COMPOSlTAE (COMPO&ITE FAMILY) - 525 



cauline tapering into a petiole from an elliptic pr oblanceolate blade; the 

 upper sessile land ibecommg ovate, acute: iheads few, corymbose, large: the 

 involucre 12-16 mm. broad, slightly hirsute at base only, obscurely i glandular 

 as are also the pedicels: rays numerous, 1^16 mm. long..; Formerly referred 

 in plart to:£.. salsvginosiis and in part to E. maerarUhuSy — Colorado a.nd 

 Wyoming to tltah. , , 



5. Erigeroa macranthus Nutt/ Trans. Am. Phil. goo. 7:, 310,, 1841. Gla- 

 brous or sparingly strigiUose, above, the stem leafy, 4-8 dm. high:. leaves from 

 oblanceolate below >to eUiptic-oblong and oval above, 8 cm. to less than 3 cm. 

 in length, more or less hi^pid-ciliolate on the margins: inflorescence corymbi- 

 fonn, leafy: heads 7-8 mm.. high;. bracts linear-subulate, acimiinate, glandular- 

 puberulent, not at all hirsute, in 2 series but almost equal and crowded : disk 



]|12-1S mm. wide: rays very numerous, fully 1 cm. long. {E. salicinus Rydb. 

 Bull. Torr. Bot. Club 33: 125. 1905; E. platypkyUiis, Greene, Leaflets 1: 145. 



11905.)-'— In the moimtains of our range. , t. . r,,,, 



i, .6. Erigeroa.speciosus DC. Prodr. S:- 284. 1836. Stem fromia woody, base, 



'.8-5 dm. high, strict, glabrate or sparsely hirsute with rather long white hairs, 

 leafy toithe top: lower leaves oblanceolate, 5-10 cm. long, acute, tapering into 

 a -mhged petiole, which. lis, as well as the leaves, ciUate-margined; upper 

 leaires. lanceolate, sessile^, more or less clasping: heads corj^mbose, 7-10 mm. 

 ihigh and 1.5-2 cm. Jn.diaBieter; bracts linear-aciiminate, minutely glandular 

 and somewhat hirsute: rays blue or violet, very numerous, rather narrow, 

 12-18 mm. long: achenes strigose; pappus double, the outer of few short 

 setose-squamellate hairs. (E. conspicfuvs Rydb. Mem. N. Y. Bot. Gard- 

 1: 400. 1900.) — In the mountains; Colorado to Montana and Washington. , 



; 7j Erigeron subtrinervis Rydb. Mem. Torr, Club 5: 328. 1894. Similar to 

 the preceding species, finely pubescent; stems leafy to the inflorescence: 

 leaves. entire, thinj the basal and lover ones oblanceolate to oblong, , obtuse 

 oracutei, pfetioled; the upper, lanceolate or ovate-lanceolate, sessile or some- 

 what clasping, acute, rather distinctly 3-nerved: heads 25-35 .mm.~ brqad, 

 corymbose, or rarely solitary: rays numerous, blue to pink: pappus double, 

 the outer bristles, very short.' (JE. striaius Greene, as to our range; E. Vree- 

 landii Rydb. Bull. Torr. Bot. Club 32: 125. 1905.)— From Colorado and South 

 Dakota toiilltah and Idaho; " 



. 8. lErigsoxHa asperi.Nutt. Gen. 2: 147. 1818. Stem simple, or branched 

 abdvej more or less pubescent, sometimes hirsute, 1.5-6 dm. high: leaves 



.• lglabroii8,i pubescent,! or eiliate, entire; the basal ones spatulate, obtuse, 5-10 cm. 



ilong, !6-25 mm., wide, narrowed into margined petioles; stem leaves oblong- 

 lanceolate or linear-lanceolate, obtuse or acute, the upper smaller: heads 



(Several or sohtary, slendej^rpeduncled, 2-5 cm. broad; bracts hnear, acute, 

 hirsute or pubescent: rays 100^150, very narrow, violet, purple, or white, 



.'8^14 mm. long: pappus double, the outer row of bristles much shorter than 

 the innen (^^ glabdlus 'Nntt. I. c; E. consobrinus, GreenefFitt.S: 186. 1897; 

 E. oblaitgeolatus Rydb'. 1. c. 24: 294; E. Earlii Rydb. 1. p. 32: 126.)— Colorado 

 to Montana and extending far eastward. 



9. Erigeron fonnosissimus Greene, Bull. Torr. Bot. Club 25: 121. 1898. 

 Perennial, somewhat tufted, 3-5 dm. high, the stems erect or at base sUghtly 

 decumbent: basal leaves oblanceolate, obtuse, entire, 1-nerved, 6-12 cm. long, 

 including the long, winged petiole, green and glabrous or cinereous-pubescent, 

 ciliolate-margined; those of the stem 2-4 cm. long or more, oblong-lanceolate, 

 acute* sessile:. stem somewhat hirsute-pubesceint, ending in. few_ to several 



.--largie heads: involucre loW-hemispherical, 1,6^20 mm- bfpad; the bigerial equal 

 braots^with spreading green tips and with little pubescence; rays 100 or more, 

 narrow, almost 18 mm. long, light rose-color to deep purple. i,E. glabellus 

 mollis. E. eximius Greene; E. incanescens and E. visciihts Rydb. I. c. 28: 23 & 



I 24. 1901.)— Throughout our range. 



10. Erigeron melanocephalus A. Nels. Bull. Torr. Bot. Club 26: 246. 

 1900. Caudex thick and nearly simple or more or less branched, the bra,nches 

 short; stems few to several (often 10 or more), slender, erect, 5-15 cm. high, 

 monocephalous, pubescent •vrith. purplish hairs: leaves numerous on the crowns, 



