258 DESCRIPTION OF ASTERS ; CURVESCENTES 
umbelliform, decompound; sinus of the lower leaves rather dee 
and narrow. In grassy woods and thickets, Conn., and to Virginia." 
Stem terete, non-flexuose. Radicals 1, sometimes 2, wit 
very long, erect petioles, twice the leaf-length, even 12 in. long. 
Leaves thin, firm, light green, satiny, smooth and glabrous in 
growth, and remaining smooth when dry, except sometimes the 
very lowest leaves. Leaf-form cordate acuminate, or cordate with 
abruptly short caudate apex ; middle caulines large, ovate-acumi- 
nate with broad wing ; upper caulines and axiles oblong-lanceo- 
late, rounded into a short, broad wing. Rameals often large, 
2 x 14 in, or less, lance-oblong, sessile; in extreme cases about 
3 such, an inch apart, crown the top of the long smooth branch, 
naked for 7 inches below. 
Teeth of serrate type, fine and regular, shallow, nearly straight. 
Inflorescence decomposite, its numerous branches each bearing 
an umbelliform cluster with radiating pedicels or in some clusters 
resuming the corymbose type by developing short internodes. 
The total inflorescence in small plants has a shallow convex top 
about 5 in. broad ; in large plants a loose rounded dome, 10 in. or 
more across. 
Pedicels very slender, often 17 in. long; lateral buds of each 
cluster are apt to be sessile for some time, the pedicel often de- 
veloping so much later as to make the whole cluster half-circular 
when fully in flower. 
Rays 8, tapering slightly to the 3-toothed apex ; a little more 
so to the base. Disk-flowers about 25, becoming rdi cen -brown, 
taper-funnelform, the short lobes forming not over 2 of the body. 
Achenes smooth and even, fusiform, dark greenish brown, with 
double striae, with a white terminal ann ulus which is decurrent on the 
striae and thus becomes triangularly denticulate downward. Recep- 
tacle foveolate, developing conical tubercles, on which the achenes 
were seated ; but alveolae and fimbriae are obsolescent or absent. 
mong allies which bear somewhat similarly umbelliform 
branches, A. améiguus is smaller and more slender, A. Claytont 
very much shorter; A. curvescens only produces similarly con- 
spicuous colonies of broad radicals, and differs in darker, harsher 
leaves, more predominantly curvescent teeth, narrower rays, etc. 
A. limicola sometimes grows near, but differs in leaf-form, ciliate 
petioles, larger, rougher, thinner, more numerous radicals, crenate 
teeth and later blossoming. 
Habitat, wet woods and river banks, Mass. and Ontario to Va. 
and Illinois, late July. 
Examples : 
Ms. Montague, July 25, '87, and Au. 6,'87, Walter Deane in hb. 
Ontario, Welland, July 12, 1901, Macoun in hb. N. Y. Bot. Gar. 
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