^ \GOSERis COMPOSITAE 401 



A. barbellulata Greene 1. c. Troxiinon barbellulatum Greene. Not 

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

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

 row, over half-inch high, rather few-flowered; its 10 or 13 bracts nearly 

 equal, lanceolately acuminate, glabrous : flowTers yellow : achenes 3 lines 

 long, about the length of the soft distinctly barbellulate pappus. Grassy 

 slopes, high mountains of southern Oregon and northern California. 



A. tomentosa. 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 en- 

 tire, 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. paiyiflora Greene 1. c. Troximon parviflorwn Nutt. 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 

 oblong 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 6-30 inches high, enlarged and tomen- 

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

 runcinately toothed or lobed: bracts of the involucre moderately well 

 imbricated, 4-13 lines 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. Mountain me.adows, Oregon and Washington to the 

 Rocky Mountains. 



A. gracilenta Greene 1. c. Troximon gracilens 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 V^oming. 



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 : achenes thickish, 3 lines long, with a beak as 

 long or longer. Moist ground, eastern Oregon to California and Utah. 



