168 COMPOSITiE. Erigeron. 



naked or with a f§w linear bracts ; rays twice the length of the involucre ; 

 achenia hirsute; pappus hispid-scabrous, as long as the corolla of the disk. — 

 Pursh! ji. 2. p. 535 ; Hook. ! ji. Bor.-Am. 2. p. 17 (vars. /3. &; y.) ; JSutt..' 

 in jour. acad. Philad. 7. p. 32, <^- in trans. Amer. pkd. soc. I. c. ; DC. 

 ■prodr. 5. p. 288. Cineraria Lewisii, Richards. ! appx. Frankl. jour. ed. 

 2. p. 32. 



p. smaller; leaves 3-parted; the segnaents very short, 3-lobed. — E. com- 

 positum, Hook, in Linn, trans. 14. p. 374, t. 13. 



Interior of Oregon, on the banks of the Kooskoosky ! Flat Head River ! 

 &c., and on the Rocky Mountains ! Also east of the mountains between lat. 

 64°, and the Arctic Sea, Richardson! (3. Arctic coast and islands ! June- 

 July. — Scapes 2-6 inches high, often leafy near the base. Head large ; the 

 rays white or pale pink. Bristles of the pappus about 15, with a few minute 

 interposed setaj. 



4. E. trifidum (Hook.) : hirsute ; leaves on long petioles, 3-cleft ; the seg- 

 ments short, entire, or the lateral often 2-lobed ; scapes nearly naked ; rays 

 twice the length of the very hirsute involucre ; achenia minutely hairy ; 

 pappus hispid-scabrous, as long as the corolla of the disk. — Hook. ! ji. Bor.- 

 Am. 2. p. 17, t. 120. 



Rocky Mountains, Drummond ! — Resembles the preceding; the heads 

 about the same size. Leaves slightly fleshy. 



5. E. pedatum (Nutt.) : somewhat glabrous; leaves on slender sparsely 

 ciliate-hispid petioles, 3-parted; the segments linear, obtuse, entire, or the 

 lateral 2-lobed or toothed ; scapes naked ; rays longer than the scarcely 

 hirsute involucre; achenia minutely hirsute; pappus hispid-scabrous. — 

 Nult. ! in trans. Amer. phil. soc. {n. ser.) 7. p. 308. 



Oregon, on the gravel bars of small streams to the east of Walla-wallah, 

 iVMi!toW.'— Resembles E. trifidum; but the leaves are glabrous, except the 

 strongly ciliate petioles, and the lobes more slender ; the heads are scarcely 

 half the size, and the involucre somewhat glabrous. Scapes glabrous, 2-3 

 inches high. Rays ' pale rose-color,' nearly in a single series. 



6. E. radicalum (Hook.): minutely hirsute and somewhat canescent; 

 leaves linear-spatulate, entire, rather thick or fleshy ; scapes with one or two 

 small leaves ; rays not twice the length of the toraentose or hirsute involucre ; 

 achenia minutely hairy ; bristles of the pappus few, scabrous, shorter than 

 the coro\[a.— Hook. ! Ji. Bor.-Am. 2. p. 17, t. 122 ; Nutt. ! in trans. Amer. 

 2)hil. soc. I. c. 



Near Jasper's Lake in the Rocky Mountains, Drummond! and in the 

 Blue Mountains of Oregon, Nuttall ! — Leaves nearly sessile, glabrous when 

 old, less than an inch long, clustered. Scapes 2 or 3 inches high. Heads 

 smaller than in E. uniflorum; the rays spreading, white. 



8. E. nanum (Nutt.) : canescently hirsute ; leaves narrowly linear, and 

 slightly spatulate, scarcely obtuse ; scapes naked above ; rays scarcely twice 

 the length of the hirsute-pubescent involucre ; achenia minutely hairy ; 

 pappus about the length of the corolla, hispid-scabrous. — Nutt. ! in trans. 

 Amer. phil. soc. (n. ser.) 7. p. 308. 



Rocky Mountains, in about lat. 42°, Nuttall ! — Leaves in a dense cluster, 

 1-2 inches long, scarcely half a line wide, somewhat petioled. Scapes 2-4 

 inches long, tomentose-pubescent. — " Resembles the preceding ; but has 

 hirsute leaves, and a different achenium and pappus." Nutt. 



8. E. lanatum (Hook.) : very woolly ; leaves spatulate, petioled, entire, 

 the lowermost often 3-lobed or toothed at the apex ; scapes mostly leafless ; 

 the upper portion and the involucre extremely woolly; rays elongated; 

 achenia glabrous; pappus hispid-scabrous, as long as the corolla of the disk. 

 —Hook. ! ft. Bor.-Am. 2. p. 17, t. 121 ; DC prodr. 7. {mant.) p. 275. 



