agoseris COMPOSITE 401 



glaucous: scapes slender, 1-3 inches high: linear-lanceolate, laciniate-pin- 

 natifid into a few short and narrow lobes, or some entire: involucre narrow, 

 over half -inch high, rather few-flowered; its 10 or 12 bracts nearly equal, lan- 

 ceolately acuminate, glabrous: flowers yellow: achenes 3 lines long, about the 

 length of the soft distinctly barbellulate pappus. Grassy slopes, high moun- 

 tains of southern Oregon and northern California . 



A. toinentosa. More or less tomentose up to the involucre: scapes 

 rather stout, 4-10 inches high: leaves lanceolate to linear in outline, irregu- 

 larly and often retrorsely lobed or toothed, or some of the inner ones entire, 

 acute, or acuminate, attenuate below to a short winged petiole, nearly as 

 long as the scapes: involucre campanulate, 8-9 lines high, of rather numerous 

 imbricated, lanceolate acuminate scarious-margined mostly glabrous bracts: 

 achenes fusiform, short-beaked, much shorter than the brownish pappus. On 

 grassy slopes, Stein Mountain southeastern Oregon. 



A. parviflora Greene 1. c. Troximon parviflorum Xutt. Glabrous 

 throughout: scapes slender, much longer than the leaves 5-15 inches high: 

 leaves narrowly linear, acuminate, entire, 3-8 inches long: 1-3 lines wide: 

 heads an inch broad or less: involucre oblong-ovoid, becoming nearly hemi- 

 spheric in fruit, 6-8 lines high; its bracts lanceolate and acuminate: achenes 

 conspicuously beaked, about 4 lines long: pappus of numerous unequal very 

 slender bristles. Plains, Idaho to Manitoba, Nebraska and New Mexico. 



§ 2 Achenes with a slender and mostly filiform nerveless beak and 

 soft pappus: acaulescent perennials. 



* Achenes acute or tapering at summit into a beak but little if at all 

 longer than the cylindraceous or narrowly fusiform body. 



A. aurantiaca Greene 1 c. Troximon aurantiacum Hook. Nearly 

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

 entire, narrowed to a slender petiole: involucre 7-9 lines high: its bracts 

 from broadly to narrowly lanceolate, acute, or the outer and looser ones ob- 

 long and obtuse: flowers orange, drying brownish or purple achenes thickish, 

 tapering gradually to a short stout beak. High mountain prairies, Oregon to 

 Alaska and the Rocky Mountains. 



A. purpurea Greene 1. c. Sparsely lanate when young, in age glab- 

 rate, more or less glaucous: scapes 6-20 inches high, enlarged and tomentose 

 at the summit: leaves from linear to lanceolate saliently or often runcinately 

 toothed or lobed: bracts of the involucre moderately well imbricated, 4-12 

 lines long, lanceolate and long-acuminate, or the outer ones oblong and ob- 

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

 with a slender beak about as long as the body: pappus white. Mountain 

 meadows, Oregon and Washington to the Rocky Mountains. 



A. gracileuta Greene 1. c. Troximon gracihns Gray Scapes slender, 

 10-18 inches high: leaves mostly entire, from lanceolate to nearly linear, or 

 some narrowly spatulate : involucral bracts narrow: corollas deep orange: 

 achenes fusiform-linear, 3-4 lines long; the very slender beak as long or 

 longer: pappus soft but not flaccid. In the Cascade Mountains of Oregon 

 and Washington to Wyoming. 



A. elata Greene 1. c, Troximon Nuttallii Gray. Robust; scapes 6-20 

 inches high: leaves thickish, from lanceolate to spatulate, and from spar- 

 ingly dentate to pinnatifid, 6-12 inches long, glaucous: heads an inch or more 

 high and broad: involucral bracts lanceolate, acute, more or less pubescent : 

 corollas yellow: achene thickish, 3 lines long, with a beak as long or longer. 

 Moist ground, eastern Oregon to California and Utah. 



