Helianthus. COxMPOSIT^. 331 



than in that species, pale beneath, acute at the base, but nearly or quite sessile. 

 Heads about twice the size of tliose of H. microcephalus, of the same shape, 

 on slender peduncles; the scales of the involucre (all shorter than the disk) 

 slightly ciliate. Chafl" of the receptacle linear, entire, obtuse. Corolla of 

 the disk with a long throat, and a very short ])roi)er tube. Achenia glabrous, 

 or with a few minute scattered hairs. Intermediate scales of the pappus 

 sometimes confluent with the larger ones, all deciduous, as usual in the 

 genus. 



31. H.longifoUus (Pursh) : very smooth and glabrous; stems slender, 

 often numerous from the same root; leaves opposite or rarely alternate, 

 linear-lanceolate, acutish, entire, obscurely triplinerved, sessile; the lower- 

 most and radical tapering into slender margined petioles, rarely somewhat 

 serrate; heads few, terminating the simple or dichotomous branches; scales 

 of the involucre ovate-lanceolate ; the exterior wiih lanceolate-subulate 

 spreading tips, as long as the disk ; rays about 10, narrow ; achenia hairy at 

 the summit; pappus of 2 ovate-lanceolate concave denticulate-fringed chaffy 

 scales, and usuall}^ with two intermediate S(|uamelliB. — Pursh, ft.. 2. p. 571 ; 

 Ell.! sk. 2. p. 417. Leighia longifolia, Nalt.! in trans. A/ner. 'phil. soc. 

 {n. ser.) 7. p. 365. 



Western part of Georgia ! in wet soil. Sept.-Oct. — An anomalous spe- 

 cies, wiili the aspect of an aquatic Coreopsis, as Elliott remarks, very smooth 

 throughout. Stems 2 to 4 feet high, nearly simple. Leaves 3-8 inches 

 long, one-fourth to half an inch wide, thickish. Heads as large as in 

 H. microcephalus; the glabrous scales of the involucre somewhat fleshy, 

 appressed, except the slender herbaceous tips. Rays about half an inch 

 long. Chaff" of the receptacle narrow, glabrous, 3-toothed. Achenia gla- 

 brous, except the very summit. Pappus deciduous, as in the whole genus ; 

 the small intermediate scales frequently confluent with the larger ones. 



t Obscure or little-known species. 



32. H. paucifiorus (Nutt.) : leaves opposite, linear-lanceolate, acuminate, 

 serrate, nearly smooth ; stem naked, trichotomous, few-flowered ; scales of 

 the involucre closely imbricated, ovate. Nutt. gen. 2. p. 177. 



Lower Louisiana. — Plant 4-5 feet high. Leaves sometimes ternately 

 verticillate, very long, paler beneath and somewhat pubescent. Ray and 

 disk nearly the same' color. Nutt. — This species is unknown to us ; we And 

 no specimen in the herbarium of the Academy of Natural Sciences. 



33. U. jJumi^MS (Nutt.) : hirsutely pilose and scabrous; leaves opposite, 

 ovate-lanceolate, attenuated below, subpetiolate, nearly entire, 3-nerved ; 

 upper leaves lanceolate, alternate ; involucrum hoary, hispid, the scales im- 

 bricated, lanceolate, acute, as well as the receptacular palea?; achenium 

 smooth. — Nutt. in trans. Amer. phil. soc. {n. ser.) 7. p. 366. 



/3. / NlcoUcti : somewhat strigose-canescent : stem simple; leaves (the 

 lowest wanting) lanceolate, 1-nerved, tapering to the base, sessile, obscurely 

 serrulate ; theuppermost alternate ; scales of the involucre lanceolate or sub- 

 ulate, canescently pubescent; rays 14-20 ; pappus of 2 oblong-lanceolate 

 chatfy scales. 



Rocky Mountains of the Platte, Nuttall; who describes it as a perennial, 

 single-stemmed s])ecies, about a foot high; the leaves 2-3 inches long, about 

 aninch wide. Heads 3-5, apparently sessile. Rays 16. Chaff of the 

 achenium rather large and wide. — The var. /3. ? collected near Devil's Lake 

 in the N. W. Territory, by Mr. Nicollet, has scabrous hoary leaves, about 

 half an inch wide, and pretty large heads for the si/.e of the stem. It is per- 

 haps different from Mr. Nuttall's^aut, which is unknown to us ; but thespe- 

 ciniens are insufficient. We have seen a fragment of the same species, col- 



