1168 CARDUACEAE 
24. Eupatorium Mohrii Greene. Similar to Æ. leucolepis in habit. Stems slightly 
more coarsely pubescent : leaves spreading or the lower ones drooping ; blades 2-6 cm. long, 
serrate, prominently 3-ribbed beneath : involucre 6-7 mm. high; bracts densely pubescent, 
the inner minutely awn-tipped : achenes 2.5 mm. long. 
In sandy soil, South Carolina to Florida and Louisiana. Summer and fall. 
25. Eupatorium álbum L. Dull green. Stems 3-9 dm. tall, rather harshly pubes- 
cent: leaves opposite; blades oblong to lanceolate, 3-10 cm. long, usually acute or acutish, 
serrate, prominently nerved beneath: corymbs 5-15 cm. broad: heads numerous: in- 
volucres narrow, 8-9 mm. high, about 5-flowered ; bracts subulate-lanceolate to linear, 
acuminate, the inner with white or whitish scarious tips: corollas white: achenes 3 mm. 
long, sometimes sparingly glandular. 
In sandy soil, New York to Florida and Louisiana. Summer and fall. 
26. Eupatorium petaloideum Britton. Bright green. Stems 3-7 dm. tall, rough 
with rather rigid hairs: leaves mainly opposite; blades oblong to lanceolate, 2-8 cm. long, 
obtuse or acutish, bluntly serrate or crenate-serrate, except the entire cuneate base, often 
pubescent on the nerves beneath: involucres trumpet-shaped, 9-10 mm. high; bracts 
various, the outer nearly linear, abruptly acute, the inner white, petal-like and conspicu- 
ous, mucronate, spatulate: corollas white: achenes nearly 3 mm. long, almost glabrous. 
In dry pine lands, Florida. Summer and fall. 
27. Eupatorium verbenaefólium Michx. Finely pubescent. Stems 6-12 dm. tall, 
branching above : leaves opposite, few ; blades ovate to lanceolate, 2-12 cm. long, acute or 
rather obtuse, serrate, rounded or truncate at the base, sessile: heads in rather dense 
cymules : involucres 4-5 mm. high ; bracts oblong-lanceolate to linear, acutish, canescent : 
corollas white or nearly so: achenes 2 mm. long, sparingly glandular. [Æ. teucriifolium 
Willd.] 
¿In sandy soil, Massachusetts to Florida and Louisiana. Summer and fall. 
28. Eupatorium rotundifdlium L. Tomentulose. Stems 3-12 dm. tall, corymbosely 
branched above: leaves opposite; blades suborbicular to orbicular-ovate, 2-4 cm. long, 
obtuse or acutish, crenate or crenate-dentate, truncate or subcordate at the base, the lower 
ones sometimes incised : involucres 5-6 mm. high; bracts lanceolate to linear, acutish or 
apiculate, scarious-margined, canescent: corollas white: achenes about 2.5 mm. long, 
glandular. 
In pine lands, New York to Arkansas, south to Florida and Texas. Summer and fall. 
29. Eupatorium pubéscens Muhl. Canescent-tomentulose. Stems 3-15 dm. tall, 
corymbosely branched above : leaves opposite; blades ovate, 2-10 em. long, acute, serrate 
or incised-serrate, rounded or truncate at the base, sessile: involucres 5-6 mm. high; 
bracts lanceolate to linear, canescent, acute, scarious-margined : corollas white: achenes 
2-2.5 mm. long, glandular. 
In sandy soil, Massachusetts to Florida and Alabama. Summer and fall. 
30. Eupatorium scábridum Ell.  Canescent-tomentulose. Stems 4-12 dm. tall, 
corymbosely branched above: leaves opposite; blades elliptic to ovate-elliptic, 2-8 cm. 
long, acute, serrate or incised-serrate, except the cuneate base, sessile or nearly so: heads 
numerous : involucres less than 4 mm. high ; bracts oblong-lanceolate to lanceolate, acute 
or acuminate, canescent: corollas white : achenes 2 mm. long, quite glandular. 
In dry soil, South Carolina to Florida. Summer and fall. 
31. Eupatorium sessilifdlium L. Tomentulose above. Stems 4-15 dm. tall, corym- 
bosely branched above: leaves opposite, spreading ; blades broadly lanceolate to linear- 
lanceolate, 8-20 cm. long, attenuate, serrate, except the rounded base and the slender 
apex, sessile: heads numerous: involucres 4-5 mm. high ; bracts ovate-oblong to oblong 
or linear-oblong, obtuse, minutely pubescent, the inner ribbed : corollas white or pinkish : 
achenes 3.5 mm. long. 
In rocky soil, Massachusetts to Illinois, south to Georgia and Alabama. Summer and fall. 
32. Eupatorium Chapmánii Small. Tomentose above. Stems 4-12 dm. tall, 
corymbosely branched, sometimes extensively so : leaves opposite ; blades firin, oblong to 
oblong-ovate, 2-10 em. long, merely acute, crenate, glandular as well as tomentose De 
neath, sessile and partly clasping: heads numerous: involucres cylindric, 5 mm. high ; 
bracts mainly linear, pubescent, rather acute : corollas white: achenes 2 mm. long. 
In sandy soil, Florida. Summer. 
33. Eupatorium cuneàtum Engelm. Tomentose above. Stems 5-16 dm. tall, 
corymbosely branched : leaves opposite or mainly so; blades lanceolate or oblong-lanceo- 
late, 1-2 dm. long or shorter near the top of the stem, acuminate, finely and evenly cren- 
