V. PLANTJL WRIGHTIAN^. 103 



The leaves are more compoundly dissected than in that species, which shows traces 

 of similar hispid hairs. But this is more decidedly distinguished by its ovate and 

 acuminate outer involucral scales, with scarcely any margin (those of E. parthenifo- 

 lia being rounded and with broad hyaline margins), and by the marginless achenia. 

 The achenia of E. parthenifolia I do not find so much flattened, nor with such 

 thickened margins, as it is delineated in Delessert's figiire. Dr. Gregg collected it 

 in Cohahuila. 



311. Melampodium cinereum, DC / Prodr. 5. j). 518; Grai/, PI FencU. p. 78, 

 ^ PI Lindh. 2. p. 225. M. leucanthum, Torr. 8f Gray, Fl. 2. p. 271. Hills, 

 near Austin, Texas ; May. 



311". M. ciNEREUM, var. ramosissimum, caulibus gracillimis ; foliis linearibus, 

 aliis integerrimis, aliis sinuato-dentatis vel subpinnatifidis ; capitulis minoribus. — 

 M. ramosissimum, DC. ! I. c. ; Torr. ^ Grag, I. c. Prairies from Austin to the 

 Limpia. Also New Mexico, Wislizenus, &c. A summer state of the species. 



312. SiLPHiuM LACiNiATUM, Liun. ; Torr. Sf Gray, Fl. 2. p. 275. Prairies near 

 San Marcos, Texas.* 



313. Berlandiera lyrata, Benth. PI. Hartiv. ; Gray, PL Fendl. p. 78. Valley 

 of the Limpia ; Aug. " Rays marked with purple veins underneath." A green, 

 scarcely at all canescent vai'iety. The canescent form occurs in the collection of 

 1851, mostly with more pinnatifid leaves, passing into 



314. B. lyeata, var. foliis plerisque subbipinnatifidis laciniatis. — Hills along a 

 tributary of the Pecos ; Aug. 



315. Parthenium incanum, H.B.K.! Nov. Gen. %■ Sp. 4. p. 260. t. 391; DC! 

 Prodr. 5. p. 532. P. ramosissimum, DC. ! I. c. Declivities on the San Pedro Riv- 

 er, and in prairies between the Pecos and the Limpia ; Aug. Dry valley between 

 Mapimi and Guajaquilla, and near Parras. Also at Cerros Bravos (No. 490) ; 

 Northern Mexico, Gregg. Our plant is decidedly shrubby, two or three feet high, 

 with variously sinuate-pinnatifid or lobed canescent leaves ; the flowering branches 

 more or less herbaceous. It is the same as Berlandier's No. 1342, on which P. 

 ramosissimum was founded. But I find no essential diff"erence between it and Ber- 

 landier's No. 632, from mountains near the city of Mexico, which is the same as 

 Humboldt's plant, and which I suspect is not an annual, but is more or less woody 

 at the base. The flowers, achenia, and pappus are the same in both : the achenia, at 

 least in Berlandier's No. 632, are not broadly margined, as represented in Kunth's 

 figure, but the slender marginal nerves separate from below upwards, as in the oth- 

 er species. The awns of the pappus are subulate-setaceous, at first erect or a little 

 spreading, at length divergent or even recurved. 



316. P. Hysterophorus, Linn.; DC. 1. c, var. hirto-canescens ; foliis lyrato- 

 pinnatifidis nunc subbipinnatifidis, segmentis brevibus obtusissimis. — On the Rio 

 Grande, Texas and New Mexico. Near Parras and Buena Vista (No. 86), Gregg. 

 — Only a variety of P. Hysterophorus, I believe, but a remarkable one. The root 

 is that of an annual ; but the stems are occasionally lignescent towards the base. 



* Silphium doronicifoUum, Kuiize, Ind. Sent. Hort. Lips. 1846, is only S. terebinthinaceum. 



