68 PROCEEDINGS OP THE ACADEMY OF 



var. /?, Torr. and Gr. Fl., verging towards the next. 324. S. axdint.s, Nutt. ? 

 from the locality (but the heads resemble those of the last, and are of equal 

 size), or an undescribed species, if Nuttall's S. andinus is Hooker's 5. serra; 

 intermediate between the latter and S. triangularis. Fremont collected a 

 single specimen of it in his second expedition. 327. S. eremophilus, Richards. 

 328. S. longilobus, Benth., from the plains, with pinnately-parted leaves 

 (Parry's No. 407) ; with a mountain form, having the leaves all entire and the 

 heads narrow. The latter is the same as Parry's No. 406. The variations of 

 S. filifolius, longilobus, spartioides and Riddellii, are now wholly inextricable. 

 330. S. canits, Hook., a form with large heads and the leaves all entire, the 

 same as Parry's No. 20 ; " alpine and subalpine." 229. S. aureus var. al- 

 pinus, Gray, Enum. PI. Parry, No. 63. This holds its character ; but the heads 

 are sometimes as many as three in a corymb. Different from S. aureus as it 

 appears, it is inseparably connected with it through the var. borealis. 313. 

 S. aureus, var. alpinus, werneriwfolius,* very peculiar, truly alpine form, 

 which would almost anywhere be regarded as a very distinct new species ; 

 but I think it runs into the last and into Wright's 403, &c. These forms all 

 teach that S. subundus, DC, and S. resedifolius, Less., will also pass into -S". 

 aureus. Indeed, I know not where the species will stop. 332. S. aureus, L. ? 

 var. croceus. Middle Park, &c. Both Dr. Parry (who has it as No. 405) and 

 Mr. Hall note this as a form of the common S. aureus with copper-colored or 

 saffron-colored flowers, and I cannot gainsay it, after reviewing a suite of speci- 

 mens. Some of Hall and Harbour's specimens, except in the anomalous 

 color of the flowers, very much resemble *?. aquaticus of the Old World. One 

 form is discoid. 333. S. aureus, var. borealis and var. Balsamitce, Torr. and 

 Gr.; glabrate or woolly, in various forms. "A common and very variable spe- 

 cies, at all localities and heights, except strictly alpine. Some of the speci- 

 mens are passing to S. Fendleri, Gray. 



334. Arnica angustifolia, Vahl. ; broad-leaved forms of A. alpina, Brest. 

 "A variable species, from the low middle to the alpine region, flowering early 

 and late." 335. A. mollis, Hook. ; "alpine and subalpine." 336. A. cor- 

 difolia, Hook., mixed with some A. latifolia, Bongard, (which Dr. Parry 

 abundantly gathered in Berthouds Pass ; No. 408 of his collection) ; the lat- 

 ter known by the sessile cauline leaves, the narrower heads, and the almost 

 glabrous achenia. 337. A. Chamissoxis, Less. South Park, &c. Passes into 

 leafy forms of A. angustifolia. 338. A. akgustifolia ? var. eradiata, or per- 

 haps a distinct species. This is Parry's No. 10, resembling some rough-hirsute 

 forms of A. angustifolia, approaching A. mollis, but the cauline leaves de- 

 creasing upwards ; and the rayless character holds in the numerous specimens 

 gathered in 1862: the achenia are glabrate, although the ovaries are pu- 

 bescent. It can hardly be a form of the Californian A. discoidea ; but it needs 

 farther comparison with that species.* 



339. Cirsium acaule, All., var. Americanum. " Subalpine ; common in wet 



* Senecio aureus, L., var. (alpinus) wernerijefolius : multieipiti-cajspitosus, primum arach- 

 noideus; foliis radicalibus confertis spathulato-oblanceolatis sen spathulato-Unearibus basi attenu- 

 ates erectis coriaceis rigidis aveniis integerrimis marginibus sajpissime revolutis inox glabratis 

 (cum petiolo 2-4-poll. longis 2-3 lin. latis); scapoaphyllo, (3-5-pollicari) bracteis paucis subulato- 

 getaceis lana obvolutis instructo corymboso-3-5-cepbalo ; capitulis, etc., S. aurei. Tbe leaves 

 may be likened to those of Wemeria or of Cutcitium longifolium or nivale. 



The following might be thought to be a form of this, or of Wright's 403; but, besides the small 

 leaves, the achenia are papillose-hirsute, instead of perfectly glabrous. 



Senecio Thurberi (sp. nov.); caespitosus, cano-tomentulosus mox glabrescens; foliis plerisque 

 radicalibus confertis angustissime linearibus basi sensim attenuatis (cum petiolo circiter pollicem 

 longis) rigidulis integerrimis vel obsolete 2-3-dentatis marginibus quandoque revolutis; scapo 

 spithamaso 3-5-cephalo foliis pci'iiaucis subulatis bracteisve instructo; capitulis fere S. aurei, sed 

 acheniis crebre papilloso-hirtellis 1 S. canus, var. pygmseus, Gray, in Bot. Mex. Bound, p. 103. 

 Santa Rita del Cobre, New Mexico, Prof. Thurber, Dr. J. M. Bigelow. 



t Tetrad ymia canescens, DC, the form with rather smaller heads and shorter leaves (T. inrr- 

 mis, Nutt.), was collected in the Middle Tark by Dr. Parry, No. 416. 



[Mar. 



