CARDUACEAE 1167 
blades linear, 2-6 cm. long, acute, sometimes undulate: heads numerous, sometimes very 
numerous : involucres 5-6 mm. high ; bracts oblong to linear or linear-lanceolate, canes- 
cent and glandular, obtuse or apiculate: corollas white: achenes 2.5-3 mm. long. 
In sandy soil, Massachusetts to Florida and Mississippi. 
15. Eupatorium Torreyànum Short. Finely pubescent. Stems 4-8 dm. tall, corym- 
bose above: leaves mainly opposite, spreading or ascending, small ones clustered in the 
axils of the larger ; blades broadly linear to oblong-lanceolate, coarsely serrate or laciniate, 
prominently nerved beneath : involucres 4.5-6 mm. high ; bracts oblong or ovate-oblong to 
linear, scarious-margined, obtuse: corollas white: achenes 3 mm. long, sparingly glandu- 
lar. [E. hyssopifolium var. laciniatum A. Gray. } 
In sandy soil, Pennsylvania and Kentucky, Florida and Tennessee. 
16. Bupatorium recürvans Small. Similar to E. Tovreyanum in habit, but usually 
smaller. Stem often slender: leaves recurved or reflexed ; blades narrowly oblong to 
lanceolate, 1.5-4 cm. long, coarsely toothed: involucres 3-3.5 mm. high: achenes about 2 
mm. long. 
In pine lands, Georgia and Alabama to Florida. 
17. Eupatorium anómalum Nash. Tomentulose. Stems 8-15 dm. tall, branching 
above: leaves opposite, small ones clustered in the axils of the larger; blades ovate-lance- 
olate to ovate, 3-7 em. long, acute, rather coarsely and sharply serrate : involucres narrow, 
5-6 mm. high, 5-flowered ; bracts linear-lanceolate to linear, pubescent and somewhat 
glandular, acute or acutish, scarious-margined : corollas white: achenes 2.5 mm. long, 
glandular. 
In sandy soil, Florida. 
18. Eupatorium lancifólium (T. & G.) Small. Similar to E. semiserratum in habit, 
but more slender, the stem from the base to the inflorescence, or near it, and leaves glabrous: 
leaves spreading; blades linear-oblong, 2-5 cm. long, acute or acutish, shallowly but 
markedly toothed at least above the middle, prominently 3-ribbed from near the base: in- 
volucres about 3 mm. high: achenes 2-2.5 mm. long. [E. parviflorum var. lancifolium 
Tx GS] 
In dry soil, Louisiana and Texas. 
19. Eupatorium semisérratum DC. Tomentulose. Stems 5-12 dm. tall, branched 
above : leaves rather numerous ; blades oblong toelliptic, sometimes narrowly so, 3-10 cm. 
long, acute, sharply serrate, especially above the middle, prominently nerved beneath : 
heads numerous: involucres 3-4 mm. high; bracts oblong-ovate to linear, obtuse, canes- 
cent: corollas white or pinkish: achenes about 2 mm. long, minutely glandular. 
In sandy soil, Virginia to Missouri, south to Florida and Texas. 
20. Eupatorium altissimum L. Hoary-tomentulose. Stems 8-20 dm. tall, branch- 
ing above: leaves numerous ; blades linear-lanceolate, to linear-elliptie, often very nar- 
rowly so, acuminate at both ends, sharply serrate above the middle or the upper ones 
entire, conspicuously 3-nerved: heads very numerous, usually crowded: involucres 5-6 
mm. high; bracts oblong, canescent, obtuse, scarious-margined : corollas white : achenes 
3.5 mm. long, minutely glandular. 5 
In dry soil, Iowa to Pennsylvania, North Carolina and Texas. 
21. Eupatorium tortifdlium Chapm. Tomentulose above. Stems 3-7 dm. tall, 
branched above : leaves numerous, opposite and alternate ; blades spatulate, oblanceolate 
or nearly linear, 1-3 cm. long, obtuse or acutish, vertical, the lower ones often reflexed : 
heads often crowded : involucres 4-5 mm. high ; bracts linear-oblong to linear, obtuse or 
acute, hairy: corollas white: achenes 2.5 mm. long, glandular. 
In sand, South Carolina to Florida and Alabama. 
22. Eupatorium cuneifdlium Willd. Tomentulose above. Stems 4-8 dm. tall, 
branching above: leaves rather numerous ; blades cuneate, oblong-cuneate or linear-ob- 
long, 1-3 cm. long, obtuse, serrate beyond the middle, or the upper ones entire: heads 
numerous: involucres 5-7 mm. high ; bracts lanceolate to linear-oblong or linear, obtuse 
or acutish, with scarious margins and apex: corollas white: achenes nearly 3 mm. long, 
glandular. 
In sand, South Carolina to Florida and Alabama. Summer and fall. 
23. Eupatorium leucdlepis T. & G. Rough pubescent or tomentulose above. 
Stems 3-8 dm. tall, corymbosely branched above : leaves mainly opposite ; blades linear to 
lanceolate, 3-7 cm. long, acute, remotely serrate or nearly entire, l-ribbed, scabrous: 
heads mostly few: involucres 6-7 mm. high ; bracts lanceolate to linear, acuminate, canes- 
cent, the inner with scarious tips: corollas white : achenes 2.5 mm. long, glandular. 
In low pine lands, New York to Florida and Louisiana. Summer and fall. 
