COMPOSITAE (composite family) 579 



thickly dentatei deltoid-lanceolate or the lower triangular-hastate or deltrad- 

 cordate and the uppermost lanceolate with cuneate base : heads about 12 mm. 

 high; involucre campanulate, : mostly 25-30-flowered, the oblong-linear l-d,ys 

 6-12. (S.isaitensiRydb. Bull. TonriBot. Club 24: 298. 1897-,S:irigonophyllus 

 Greene, Pitt. '3: 106. 1896.) — Wet places in the mountains of our range 

 and ^westward' to the coast States. ' 'i.iir! > ^ ■< 



:10i iSenecio serra Hook. 1. c. 333. Strict, 7-12 dm. hifeh, very leafy, com- 

 monly branching I at summit, and bearing numerous corymbosely paniculate 

 smaller heads: leaves 8-14 cm. long, all lanfceolate and tapering to bcith 

 ends, sessile by a narrow base, or the lowest short-petioled, usually with the 

 whole margin thickly serrate or serrulate with very acute salient teeth': in- 

 volucre oblong-campanulate, 20-30-fldwered; rays 5-8,' oblong-linear, {S. 

 andihus Nuttj Tratis. Ain. Phil. Sob. 7: 409. 1841; 8 i' serra inlegriuscUlus 

 Goray, iSyiii TL 1 ; 387. 1886.) — Along streams, middle elevations and upward ; 

 Northern 1 Wyoming, northward and westward. 1 1 ; . i ' I 



10a. Senecib serra admirabilis (Greene) A. Nels. Not constantly separable 

 from the Species,' usually of more vigorous 'growth and with fewer and larger 

 heads' but these often 40 or more. {S. admirdbiUi Greene, Erythea 3:''23.' 

 1895.) — In the mountains of Colorado and southern Wyoming. ^ 



11.' Seneciocrassulus Gray, 'Proc. Am. Acad; 19: 54. 1883. Stems 2-4 dm. 

 high, glabrousi 5-7-leaved, bearing 3-8 pedunculate rather large and thick 

 heads: leaves oblong-lanceolate^ apiculate-acute, 5-21 cm. long; the radical 

 and lowest cauline spatulate or Obovate-oblong, narrowed into a short-winged 



getiole^;' the upper sessile by partly clasping or decurrent base : involucre 40-50- 

 owered, of 12 fleshy-thickened but thin-edged bracts, the base also thick- 

 ened,' the whole' becoming conical and many-angled, in fruit: rays about 8. 

 (S. semiamplexicaulisRydb. Mem. N. Y. Bot. Gard. 1: 440. 1900; S. lapaihi- 

 folius Greene, PL' Baker. 3: 25. 1901.)^^In the moiintains of our range: 



12. Senecio.rapifolius Nutt. Trans. Am. Phil. Soc. 7: 409. 1841. Stem 

 rather low, only 2-4 dm. high: leaves ovate or oblong, very sharply and iin-' 

 equally dentate throughout, somewhat fleshy; the radical taping "into a 

 petiole; the cauline clasping by a broad subcordate base: heads numerous, 

 cymose-panicvdate,' only 5-6 mm. high, always rayless, about 15-flowered.^^ 

 Middle elevations on theeastern slope of the Rocky Mountains. ;' 



13. Senecio ihydrophiliis Nutt. 1. c. Very glabrous and smooth, t'all, 

 strict and simple-stemmed, with a cluster of coarse fibrous roots, 6-15 dm. 

 high:' leaves fleshy-coriaceous, all entire or barely denticulate, mostly lanceo- 

 late; the radical oblanceolate and stout-'petioled, sometimes 3 dm. long; the 

 upper cauliae sessile or partly 'clasping: heads numerous in a branching cyme; 

 bracts 8-12: disk-flowers 15-30: rays 3-6 and small, or none. (S. hydrophi- 

 loides Rydb. li d 441.) — In wet or partially flooded grounds; throughout our 

 range aiid noirth ward and westward. 



14. Sfenecio glaucescens Rydb. 1. c. The short caudex with a cluster of 

 fibrous roots, glabrous or at first slightly hairy ; stem 2-7 dm. high, striate, 

 shiningj orften tinged with red: basal leaves and lower stem leaves 5-ip cm. 

 long, I spatulate or oblanceolate or even oval, callous, dentate or very rarely 

 subentire, acute or obtuse,' with a distinct winged petiole, rather thick and 

 often somewhat glaucous; upper stem leaves reduced, lanceolate and sessile: 

 cyme corymbiform; heads about 1 cm. hi^; bracts linear-lanceolate, acute, 

 with conspicuous black tips: rays about 8 mm', long: achenes oblong-cylindric, 

 glabrous. \{S. exaltoHes Nutt. l.'c. as to our range; S. Flthtii'Rfdb.'BxAT^To'tT. 

 Bot. Club 33: 157. 1906.) — Colorado and Utah to Montana and Idaho. ' 



15. Senecio anacletus Greene, Pitt. 14: 307: 1901. Sterii 3-6 dm: high, from 

 a short rootstock or caudex: leaves thickish and firm;' the radical obovate! 

 tO'Obloiig, obscurely veiny, mostly acute, numerously deliticulate, 5-16 cm.' 

 long, tapering into shorter wing-margined petioles; the cauline sessile, few 

 and oblong-lanceolate, or commonly only 1 or 2 small and bract-like ones sub-' ' 

 tending the rather few-headed branches of the cyme: heads 10-12 mm. high; ' 

 involucral bracts linear: rays G-10, conspicuous. (S. microdontus Heller, Bull'. 

 Torr. Bot. Club 24 : 497. 1897.)— Southern Colorado, New Mexico, and Arizonai. ' 



