80 COMPOSITiE. Brickellia. 



nearly cylindrical, about 10-striale. Pappus a single series of slender sca- 

 brous or minutely barbellate-serrulate bristles. — Perennial herbs (natives of 

 the Southern United States and Oregon), sparingly branched ; with opposite 

 or alternate tripii-nerved leaves, and rather large corymbose heads. Flowers 

 pale purple. 



§ 1. Leaves mostly opposite, cordate, crenate, petioled, 3-nerved from the base, 

 veiny : involucre rather shorter than the flowers. 



1. B. cordifolia (Ell. 1. c.) : stem paniculate-corymbose at the summit ; 

 leaves all opposite, somewhat triangular-cordate, acuminate, minutely pu- 

 bescent anil thickly dotted with resinous globules beneath, crenale-tooihed ; 

 corymb loose, the branches bearing 1-3 pedunculate heads; bracts setaceous ; 

 scales of the involucre rather rigid; the outermost subulate, loose or bracteo- 

 late, somewhat shorter than the obtuse oblong-linear imbricated interior 

 ones ; branches of the style much exserted ; achenia nearly glabrous ; pap- 

 pus (purplish) persistent. — Eupatorium Brickellia, DC. prodr. 5. p. 182. 



Hill-sides, western districts of Georgia, Elliott. Middle Florida, Dr. 

 Chapman ! Aug.-Sept. — Stem about 3 feet high, terete. Leaves about 3 

 inches long ; the uppermost merely truncate at the base. Heads half an 

 inch long, 40-5()-flowered. Style with a depressed villous bulb. Achenia 

 •when young minutely hairy towards the summit. 



2. B. grandiflora (Nutt.): stem paniculate at the summit; leaves cordate- 

 triangular, acuminate, pubescent or nearly glabrous, dotted with resinous 

 globules beneath, coarsely or incisely dentate-serrate ; the lower mostly op- 

 posite, the others alternate; heads subses'iile and glomerate (3—5 together) on 

 the simple branches of the panicle; scales of the involucre imbricated in 

 several series; the inner ones linear-oblong, rather acute; the exterior short, 

 ovate, appressed, produced into a subulate spreading appendage; branches 

 of the style slightly exseried; achenia glabrous when mature; pappus 

 (white) deciduous. — Nutt.! in trans. Anier. phil. soc. {n. ser.) 7. p. 287. 

 Eupatorium? grandiflorum, Hook. fl. Bor.-Am. 2. p. 26. 



Low hills between the north and south branches of Lewis & Clarke's 

 River, Oregon, Douglas; and from this region to the Rocky Mountains, 

 Nuttall! Upper plains of the Platte? Dr. James! — Manifestly allied to 

 the preceding species; the heads about the same size. Flowers white, ac- 

 cording to Hooker; but evidently tinged with purple in the specimen of Dr. 

 James. 



§ 2. Leaves all alternate, oblong-lanceolate, small, sessile, not sprinkled with 

 resinous dots, obscurely tripii-nerved, entire: inner scales of the involucre 

 longer than the flowers. 



3. B. oblongifolia (Nutt.) : slightly viscid-puberulent ; leaves nume- 

 rous, narrowly oblong, mucronulate, tapering to the base, scarcely veined ; 

 heads solitary or 2-3 together, terminaiing the corymbose-paniculate 

 leafy branches; scales of the involucre imbricated in 3 or 4 series ; the exte- 

 rior shorter, lanceolate-oblong, often obtuse; the interior linear, elongated, 

 acute or mucronate; branches of the style scarcely exserted ; achenia slen- 

 der, minutely puberulent. — Nutt. ! I. c. 



Gravel bars of the Oregon and Wahlamet, Nut/all! — Leaves about an 

 inch long. Heads 8-10 lines in length. Habit different from the other spe- 

 cies. The plant is viscid, and has a heavy odor, according to Nuttall; who 

 states that the flowers are yellowish [ochroleucous?]. 



