rtS'J COMPOSITAE (COMPOSITK FAMILY) 



oft&n branched at summit, generally early glabrate throughout; stems few or 

 many and tufted, 2-4 dm. high: leaves crowded on the crowns, rather remote 

 on the stems, lyrately pinnatifid, the lobes either lobtusely or aqdtely 'and 

 irregularly toothed: heads few to many in a corymbose cyme, 8-10 mm. high; 

 calyculate bracts small, few or wanting: achenes glabrous. "(S. Nelsonii 

 uintahensis A. Nels. 1. c. 26: 484.) Closely allied to S. midtilobmtus T. & G. 

 PI. Fendl. 109. 1848, which is a winter annual or' biennial,-, extending from 

 southern Utah to Arizona and western Texas.^Western Colorado- and eastern 

 Utah to Wyoming and Idaho. 



28. Senecio Rydbergii A. Nels. Sim,ple and glabrous perennial with a very 

 short caudex; stem 2*^3 cm. high: basal leaves oblanceolate, thick and some- 

 what fleshy, with the petiole about as long as the blade, dentate or Subentire; 

 lower stem leaves spatulate, with a winged petiole, coarsely denitate;' upper 

 stem leaves sessile, with an auricled base, lobed withtriangularbr.' triangular- 

 lanceolate lobes, acute: cyme corymbose and rather dense; heads about 8 mm. 

 high; bracts about 15, acute, the lanceolate ones few, lanceolate: achene 

 striate, glabrous: rays 4-5 mm. long. (S.fulgens Rydb. 1. c. 177,'not S.fvlgens 

 Nichols.) — ^Throughout the mountains of northern Wyoniing into Idaho. and 

 Montana. - i ■; .,; , 



29. Senecio crocatus Rydb. I.e. 24: 299. 1897. A glabrous perennial with a 

 short erect rootstock; stem 1.5-3 dm. high: basal leaves 2-3 cm. long; obovate 

 or spatulate, crenate or subentire, with a winged petiole; lower stem leaves 

 similar, but with broader winged petioles which are somewhat, auricled at the 

 base, or else oblong without distinction between blade and petiole a!hd then 

 more auricled; upiper stem leaves ovate or triangular, -with, very large and 

 large-toothed auricles: cyme small and compact with heads, -which are 8-10 

 mm. high; bracts about 20, linear: 'rays 7-8 1 mm. long, orange to pale yellow: 

 aichenes striate, glabrous. S. aureus croceus. {S. dimorphophyllus Greene, 

 Pitt. 4: 109. 1900; (S. heterodoxus Greene, ace. to Rydb. Fl. Col.) — Colorado 

 and Wyoming. . , 



30. Senecio cjnabalarioides Nutt. Trans. Am^ PhiL Soc. -7: 412. 1841. 

 Closely- allied to the preceding, generally lower but sometimes 4 dm. high: 

 radical leaves thickish, obovate, cimeate-spatulate and oval, the petioles not 

 wing-margined, and the upper leaves not auricled-clasping: corymb: of few or 

 numerous heads with rays varying fronl yellow to orange: achenes angled, 

 glabrous. S. aureus borealis. {S. Jonesii, S. suhcaneatvis,. S.acutidens Rydb. 

 1. c. "179 & 180, and S.oodes Rydb.l. c. 33: 158 seem to be impossibld -to dis- 

 criminate satisfactorily.) — In the mountains of our range. . n'r- ■ — i 



31. Senecio subnudus DC. Prodr. 7: 428^ 1837. Very glabrous throughout; 

 stems often decumbent at base, simple, slender, 1-3 dm. high, nearlij^ leafless 

 above and usually bearing a single head: radical leaves obovate, slender- 

 petioled, coarsely dentate ; the cauline very few, sessile, oblong to Hnear; incised 

 or somewhat pinnatifid: involucre open-campanulate, 8-10mm.higk7of liiiear- 

 acute bracts: rays 8-12, elongated-oblong: achenes iglabrous,- striatei-. * S. 

 aureus subnudus. ■ (S. solitarius Rydb: Mem. N. Y. Bot. Gard. 1: 444. 1900:)-^— 

 In marshy grounds; from Wyoming and Montana to California and Oregon. 



32. Senecio pseudauireus Rydb. Bull. Torr. Bot. Club. 24:, 298. 1897. 

 Perennial from a creeping root?tock, perfectly glabrous except the tips of 

 the bracts; stem 5-8 dm. high: basal leaves broadly ovate,-' somewhat cordate 

 at the base, serrate, 4-7 cm. long, long-petioled; stem leaves more ontes 

 laciniate at the base, the upper sessile: inflorescence corymbose, flat-topped, 

 of 8 or more heads about 8 mm. high; bracts linear; rays orange,, ^bout 8'mm. 

 long. iS. aureus. {S. platylobus Rydb. 1. c. 27: 181; S. Bavtiarms ^HeUer, 

 Bull. Torr. Bot. Club 26: 622. 1899.) — Replacing the tvueS.' aureus through- 

 out our range. iMI, 



33. Senecio longipetiolatus Rydb. 1. c. 176. A tall, simple, perfectly 

 glabrous perennial, with a short, erect rootstock; stem strict, 3-6 (£m, high, 

 terete: basal leaves oblanceolate, 5-12 cm. long, with a slender ipetiole, ser- 

 rate to subentire; lower stem leaves similar; the upper reduced, lanceolate, 

 sessil^, sharply serrate or laciniate-dentate,' often auricled* at the- base: cyme 



