BBACHVACTIS COMPOSITE 315 



ERIGERON 



into winged petioles, often ciliate : heads numerous, hemispherical, 4 lines 

 high: bracts of the involucre oblong, obtuse, herbaceous: rays a line long, 

 pinkish-purple exceeding the involucre but shorter than the pappus ; 

 achenes narrow, appressed-pubescent. Muddy saline flats and margins of 

 ponds, Washington to California, New Mexico and the Rocky mountains. 



21 ERIGERON L. Gen. n 3 951. 



Herbs or rarely suffrutescent plants with entire, toothed or 

 lobed leaves and solitary, corymbose or paniculate heads of vari- 

 ous colored ray-flowere. Heads mostly hemispherical, many 

 flowered : the ray flowers very numerous and usually in more 

 than one series (sometimes wanting), pistillate those of the disk 

 tubular, perfect, or some of the exterior filiform- tubular and trun- 

 cate, pistillate. Bracts of the involucre mostly equal, narrow, in 

 a single or somewhat double series. Receptacle flat, naked, 

 punctate or scrobiculate. Appendages of the style very short 

 and obtuse. Achenes compressed, usually pubescent, commonly 

 with 2 lateral nerves. Pappus a single series of capillary scab- 

 rous bristles, rather few in number, often w r ith minute setae inter- 

 mixed or forming an indistinct outer series, or sometimes with 

 a distinct and short squamellate-subulate or setaceous exterior 

 pappas, the inner rarely wanting in the ray. 



§ 1 Euerigerox DC. Gray Syn. Fl. Pt. 2, 207. Rays 

 elongated and conspicuous, or in a few species uniformly want- 

 ing, in one or tw r o occasionally abortive : no rayless pistillate 

 flowers between the proper ray and disk. 



* Perennials, commonly dwarf, from a multicipital caudex, alpine or 

 alpestrine with comparatively large and mostly solitary heads : invol- 

 ucre loose or spreading, and copiously lanate with long multiseptate 

 hairs. 



E. unifloms L. Fl. Lapp. t. 9, f. 3. Stems 1-2 inches high or moe 

 strictly monocephalous, few-leaved, oiten naked and pedunculiform at 

 summit: radical leaves spatulate or oblanceolate, 1-2 inches long: cauline 

 lanceolate to linear: involucre usually hirsute as well as lanate occasion- 

 ally becoming naked, the linear acute bracts rather close, or merely the 

 short tips spreading : rays purple or sometimes white, 2-4 lines long. In 

 Labrador to the Arctic coast and Unalaska, south to the Sierra Nevada3, 

 California and the Rocky mountains. 



E. lanatus Hook. Fl. ii, 17, t. 121. Stems 8-10 inches high from a mul- 

 ticipital caudex, scapiform or few-leaved, monocephalous: radical leaves 

 spatulate to obovate, about half-inch long tapering into a narrowed base 

 or into a slender margined petiole ; some primary ones occasionally pal- 

 mately 3-lobed ; cauline one or two small andlaner, or hardly any: involu- 

 cre densely soft-lanate: the linear acute bracts rather close or merely the 

 short tips spreading: rays 3 lines long, white. In the Cascade mountains 

 of Washington to the northern Rocky mountains. 



E. grandiflorus Hook. Fl. ii, 18, t. 123. Stems 8-20 inches high, 

 rather stout, usually several-leaved and monacephalous : radical leaves ob- 

 ovate-spatulate' 1-3 inches long; cauline oblong to lanceolate, 4-6 lines 

 long: involucre half inch high, very woolly, its linear and attenuate-acumi- 

 nate bracts squarroses-spreading or the tips recurved : rays violet or pur- 

 ple, 4-6 lines long. Rocky mountains from British Columbia to Colorado. 



