526 COMPOSITAE (COMPOSITE FAMILY) 



nearly sessile to long-petioled, blade elliptic to narrowly oblong, 2-5 cm. long 

 (including the petiole), almost glabrous; stem leaves several, broadly linear, 

 acuminate, 2-3 cm. long; pubescence similar to that of the stem: heads large, 

 when fully expanded 3 cm. broad; involucral bracts involved in a dense, dark 

 purple wool. (E. oreocharis Greene.) Subalpine in moist parks; Colorado 

 and Wyoming. 



11. Erigeron uniflorus L. Sp. PI. 864. 1753. Stems 3-8 cm. high or more, 

 strictly monocephalous, few-leaved, often naked and pedunculiform at summit: 

 radical leaves spatulate or pblanceolate, 2-4 cm. long; cauline lanceolate to 

 linear: involucre usually hirsute as well as lanate, occasionally becoming 

 naked; the linear-acute bracts rather close, or merely the short tips spreading: 

 rays purple or paler, 4-8 mm. long. (E. simplex Greene, Fl. Fr. 387. 1897; 

 E. leucotrichus Rydb. 1. c. 28: 23. 1901; E. grandiflorus Hook., as to our 

 range.) Alpine; from Colorado to the arctic regions. 



12. Erigeron Garrettii A. Nels. Perennial from a short woody somewhat 

 branched and tufted crown: leaves all basal, nearly or quite glabrous, 2-4 cm. 

 long, oblanceolate, obtuse or subacute, tapering to a short petiole: scape 7-12 

 cm. long; the solitary heads large, 2-3 cm. broad; involucre dark green, 

 7-8 mm. high, obscurely hirsutulous as is also the scape; the bracts linear- 

 subulate: rays 40-50, white, linear-spatulate, the ligule 8-10 mm. long: 

 outer pappus minute or wanting. Reported only from Cottonwood Canon, 

 Utah. 



13. Erigeron tener Gray, Proc. Am. Acad. 16: 91. 1880. Whole plant 

 canescent (almost silvery) with minute rather soft pubescence ; caudex branch- 

 ing, bearing many rigid, erect, slender stems 8-12 cm. high, sparingly branched 

 near the summit, the branches monocephalous: radical leaves thickish and 

 firm, broadly obovate-spatulate, abruptly acuminate, rather indistinctly 

 callous-tipped, 12-18 mm. long by 7-10 mm. wide, on slender petioles twice 

 their length; stem leaves few and small, spatulate-lanceolate : heads rather 

 small; bracts of the involucre narrow-lanceolate, greenish with somewhat 

 scarious margins: achenes compressed, hirsute: pappus simple. (E, Tweedyi 

 Canby, Bot. Gaz. 13: 17. 1888.) Rocky dry hills; from Montana and Wyo- 

 ming to Nevada. 



14. Erigeron nauseosus (Jones) A. Nels. Bot. Gaz. 37: 270. 1904. Tufted 

 perennial, 1-2 dm. high, leafy throughout, the whole plant minutely scabrous 

 and the leaves hispid-ciliate : basal leaves spatulate to obovate, 4-8 cm. long; 

 the upper similar but gradually smaller, sessile or almost clasping: heads 

 mostly solitary on the leafy ascending stems; the peduncle proper only 2-3 cm. 

 long, glutinous or viscid, as is also the involucre, and with a nauseating odor; 

 the bracts somewhat scabrous, abruptly acuminate: rays white or nearly so. 

 Hot sandy benches at the base of cliffs; mountains of Utah. 



15. Erigeron leiomeris Gray, Syn. Fl. 1: 211. 1884. Stems 8-15 cm. high 

 from the somewhat surculose branches of the caudex, smooth and very gla- 

 brous (or some minute hairiness at least on the petioles) : leaves bright green, 

 mainly radical and spatulate, very obtuse (larger 3-4 cm. long, with taper- 

 ing base or petiole of at least equal length), 3-10 mm. wide; cauline only 

 2 or 3 and smaller: involucre 6-7 mm. high; the bracts lanceolate and not 

 attenuate, glabrous but pruinose-glandular, brownish-purple: rays about 

 40, linear, violet, 6-8 mm. long. (E. spathulifolius Rydb. 1. c. 26: 545. 1899.) 

 In the alpine regions; Wyoming and Colorado to Utah and Nevada. 



16. Erigeron glandulosus Porter, Fl. Col. 60. 1874. Caespitose from a 

 stout caudex, 1-2 dm. high, rigid, granulose-glandular or glandular-scabrous 

 and with sparse or hispid hairs, especially on the margins of the leaves: leaves 

 thickish, spatulate to Imear-oblanceolate, 3-8 cm. long: head 8-10 mm. high; 

 involucre glandular or viscid as well as pubescent: rays 40 or 50, violet or 

 purple, 8-12 mm. long. Middle elevations in the foothills; Wyoming and 

 Colorado. 



17. Erigeron radicatus Hook. Fl. Bor. Am. 2: 17. 1834. Stems slender, 

 ascending, 5-10 cm. high, more or less tufted on the woody caudex: leaves all 

 spatulate-linear or wider, the broadest only 2-4 mm. wide, hirsute or hir- 



