BOTANY. 129 
EmrocoNUM ANNUUM, Nutt. in Amer. Phil. Trans. (n. ser.) 5, p. 164; Benth. Eriog. in Linn. 
Trans. 17, p. 414. Sandy river valleys, near Fort Atkinson, Arkansas river; July. 
EnrocoNUM ALATUM, Torr. in DC. Prodr. 15, (ined.) and in Sitgreaves’s Hep. p. 168, t. 8. 
Near the Rocky Mountains, on hill-sides; August. Plant 2-3 feet high. There is some mis- 
take about E. alatum, in Hook. Jour. Bot. and Kew. Gard. Misc. for September, 1853. That 
species is not enumerated in Fremont's reports, and was described for the first time in the 
report of Captain Sitgreaves, which was not published till the summer of 1853. But speci- 
mens of the plant were distributed from Fremont's and other collections, with the manuscript 
name. 
EnroaoNvuM Jamesi, Benth. in DO. Prodr. 14, (ined;) Torr. in Sitgreaves's Rep. p. 168. E. 
sericeum, Torr. in Ann. Lyc. N. York, 2, p. 241, (excl. syn.) On the Sierra San Juan; Sep- 
tember. This plant possesses considerable astringency, and is used as a remedy for diarrhoea 
by the hunters and Indians. 
ERIOGONUM CERNUUM, Nutt. in Jour. Acad. Phil. (n. ser.) 1, p. 162; Torr. in Sitgreaves’s 
Rep. l. e. This species in its early state has radical leaves only, which are clothed with a white 
tomentum, and the scape is sparingly branched. Later in the season the lower part of the 
stem or caudex, below the primary leaves, elongates and repeatedly forks, producing a tuft of 
leaves at every principal division, thus converting the scape into a leafy stem. Western side 
of the Sierra San Juan; September. Sepals white, often with a deep rose-colored midrib. 
EnroaoNUM EFFUSUM, Nutt. l. c. B. LEPTOPHYLLUM, Torr. in Sitgreaves’s Rep. p. 168, t. 10. 
Declivities of the Rocky Mountains; August. 
Var.? FOLIOSUM: branches at first woolly, but at length nearly glabrous, leafy; leaves 
crowded, linear, revolute when old, nearly glabrous; cymes small, the rays diverging, very 
short, compound; involucre campanulate, few-flowered, glabrous, acutely 5-toothed; exterior 
sepals obovate, emarginate, interior similar in form, but one-third smaller. High prairies, San 
Luis valley; August. 
ERI0GONUM LEPTOCLADON (n. sp.): stems slender, moderately branching, the internodes elon- 
gated, clothed with a deciduous woolly pubescence, nearly naked above ; leaves lanceolate-linear, 
woolly, like the stem ; inflorescence loosely paniculate, the ultimate divisions somewhat race- 
mose; involucre campanulate, woolly, 5-toothed, smaller than the flowers; calyx campanulate ; 
sepals somewhat equal, very obtuse, and slightly emarginate; filaments as long as the sepals, 
hairy nearly to the summit. Sandy soil on Green river; October. A shrub, about two feet 
high; the branches dichotomous, or sometimes trichotomous, of a greenish hue when the wool 
is detached; the ultimate divisions short, and not cymose. Involucre scarcely a line and a half 
long, few-(6-10-)flowered. Bracteoles linear, minutely glandular on the margin. Perianth gla- 
brous, obtuse at the base. Achenium with a long glabrous beak. Embryo curved, the cotyledons 
orbieular; radicle enlongated. Allied to Æ. effusum, but much more slender, and differs also 
in the inflorescence. 
ERIOGONUM corymBosum, Benth. in DC. Prodr. 14, (ined.) B. prvARICATUM: shrubby and 
much branched, clothed with a dense white tomentum; leaves oblong lanceolate, on very short 
petioles, undulate on the margin, approximated; cymes large and widely spreading, the pri- 
mary and secondary divisions trichotomous, the ultimate dichotomous; involucre oblong-com- 
panulate, obtusely 5-toothed; flowers (middle-sized) glabrous; exterior sepals broadly obovate, 
emarginate, the inner narrower and rather shorter; bracteole spatulate-linear; filaments hairy 
towards the base; ovary attenuated, glabrous; styles very long and exserted. Near springs on 
Green river; October. About a foot and a half high; leaves about three-fourths of an inch 
long, and nearly half that breadth. Perhaps a distinct species from E. corymbosum of Ben- 
tham, which, however, was founded on a specimen in Dr. Torrey's herbarium, collected by 
Colonel Fremont, very near where Lieutenant Beckwith's plant was found. 
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