T. PLANTS WRIGHTIAN^. 125 



401. S. riLiFOLius, Nutt, var. Jamesii, Torr. 8f Gray, Fl. 2. p. 444. Sides of 

 mountains, near El Paso ; Sept. " Stems one or two feet high." — Differs from S. 

 longilobus principally in the shorter lobes of the leaves, especially the terminal one, 

 and in the suffrutescent base to the stem. 



402. S. sPARTioiDES, Torr. ^ Gray, Fl. 2. p. 438. Salt plains, at the Western 

 base of the Guadalupe Mountains ; Aug. — Heads larger than in S. longilobus ; the 

 leaves all entire. 



:j: S. Tampicanus, DC. Prodr. 6. p. 427. Between W. Texas and El Paso ; coll. 

 of 1851. Stems a foot high from an annual or biennial root, branching above ; the 

 leaves and branches glabrous, but showing vestiges of floccose wool. Radical and 

 lowest cauline leaves petioled ; the petiole naked at the base. Lobes of the leaves 

 oblong or cuneate, small, all coarsely incised. Heads numerous, corymbose, three 

 lines long. 



403. S. AUREUS, Linn., var. borealis, Torr. 8f Gray, Fl. 2. p. 442 'i Mountains 

 beyond the Limpia ; Aug. The flowers have all fallen from the involucres ; they 

 were probably those of the preceding year.* 



404. Haploesthes Greggii, Gray, PI. Fendl. p. 109, adnot. On the Rio Grande, 

 Texas. " Leaves somewhat succulent." 



405. Centaurea Americana, Nutt. ; Torr. 8^' Gray, Fl. 2. p. 453. Prairies of 

 Western Texas ; May. 



406. CiRsiuM ALTissiMUM, Spreng. ; DC. Prodr. 6. p. 640 ; Torr. 8f Gray, Fl. 

 2. p. 457; var. lanugine deciduo. Banks of a stream between the Pecos and the 

 Limpia ; Aug. 



407. C. UNDULATUM, Spreng. ; DC. Prodr. 6. p. 643 ; Torr. Sf Gray, I. c. 

 Prairies, near San Antonio, Texas ; May. — Various forms of the species are in 

 the collection of 1851. It is common and very widely spread throughout the West- 

 ern region. 



408. C. UNDULATUM, var. /S. Torr. 8f Gray, I. c. C. Hookerianum, Nutt. iii Trans. 

 Amer. Phil. Soc. 7. p. 418. Cnicus discolor, Hook. Fl. Bor.-Am. (parte). Valley 

 between the Pecos and the Limpia ; Aug. Also in the coll. of 1851. — I fear this 

 also passes into C. ochrocentrum. Gray, PL Fendl. p. 110. Perhaps it is likewise 

 C. canescens, Nutt. ; which can hardly be the next. 



X C. ViRGiNiANUM, Michx., var. y. Torr. 8f Gray, I. c. Between Western Texas 

 and El Paso; coll. of 1851. 



409. Perezia runcinata, Lagasca ; Gray, PI. Fendl. p. 110, adnot. Clarionea 

 runcinata, Don; DC. Prodr. 1. p. 62. Bluffs above Austin, and on the Rio Grande, 

 Texas. 



410. P. NANA (Gray, PL Fendl. I. c): caulibus e caudice lanato repente foliosis 

 monocephalis ; foliis rotundatis vel cuneato-obovatis amplexicaulibus coriaceis reti- 

 culatis minute glanduloso-scabridis nitidis undique spinuloso-dentatis ; capitulo 

 20 - 30-floro subsessili folium summum baud superante ; involucro campanulato 

 ebracteato triseriali, squamis ciliolatis mucronato-cuspidatis, extimis ovatis, intimis 



* Senecio ? flocciferus, DC. is a Malacothrix, probably M. saxatilis. 

 VOL. III. ART. 5. — 17. 



