524 coMPosiTAE (composite family) 



Bracts appressed-hirsute 20. Ei. jBatonii. 



Herbage conspicuously hispid or hirsute-cUiate . . 24. E. pumilus. 



Leaves 3-nervea, at least at base 23. E. microlonchus, 



SagB not white. 



Pubescence very short. 



Leaves 3jjerved 25. E. coryn^bos\is. 



Leaves l-nerved ' 26. E. caespitdsus. 



Pubescence hispid, long and spreadine . . . 27. E. concinntis. 

 Leaves dissected or deeply cleft. 

 Leaves ternately divided. 



Twice to thrice ternate , 28. E. compositus. 



Once ternate or quinate . . , , - . 29. E.' trifidusj 



Leaves pinnately divided . 30. £. pinnatisectus, 



ANNCAIS OR BIENNIALS 



Leaves not cordate-clasping. 

 Stems simple at least below; the heads few, large. 



Involucre hirsute or strigose 8. E. asper. 



Involucre more or less glaiidular or vis6id . , . , 0, E, formosissimus. 

 Stems branched; the heads small, several to many. 



Stems simple at base but branching upward , . , 31, E, ramosus. 

 Stems branching from the base and in no. 32 also above. 



Leafy throughout . . 32. E. divlergens. 



Leafy below and terminating in a scape-like peduncle. ' ' 



The few stems erect, but sometimes with a few short 



stolons from the base ... ' ' .' . , , 83, E, colo-mexicanus. 

 The earlier stems erect, the later slender-stoloniferous, 



leafy and often rooting . . , , , 34. E. flagetlaris. 

 Leaves cordate-clasping ' . 3^. E. pmladelphicus, 



RAYS INCONSPICUOUS (short sr wanting) 

 Inflorescence corymbif orm or paniculate, 



Plant3-6dm. high; stem mostly solitary , , . . , 36, E. lapiluteus; 



Plant 1-3 dm. high; stems often several . , , . . 37, E, acris. 

 Inflorescence mostly racemose; the stem or stems slender . , 38, E, lonchophyllus. 



1. Erigeron salsuginosus Gray, Proc. Am, ^cad. 16: 93, 1880. Root- 

 stocks snort and tiuckish; stems 2-5 dm. high, , the summit, of peduncles 

 lanate-pubeseent orpuberulent, no bristly or hirsute hairs: leaves very smooth 

 and glabrous or glabra te, thickish; radical and lower cauline leaves 'spatulate 

 to nearly obovate, with base attenuate into a margined petiole, 3-^7 cm. long; 

 upper cauline ovate-oblong to lanceolate, sessile, mudronate or apiculate- 

 acuminate; uppermost small and bract-like: bracts 'of the involucre loose or 

 even spreading, linear-subulate or attenuate, viscidulous or puberulous: disk 

 12-14 mm. in diameter: rays broad, giving an Aster-like effect, 50-70, purple 

 or violet, 12-15 mm, long, — On wet groimd; in the mountains of our range 

 and far northwestward. , 



la. Erigeron salsuginosus glacialis Gray, Syn, Fl, 1: 209, 1886. Lower, 

 few-leaved, often monocephalous. This and var, angustif alius grade into the 

 species, (i?. jr/octoZis A, Nels. Bot. Gaz. 37: 207. 1904.) — ^Alpine stations. 



2. Erigeron elatior (Gray) Greene, Pitt. 3: 163. 1897. Stems somewhat 

 clustered, stout, erect, 4-7 dm. high, leafy up to the monoiC?phalpus or usually 

 distinctly corymbose summit, hirsute-pubescent, the foliage scabrous: leaves 

 ovate-lanceolate, acute, entire: heads 1-8, on bracted peduncles; involucres 

 very large, often more than 12 mm. high and 15-18 mm. broad; the linear, 

 attenuate-acuminate bracts squarrose-spreading, imbedded in dense, soft 

 wool: rays showy, numerous and narrow: achenes pubescent; pappus of rather 

 firm bristles and a conspicuous outer circle of white squamellae. E. grandi- 

 florus elatior. — ^Along streams; in the mountains of our range. 



3. ErigeronCoiilteriPorter, FLCol, 61, 1874, Stems 2-5 dm. high, equably 

 leafy, bearing solitary or rarely 2 or 3 slender-pedimcillate heads: leaves 

 membranaceous, obovate to oblong, either entire or serrate with several sharp 

 teeth, pilose-pubescent to glabrous; the cauline hardly mucronate: disk about 

 12-14 dm. wide: involucral bracts less attenuate and spreading, obscurely vis- 

 cidulous but hirsute with spreading hairs: rays rather narrowly linear, 12 mm. 

 or more long, white, varying to purplish. — In the mountains of our range. 



4. Erigeron superbus Greene, ex Rydb. Fl, Col. 364. 1906. .Nearly 

 glabrous throughout, 3-6 dm. high, nearly simple and strict: leaves rela- 

 tivelv few and distant, rather large, sparsely ciliate; the basal and lower 



