320 COMPOSITiE. Helianthus. 



5. H. debilis (Nutt.) : somewhat scabrous ; stem slender, clecurabent, 

 branchin,2; ; leaves alternate (rarely opposite), deltoid-ovate, mucroiiate-acute 

 or acuminate, repand-serrulate, on slender petioles ; heads (very small for 

 this division) solitary, on slender terminal peduncles ; scales of the involucre 

 narrowly lanceolate, attenuate-acuminate, achenia pubescent; pappus of 2 

 minutely pubescent small chalFy awns. — Nutt. ! in trayis. Ainer. phil. soc. 

 (n. ser.) 7. p. 367. 



/?. stem mostly simple, ascending; lower leaves frequently opposite. 



Coast of East Florida, Baldwin! B. Sand hills of Western Louisiana 

 and Texas, Dr. Leavenworth .' — The root of the Florida plant is unknown; 

 but that of 13., which scarcely ditTers except in the simple stem (1-2 feet 

 long), and a little more attenuate leaves (1^ inch in length), is annual. In- 

 volucre about half an inch in diameter. Chaft'of the receptacle 3-lobed; the 

 middle lobe cuspidate-acuminate. Rays 10-14. 



* * Perennial: heads small: rays 12-24; receptacle convex: scales of tlte involucre, 

 irregularly imbricated, narro^o, at length squarrose, as long as the dark purple disk : 

 leaves opposite, alternate, or scattered, linear, \-7icrvcd. — Angustifolii, 



6. H. a7igusfifolius {hiim.) : stem scabrous or hairy; leaves linear, elon- 

 gated, sessile, entire, with revolute margins, 1-nerved, scabrous above, pale 

 or whitish, and often pubescent or hirsute beneath ; the lower opposite, the 

 upper alternate ; heads on slender peduncles, somewhat corymbose; scales 

 of the involucre narrowly lanceolate, acute, squarrose in fruit ; chaff of the 

 receptacle cuneiform-oblong, 3-toothed ; achenia glabrous; pappus of 2 small 

 chaffy awns.— Linn. ! spec. 2. p. 906 ,• Wtdt. Car. p. 216 ; Michx.! fi. 2. 

 p. 141 (chiefly); Pursh, fl. 2. p. 572; Ell! sk. 2. p. 415; Bot. mag. t. 

 2051; Bart. fl. Amer. Sept. t. 105; DC! prodr. 5. p. 587. H. foliis 

 linearibus, & Coreopsis foliis linearibus, &c. Gronov. ! fl. Virg. " Coreopsis, 

 Mdl. ic. t. 224, /. 2." C. angustifolia, Linn. spec. ed. 1. Rudbeckia an- 

 gustifolia, Linn.! spec. {ed. 2) 2. p. 1281. Leighia bicolor, Cass. 



Damp pine barrens &c. New Jersey! to Florida ! Alabama ! Kentucky! 

 Louisiana ! and Texas ! common. Aug.-Oct. — Stem 2-6 feet high, slender, 

 simple or branched. Leaves 2-6 inches long, 2-4 lines, or the lower half an 

 inch wide, with a prominent midrib. Involucre somewhat scabrous or hairy. 

 Rays 12-20, nearly an inch long. Lobes of the disk-corolla brownish purple. 

 Pappus shorter than the achenia. 



7. H. orgyalis (DC.) : stem tall, very smooth; leaves alternate, sessile, 

 linear [very narrow], flat, scarcely denticulate, 1-nerved, slightly if at all 

 scabrous; heads 5-7, corymbose, on long peduncles ; scales of the involucre 

 linear, acuminate, ciliolate; chaff of the receptacle linear-subcuneiforin, en- 

 tire, somewhat ciliate at the apex ; achenia glabrous, 2-3-4-awned. DC. ! 

 not. 7. p>l. rar. Genev. p. 12, S^' prodr. 5. p. 587., excl. syn. 



Arkansas, Mr. Pourtales : cultivated in the Geneva Botanic Garden ! — 

 Stem 6-10 feet high. Leaves very numerous and narrow, 3-6 inches long, 

 1-2 lines wide; the lower remotely denticulate. Heads rather large. Scales 

 of the involucre lax, very slender, attenuate-subulate, longer than the disk. 

 Rays about 15, an inch or more in length. Pappus of chafiy scales rather 

 than awns, usually 2 large and 2 smaller ones, but the latter are sometimes 

 wantino- or confluent with the larger. — This is not the H. angustifolius of 

 Linnffius. The H. giganteus jS. crinitus, Nutt. gen. 2. p. 127, i)erhaps be- 

 loncrs to this sjiecies, in which case its geographical range extends to the 

 Missouri: but we find no specimen of Mr. Nuttall's plant in the herbarium 

 of the Academy of Natural Sciences. 



* * * Perennial .- rays rarely none ; receptacle convex : sccdcs of the hemispherical ivr- 

 volucre regularly imbricated, appresscd, ovate or lanceolate, destitute of foliaceous tips 



