76 COMPOSITjE. LiATRis. 



is 7 or 8 inches long,) are not corymbose but simple, slender, from an inch 

 and a half to two inches in length, suberect, and each bearing 3 to 4 subses- 

 sile secund (obconic or subcylindric) capitula : the outer scales of the involu- 

 cre are less than half the length of the innermost ; their shape and the num- 

 ber of flowers in each are accurately noted by Pursh." 



§ 2. Suffruticose : branches and heads corymbose : leaves obovate, punciicu- 

 lale: scales of the few-flowered involucre few, imbricated: lobes of the corol- 

 la lanceolate: jyaj^pus unequal, barbellate. — Leptoclinium, Nult. 



17. L. fru'icosa (Nutf.) : glabrous; branches naked above ; leaves spafu- 

 late-obovate, nerveless, entire ; heads about 5-flowered ; involucre cylindri- 

 cal-campanulate, much shorter than the pappus ; the scales (12-14) lanceo- 

 late, acute, or acuminate, sprinkled with resinous globules; achenia villous- 

 pubescent. — Nutt. ! in Sill. jour. 5. p. 299, Sf in trans. Amer. phil. sac. - 

 (n. ser.) 7. p. 285. 



East Florida, Mr. Ware .' — Leaves scattered, (the lower opposite, the 

 upper alternate, JS'utt.) about an inch long, similar in shape to those of the 

 common Purslane. Scales of the involucre imbricated in about 3 series ; 

 the exterior shorter and more acuminate; the innermost a little longer than 

 the achenia, which are nearly 3 lines in length. Corolla purple. Pappus 

 longer than the achenia, of numerous rather strongly barbellate bristles, some 

 of which are much weaker and shorter than the others. — The achenia and 

 pappus exactly agree with those of L. scariosa, and are about the same size : 

 the receptacle is the same as in other few-flowered species. 



§ 3. Root a short rhizoma or caudex : leaves dilated, obovate, spatulate, or 

 lanceolate, somewhat tripli-ncrved or veined, not punctate with imjjressed 

 dots: heads corymbose or paniculate-cymose, small, few-flowered : scales of 

 the involucre few and slightly imbricated : corolla scarcely dilated above ; 

 the lobes short, ovate : pappus minutely barbellate. — Tkilisa, Cass., DC. 

 (excl. spec.) 



18. L. odoratissima (Willd.) : glabrous ; leaves somewhat glaucous, ob- 

 scurely veined; the radical ones obovaie-spaiulale, tapering at the base, often 

 slightly and obtusely toothed ; the cauline oblong, clasping at the base ; cyme 

 corymbose-jianiculate ; the heads numerous, pedicellate, 7-8-flowered ; scales 

 of the involucre spatulate-oblong, glandular ; achenia scarcely pubescent. — 



Willd.! spec. 3. p. 1637; Michx.1 fl. 2. p. 93 ; Pursh. fl. 2. p.b\Q: Nutt.! 

 gen. 2. p. 132 ; Arulr. bot. rep. t. 633 ; Ell. sk. 2. p. 283 ; DC ! prndr. 5. 

 p. 131 ; Don, in Brit. fl. gard. (ser. 2) t. 184. Anonymos odoratissimus, 

 Walt. Car. p. 198. Trilisa odoratissima, Cass. diet. 55. p. 310. 



Pine barrens, Virginia (Nnttall) to Florida! Alabama! and Louisiana! 

 Sept.-Oct. — Stem 2-4 feet high, corymbose at the summit. Leaves thick, 

 tripli-nerved, or with several veins proceeding from the midrib ; the ra- 

 dical ones large; the upper small and scattered. Flowers bright purple. 

 Achenia glandular. — The leaves when bruised exhale the odor of Vanilla, 

 which in a dry state they retain for many years; whence the popular 

 name, Vanilla-plant. 



19. L. paniculata (Willd.) : stem clothed with viscid hairs; leaves 3-5- 

 nerved, mostly glabrous; the radical ones spatulate-lanceolate, tapering into 

 a margined petiole; the cauline very small and numerous, lanceolate or 

 ovate-lanceolate, sessile, viscidly pubescent when yoimg; corymbs small, 

 numerous, aggregated into a dense oblong panicle; heads 4-10- (commonly 

 5-) flowered ; scales of the involucre lanceolate or linear-oblong, viscid ; 



