

COMPOSITAE (COMPOSITE FAMILY) 599 



1901; Agoseris agrestis Osterh. Bull. Torr. Bot. Club 28: 645. 1901; A. roseola 

 Rydb. 1. c.) Throughout our range and northward and westward. 



3a. Troxixnon glaucum dasycephalum T. & G. Fl. 2: 490. 1843. "This 

 plant differs from T. glaucum only in having a pubescent involucre. It is 

 scarcely worth nomenclatural recognition." (C. V. Piper in Contrib. U. S. 

 Nat. Herb. 11: 542. 1906.) (Agoseris scorzoneraefolia Greene, Pitt. 2: 177. 

 1891; A. altissima Rydb. Mem. N. Y. Bot. Gard. 1: 458. 1900.) Same range 

 as the species. 



36. Troxiinon glaucum pumilum (Nutt.) A. Nels. A low, tufted form 

 usually with narrow and often with laciniately-toothed leaves: involucre more 

 or less pubescent. T. glaucum laciniatum in part. (T. pumilum Nutt. Trans. 

 Am. Phil. Soc. 7: 434. 1841; Agoseris Leontodon Rydb. 1. c. 457.) Colorado 

 to Montana and the Dakotas. 



4. Troxiinon parviflorum Nutt. 1. c. Caudex multicipital, the narrowly 

 linear or broader and lanceolate leaves strictly 2-ranked, thus subtending the 

 more or less decumbent scapes; whole plant nearly or quite glabrous: bracts of 

 the involucre nearly equal, all lanceolate-acuminate: heads and achenes much 

 shorter than in the last, the latter almost beakless: pappus less flaccid and 

 more nearly approaching the deciduous. T. glaucum parviflorum. Colorado 

 and Utah to Montana and the Dakotas. 



5. Troximon arachnoideum (Rydb.) A. Nels. Dwarf, the few stems from 

 the crown or crowns of the rather slender root only 7-20 cm. high: leaves 

 mostly lanceolate in outline but lacihiate-pinnatifid with linear divisions, or 

 in the smaller forms linear and entire, more or less cinereous or lanate-pubes- 

 cent: rays of the rather small heads yellow, often purplish externally or in 

 drying: the body, the beak, and the pappus of the achene each about 5 mm. 

 long. T. glaucum laciniatum in part (not T. laciniatum Gray. Proc. Am. 

 Acad. 19: 71. 1883; Agoseris laciniata Greene, 1. c. 178; A. arachnoideaRydb. 

 Bull. Torr. Club S: 511. 1901). Open slopes, middle elevation ; in our range 

 and west to the Sierras. 



6. Troximon aurantiacum Hook. Fl.Bor. Am. 1: 300. pi. 104. 1833. Nearly 

 glabrous, deep green and not at all glaucous: leaves oblanceolate, obtuse, en- 

 tire, narrowed to a short petiole: involucre 15-20 mm. high; the bracts broadly 

 to narrowly lanceolate, acute, or the outer and looser ones oblong and obtuse: 

 flowers orange, drying brownish or purple: achenes thickish, tapering gradually 

 to a short, stout beak. (Agoseris earned Rydb. Mem. N. Y. Bot. Gard. 1: 

 458. 1900.) Mountain parks; from our range to the coast states. 



7. Troximon purpureum (Gray) A. Nels. Sparsely lanate when young, in 

 age glabrate, more or less glaucous; scapes 2-5 dm. high, enlarged and tomen- 

 tose at the summit: leaves linear to lanceolate, saliently or often runci- 

 nately toothed or lobed: bracts of the involucre moderately well imbricated, 

 10-25 mm. long, lanceolate and long-acuminate, or the outer ones oblong and 

 obtuse: corollas deep saffron-color, drying purple: achenes black, fusiform, 

 with a slender beak about as long as the body: pappus white. (Macro- 

 rhynchus purpureus Gray, Pl.-Fendl. 114. 1849; T. gracilens Gray, Proc. Am. 

 Acad. 19: 72. 1883; Agoseris Greenei Rydb. as to our range.) Colorado to 

 Montana and westward. 



8. Troximon arizonicum Greene, Pitt. 2: 78. 1890. About 3 dm. high, 

 slender, glabrous except a woolliness under the involucre: leaves narrowly 

 oblanceolate, entire or runcinately toothed: head about 25 mm. high, few- 

 flowered, more than 25 mm. broad when expanded; involucral bracts in two 

 series, the outer oblong, the inner lanceolate, all purple in the middle: ligules 

 light yellow: beak of the achene very much attenuate, longer than the body; 

 pappus fragile and deciduous. (Agoseris elongata Greene; A. rostrata and A. 

 humilis Rydb. Bull. Torr. Bot. Club 32: 137. 1905.) Colorado to New 

 Mexico and Arizona. 



9. Troxiinon elatum (Nutt.) A. Nels. Robust, scapes 2-5 dm. high: leaves 

 thickish, lanceolate to spatulate, sparingly dentate to pinnatifid, 2-3 dm. 

 long, glaucous: heads 25-30 mm. high and broad; involucral bracts lanceo- 

 late, acute, more or less pubescent : corollas yellow : achene thickish, 6 mm. 



