NATURAL SCIENCES OF PHILADELPHIA. 69 



grounds." Stemless and polycephalous ; at least my specimen has four heads 

 nearly sessile on the crown, of equal size with those of the European plant, 

 with which the specimens very well agree, except that the exterior scales of 

 the involucre are all tipped with a manifest spine. Some of the leaves are 

 harely sinuate, as in the common Siberian variety ; others are nearly as 

 deeply pinnatifid as in the European plant. 340. C. edule, Nutt. ? so named 

 in Parry's former collection ; but very probably not that species. In the lack 

 of certain original materials, and of a complete re-examination, I could not 

 pretend to name the Thistles of the Rocky Mountains, Oregon, &c, and am not 

 disposed to add to the existing confusion. 341. C. " a white-flowered spe- 

 cies," between the last and C. fuliosum, (Hook.) DC, if Bourgeau's plant 

 from the Saskatchawan is rightly named.* 



343. C. Deummondii, Torr. and Gr. Caulescent and leafy-stemmed, the ex- 

 terior flowers having a sparingly plumose pappus : certainly very near C. 

 pumilum. 342. Echixais cablimudes, Cass., var. nutans, DC. "Mountains, 

 at middle elevations, and subalpine ; and in fertile, open valleys of Middle 

 Park, where it is very common, and certainly indigenous." Ihave a specimen 

 of this collected by Mr. Samuels in California, which I had thought probably 

 an introduced plant. But it would appear to be truly American as well as 

 Asiatic. The specimens accord with Schrank's and with De Candolle's figures 

 of the Caucasian and Himalayan plant, although, perhaps, the appendages 

 of the involucral scales are a little more dilated. 



344. Mulgedium pulchellum, Nutt. 345. Lygodesmia juxcea, Don. 346. 

 Stephaxomeeia euxcixata, Nutt. 347. Lygodesmia juncea, var. ? rostra1a.\ 

 "On the plains ; Sept. ; rare." 34S. Ceepis euxcixata, Torr. and Gr. 349. 

 Hiebacium triste, . Willd. 350. H. albifloeum, Hook. "Subalpine, west of 

 the range ; rare. "J 351. Nabalus eacejiosus, Hook. " South Park ; rare ;" 

 a low form. 352. See above, p. 66. 353. Ceepis occidentals, Nutt. The 

 same as Parry's 70, omitted accidentally. 354. Teoximum glai/cum, Nutt., 

 var. foliis dilatatis laciniato-pinnatifidis, segmentis lanceolato-attenuatis. Evi- 

 dently a form of Parry's 65. Mr. Hall notes that it "flowers in May and the 

 early part of June, on low mountains," and must be different from the next, 

 which flowers two months later in the same localities. 355. Maceoehyxchus 

 teoximoide.s, Torr. and Gr. (Troximon aurantiacum, Hook.); in a great variety 

 of forms, large and small, from a foot and a half to as many inches in 

 height, with entire, toothed, or laciniate-pannatifid leaves ; the size of the 

 heads equally variable, and with yellow, orange, chocolate-colored or purple 

 corollas. " Very variable at all heights, even alpine ; flowers in July and 

 August." The full suit of specimens show that to this clearly belongs Trox- 

 imon parviflorum and T. roseum, Nntt., and Macrorhynchus purpureus, Gray, PI. 

 Fendl. The fruit, when well developed, is rostrate, with a beak of about 

 equal length with the body of the the achenium. 356. Teoximox glaucum, 

 Nutt., var. dasycephalum, Torr. and Gr. ( T. taraxacifoiium, Nutt.) "High 

 alpine; seemingly different from any of the above." It is also 424 of Parry's 

 separate collection, from Berthoud's Pass. 357. Taeaxaccji moxtaxuji, 



Cirsium eriocephalum. sp. nov., will be tli p most appropriate name for the high-alpine Thistle 

 which I mentioned in the Enumeration of Parry's collection, 1861, p. 9, as C.foliosum, Hook. ? 

 It was again collected in 1S62, nearly in single specimens, both by Mr. Hall and Dr. Tarry. It is 

 remarkable for the. heads of yellow 11 iwers being crowded into a < apitate cluster, as large as a man's 

 fist, foliose-involucrate with very spinose bracts, and clothed with long and very soft, implexed, 

 perhaps deciduous wool : the stem a foot or two in height, very leafy : the leaves linear, caneseent 

 beneath, pinnatifid, the lobes very short and crowded, armed with slender spines. 



f Lygodesmia jbncea, Don., var. rostrata: aeheniis apice rustrato-attenuatis ; capitulis stepe 

 8-9-floris; foliis augustissime linearibus elongatis (in bisce specim. 3-4-poliicai ibus). Heads 

 rather larger than is usual in L.juncea ; achenia half an inch long, the tapering apex directly con- 

 tradicting the generic character "not contracted at the apex," as here they may tie said to be beaked. 

 Dr. llaydi'ii collected the same form on the Laramie Mountains. Xhe'species all need to be de- 

 fined anew. 



% To this belongs Parry's No. 71 of the 1SG2 collection. 



