SEG FS EK eS ST 
a TS aT 
598 
_ HELENIUM quadridentatum. 
Louisiana Helenium. 
—a—— 
SYNGENESIA POLYGAMIA4 SUPERFLUA. 
Nat. ord. Compositm. Adanson fam. 2. 103. 
CoRYMBIFERR. Jussiew gen. 177. Div. VI. Recept. pale- 
aceum. Semen apice dentatum aut paleaceum. Flores in plurimis radiati, 
in paucis flosculosi. Recept. HELEN subnudum. 
HELENIUM. Involucrum (cal.) simplex, polyphyllum, subaquale. 
Receptaculum hemisphericum, medio nudum, margine paleaceum. ‘Flosculi 
disci tubulosi hermaphroditi: radii feminei ligulati. aheyeers (sem.) paleis 
compluribus membranaceis coronata. Herbe foliis alternis decurrentibus : 
- floribus terminalibus corymbosis radio flavo. ‘Kunth noy. gen. et spec. pl. 4. 
299. 
H. quadridentatum, caule alato ramosissimo paniculato fastigiante, _foliis 
sessilibus obtusulis superioribus lanceolatis integris, inferioribus pinnati- 
fidis, pedunculis filiformi-elongatis, involucri (calycis) foliolis Hines 
subulatis, disco brevioribus, flosculis disci 4-dentatis. Don MSS. 
Helenium quadridentatum. ZLabillard. in act. soc. hist. nat. paris. 1. 22. t. 4. 
Michaux bor. amer. 2.133. Willd. sp. pl. 3.2121. Hort. Kew. ed. 2. 
5. 85. Pursh amer, sept. 2. 560. Willd. enum. 2. 898. Nuttall gen. 2. 
173. Smith in Rees’s cyclop. in loco. 
Rudbeckia alata. Jacq. coll. 5. 154. ic. rar. 3. t. 593. 
Herba leté virens, superne obsolete lanuginosa: radix Jibrosa annua. 
Caules erecti, teretes, bifaridm v. trifaridam alati, paniculato-ramosi, ramis 
alternis corymboso-fastigiantibus. Fol. alterna, tenuia,’ sessilia, alato-decur- 
rentia, plana, enervia, immerse puncticulata, obtusula, superiora elongato- 
oblonga acuminata integra, inferiora pinnato-incisa. Pedunculi terminales 
y. axillares, solitarit \-flori, filiformi-elongati, sulecati, obsolete villosi. 
Flores flavicantes, INULE dysenterica: subequales, erecti: \ Tnvol. (cal.) sim- 
plex polyphyllum foliolis lanceolato-linearibus scabriusculis, subduodenis 
disco breviortbus reflexis. Radius femineus flavus plurimus ad basin usque 
divaricato-rotatus contiguus, subtus obsolete lanuginosus, flosculis (12°) ses- 
silibus (absque tubo) planis oblongis cuneatis 4-fidis sepiusve trifidis, lobulis — 
obtusis: discus viridi-lutescens, hermaphvr., elevato-conicus, creberrimus, 
flsculis brevibus clavato-infundibuliformibus ; tubus brevissimus equans pap- 
pum; faux multotics longior cylindrica subdiaphana; limbus 4-partitus 
pube externd glandulosd subviscidd, laciniis ovatis pluries brevioribus 
fauce. Stam. inclusa: anth. fulvescentes valvulis minutis (42) ustulato-fuscis 
apiculate. Germ. parvum, cylindricum cuneato-oblongum hirsutins villosum 
albicans, pappo paleaceo é paleis 5 ovato-lanceolatis brevibus ; stigmata ea- 
serta, lincaria, recurva, crassiuscula, flava; (radii) glabra. Achenia (sem.) 
parva, obovata, teretia, dense pilosa, pappo paleaceo brevissimo. Recept. 
elevato-conicum, punctatum, subnudum, peripherid sold paleaceum, paleis 
linearibus. Don MSS. 
Native of Louisiana. Introduced in 1790 by Abbé 
Pourret. A handsome hardy annual, and as we have ob- 
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