COMPOSITAE (COMPOSITE FAMILY) 525 



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

 upper sessile and becoming ovate, acute: heads few, corymbose, large: the 

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

 as are also the pedicels: rays numerous, 12-16 mm. long. Formerly referred 

 in part to E. salsuginosus and in part to E. macranthus. Colorado and 

 Wyoming to Utah. 



5. Erigeron macranthus Xutt. Trans. Am. Phil. Soc. 7: 310. 1841. Gla- 

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

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

 in length, more or less hispid-ciliolate on the margins: inflorescence corymb i- 

 form, leafy: heads 7-8 mm. high; bracts linear-subulate, acuminate, glandular- 

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

 12-15 mm. wide: rays very numerous, fully 1 cm. long. (E. salicinus Rydb. 

 Bull. Torr. Bot. Club 32: 125. 1905; E. platyphyllus Greene, Leaflets 1: 145. 

 1905.) In the mountains of our range. 



6. Erigeron speciosus DC. Prodr. 5: 284. 1836. Stem from a woody base, 

 3-5 dm. high, strict, glabrate or sparsely hirsute with rather long white hairs, 

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

 a winged petiole, which is, as well as the leaves, ciliate-margined ; upper 

 leaves lanceolate, sessile, more or less clasping: heads corymbose, 7-10 mm. 

 high and 1.5-2 cm. in diameter; bracts linear-acuminate, 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. conspicuus Rydb. Mem. N. Y. Bot. Gard. 

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



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

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

 leaves entire, thin; the basal and lower ones oblanceolate to oblong, obtuse 

 or acute, petioled; the upper lanceolate or ovate-lanceolate, sessile or some- 

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

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

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

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

 Dakota to Utah and Idaho. 



8. Erigeron as per Nutt. Gen. 2: 147. 1818. Stem simple, or branched 

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

 glabrous, pubescent, or ciliate, entire; the basal ones spatulate, obtuse, 5-10 cm. 

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

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

 several or solitary, slender-peduncled, 2-5 cm. broad; bracts linear, 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 inner. (E. glabellus Nutt. 1. c.; E. consobrinus Greene, Pitt. 3: 186. 1897; 

 E. oblanceolatus Rydb. 1. c. 24: 294; E. Earlii Rydb. 1. c. 32: 126.) Colorado 

 to Montana and extending far eastward. 



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

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

 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-pubescent, ending in few to several 

 large heads: involucre low-hemispherical, 16-20 mm. broad; the biserial equal 

 bracts with spreading green tips and with little pubescence: rays 100 or more, 

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

 mollis. E. eximius Greene; E. incanescens and E. viscidus Rydb. 1. c. 28: 23 & 

 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 branches 

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

 monocephalous, pubescent with purplish hairs: leaves numerous on the crowns, 



