GENUS 4. THISTLE FAMILY. 
16. Eupatorium perfoliatum L. 
Common Thoroughwort. Bone- 
set. Indian Sage. Fig. 4167. 
E. perfoliatum L. Sp. Pl. 838. 1753. 
Eupatorium truncatum Muhl.; Willd. Sp. 
Pl. 3: 1751. 1804. 
Eupatorium perfoliatum truncatum A. Gray, 
Syn. Fl. 1: Part 2, 99. 1804. 
: Pubescent, stout, branched above, 2°-5° 
high. Leaves opposite, or rarely in 3’s, 
connate-perfoliate, or the upper, rarely 
all, truncate and separated at the base, 
divaricate, lanceolate, long-acuminate 
with a slender apex, finely crenate-ser- 
rate, rugose and pubescent beneath, 4’-8’ 
long, 1-13’ wide; heads crowded, 10-16- 
flowered, 2-3” high; involucre cam- 
panulate, its bracts lanceolate, acutish, 
in 2 or 3 series, pubescent, the outer 
shorter; flowers white, rarely blue. 
In wet places, Nova Scotia and New 
Brunswick to Manitoba, Florida, Nebraska 
and Texas. Called also ague-weed, cross- 
wort, wild sage, thorough-wax, thorough- 
grow, thorough-stem. July—Sept. 
LF wy 
by LAW 
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iS 
A plant described as Eupatorium perfoliatum 
cunedtum Engelm., with leaves smaller, narrowed 
and separated at the base, from Arkansas and Mis- 
souri, is probably a hybrid with E. serotinum. 
17. Eupatorium resindsum Torr. Resin 
Boneset. Fig. 4168. 
E. resinosum Torr. DC. Prodr. 5: 176. 1836. 
Slender, finely pubescent and resinous, 2°-3° 
high, branched at the summit, the inflorescence 
comparatively small, 3’-4’ broad. Leaves op- 
posite, closely sessile, clasping, or slightly con- 
nate-perfoliate at the base, linear-lanceolate, 
long-acuminate, sharply serrate, 3’-6’ long, 
3’’-6” wide, roughish above, canescent beneath; 
heads 10-15-flowered; involucre campanulate, 
about 2” high, its bracts oblong, obtuse, in 2 
or 3 series, the outer shorter; flowers white. 
In wet pine-barrens of New Jersey. Aug.—Sept. 
18. Eupatorium urticaefolium Reichard. 
White Snake-root. Fig. 4169. 
i BER wag” — 
3 
3 
E. urticaefolium Reichard, Syst. 3: 719. 
1780. 
E. ageratoides L. f. Suppl. 355. 1781. 
E. boreale Greene, Rhodora 3: 83. 1901. 
Glabrous or villous and somewhat vis- 
cid, much branched, 1°-4° high. Leaves 
opposite, ovate, thin, acuminate at apex, 
rounded, truncate or cordate at the base, 
or abruptly narrowed into the slender 
petiole, coarsely and usually sharply den- 
tate-serrate, sometimes crenate, 3'-6° 
long, 17-3’ wide, 3-nerved and veiny; 
petioles 4’-23” long; inflorescence rather 
loose, ample; heads 10-30-flowered; re- 
ceptacle flat; involucre narrowly cam- 
panulate, about 2” high, its bracts linear, 
acute or acuminate, in I or 2 series, 
equal or nearly so; flowers bright white. 
IY 
Sa 
= aN 
In rich woods, New Brunswick to Flor- 
ida, Ontario, Nebraska and Louisiana. In- 
dian sanicle. Richweéed. Stevia (Wis.). 
White sanicle. Deerwort boneset. July—Nov. 
