a 

 chartaceous or coriaceous and appressed base ; and all but the innermost with a 

 foliaceous-acuminate and spine-tipped entire appendage, which is widely spreading, 

 or the exterior scales reflexed. This should be compared with Cirsium Mexi- 

 canum, DC. (but it is wholly unlike C. lanceolatum) and with C. cerniiam. Lag. 

 The involucre most resembles that of C. heterolepis, Benth. (to which belongs, I 

 believe, No. 467 of Coulters Mexican collection), but it is smaller and less 

 foliaceous. 



C. Grahami (sp. nov.) : caule 3 - 5-pedali apice parce ramoso ; ramis mono- 

 cephalis ; foliis subtus cano-lanuginosis supra leviter arachnoideis mox nudis minute 

 viscoso-hirtellis lanceolatis sinuatis vel subpinnatifidis spinuloso-ciliatis lobis denti- 

 busve breviter spinosis, caulinis semiamplexicaulibus baud decurrentibus ; involucre 

 subgloboso basi bracteolis 2-3 parvis instructo, squamis coriaceis appressis gla- 

 bratis lanceolatis spinula brevissima apiculatis ; corollis intense purpureis. — Low 

 grounds, in valleys between the Sonoita and the San Pedro, Sonora ; Sept. (1296.) 

 — Radical leaves over a foot in length and three inches wide ; those of the elongated 

 flowering branches one to three inches long ; the uppermost linear. Head an inch 

 and a half in length. Scales of the involucre barely spinulose-mucronate or cus- 

 pidate. Flowers very bright and deep purple. The nearly muticous involucre, the 

 deep purple flowers, and the leaves bare and green above, principally distinguish 

 this from some forms of C. undulatum, which moreover grows in high and dry 

 ground. It is named in honor of Col. J. D. Graham, under whose auspices the 

 collection was made. 



Perezia ruxcinata, Lagasca ; Gray, PI. Wright. }!. 125. Stony hills of the 

 Pecos and San Felipe Creek, Texas ; May, July. (1297.) 



P. NANA, Gray, PL Fendl. p. Ill, ^ PI. Wright. I. c. Along branches of the San 

 Pedro, Sonora; Sept. Stony hills, near El Paso ; March. (lll'S.) — "Plant very 

 sweet-scented in drying." 



P. Wrightii, Gray, PI. Wright, p. 127. Prairies along the Kio Frio, "Western 

 Texas; May. (1298.) 



Trixis ANGUSTiroLiA, DC. Prodr. 1. p. 69; Gray, PI. Wright, p. 128; var. 

 foliis lato-lanceolatis ssepe denticulatis. — Ravines, at Santa Cruz, Sonora ; Sept. 

 Mountains near El Paso; May. (1299.) — The leaves are' very much wider than 

 in Gregg's specimens ; those of Wright's former collection are intermediate in their 

 form. 



Leria nutans, DC. Prodr. 7. p. 42. Comanche Creek, Western Texas; May. 



Calais linearifolia, DC. ; Torr. 8f Gray, Fl. 2. p. 471. Shore of Lake Gusman, 

 Chihuahua. Also sandy hills. Camp Fillmore, and on the adjacent Organ Moun- 

 tains, New Mexico; April. (1419.) — The specimens accord well with the Cali- 

 fornian plant, except that the scales of the involucre are scarcely so much acumi- 

 nate, and the achenia rather less beaked ; — differences which do not appear to 



