582 COMPOSITAE (COMPOSITE FAMILY) 



often 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 obtusely or acutely 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. multilobatus 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. Simple 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 dentate; upper 

 stem leaves sessile, with an auricled base, lobed with triangular or 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.fuLgens 

 Nichols.) Throughout the mountains of northern Wyoming into Idaho and 

 Montana. 



29. Senecio crocatus Rydb. 1. c. 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 and then 

 more auricled; upper 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 mm. long, orange to pale yellow: 

 achenes 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 cymbalarioides Nutt. Trans. Am. Phil. Soc. 7: 412. 1841. 

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

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

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

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

 glabrous. S. aureus borealis. (S. Jonesii, S. subcuneatus, S. acutidens Rydb. 

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

 criminate satisfactorily.) In the mountains of our range. 



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

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

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

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

 or somewhat pinnatifid: involucre open-campanulate, 8-10 mm. high, of linear- 

 acute bracts: rays 8-12, elongated-oblong: achenes glabrous, striate. 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 pseudaureus Rydb. Bull. Torr. Bot. Club 24: 298. 1X97. 

 Perennial from a creeping rootstock, 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 or less 

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

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

 long. S. aureus. (S. platylobus Rydb. 1. c. 27: 181; S. Hartianus Heller, 

 Bull. Torr. Bot. Club 26: 622. 1899.) Replacing the true S. aureus through- 

 out our range. 



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

 glabrous perennial, with a short, erect rootstock; stem strict, 3-6 dm. hijih, 

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

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

 sessile, sharply serrate or laciniate-dentate, often auricled at the base: cyme 



