386 COMPOSITE. Helenium. 



conical. Corolla of the disk brownish-purple at the apex. Achenia minute- 

 ly pubescent. Lower leaves oblong, triplinerved, tapering to the base; the 

 upper lanceolate-linear, strongly decurrent. 



H. Mcxicamim (H. B. &; K.) is said by Nuttall (in trans. Amcr. phil. soc. I. c.) to 

 have been collected in Louisiana by Mi-. Teinturier. We have seen no specimens 

 which accord with the Mexican plant. 



H. lon<;ifolim?i (Smith) : leaves linear-lanceolate, entire, very smooth ; peduncles 

 naked, elongated. Smith in Rces, cycl. H. autumnale. Mill. diet. ed. 8, ex Smith. 



H. pumilum of Willd. {Enum. suppl. p. 60,) of unknown origin, is at present 

 not known either in the Berlin Garden or in the herbarium of Willdenow. 



H. quadripariitum (Link, enum. 2. p. 338) is probably a state of H. quadri- 

 dentatum. 



H. allissimum of Link, is described in the Index Seminum of the Berlin Garden 

 for 1840 (fide Linnfea, 15. suppl. p. 83) from a plant raised from seeds sent by Dt, 

 Engelmann of St. Louis : we have not seen the description. 



H. commidatum, Link, 1. c. is also said to be a new species from North America. 



128. LEPTOPODA. Nutt. gen. 2. j??. 174 ; Ell. sTc. 2. p. 445. 



Heads many-flowered, radiate ; the ray-flowers in one or more series, ligu- 

 late, cuneiform, 3-4-cleft at the summit, nearly or quite destitute of tube, 

 neutral. Scales of the involucre in 1-2 series, spreading or reflexed ; the 

 exterior numerous, foliaceous, lanceolate-subulate ; the inner very short, 

 chaffy. Receptacle conical or hemispherical, naked, areolate ; the areolae 

 becoming fleshy. Corolla v/ith a short narrow tube, and an elongated cylin- 

 draceous 4-5-toothed throat; the teeth sliort and obtuse, glandular-bearded. 

 Branches of the style short, slightly dilated and truncate at the apex. Ache- 

 nia short, truncate at each end, somewhat cylindrical or turbinate, many- 

 striate. Pappus of G-12 (rarely 5) membranous and silvery oblong 

 (mostly nerveless and awnless) scales, denticulate, lacerate, or fimbriate, 

 longer than the achenia. — Perennial (North American) herbs, with the habit 

 &c. of Helenium ; but usually with simple fistulous stems, naked above, 

 and terminated by a solitary large head. Flowers of the ray and disk yel- 

 low or sometimes brownish-purple, sprinkled with resinous globules; the 

 former mostly pubescent externally. 



The first section of the genus is somewhat peculiar in habit : the second is only 

 to be distinguished from Helenium by its neutral rays. 



§ 1. Stems mostly sinijyle, naked at the summit, and terminated hy a single 

 large head : rays numerous (12-40), spreading : p)o.ppus awnless : pedun- 

 cle commonly dilated or ohconical under the head. — Leptopoda proper. 



* Achenia glabrous, glandular-dotted : scales of the pappus slightly thickened or obscure- 

 ly nerved at the base. 



1. L. Helenium (Nutt.) : glabrous, or when young sometimes pubescent 

 at the summit; leaves lanceolate or linear-lanceolate, elongated, entire, or 

 often denticulate, mostly decurrent; the radical and lowermost tapering into 



