Helenium.] COMPOSITE. 3 j 7 



H. scabws(BUS, L'Herit. (Mothia CaroUniensiSy Lam. HI. t. 667.) where the flowei*s are suhcorymbose, the 

 leaflets of the involucre very broad, the upper part of the corolla campanulate, and the pappus extremely 

 short. 



2. H* fiUfolius ; lana alba decidiia tomentosus, ramis paniculatis sparsis, foliis bipinnati- 

 fidis segmentis filiformibus elongatis integerriinis, floribus solitarils, involucri foliolis sub- 12 

 ellipticis pubescentibus capitulo subbrevioribus, corollae tubo snperne campanulato, pappo 

 brevissimo. — H. tenuifolius. DouyL MSS. apud. Herb, Hort Soc. Lond. (non Pursh.) 



Hab. On the undulating arid grounds of the Columbia, near the Wallawallah, and on the hanks of the 

 Spokan and Flat-head Rivers. — 18 inches to two feet hig^h, the stem loosely panicled above. This is quite 

 different from the H. tenuifoUiis of Pursh, of Mhich I possess a specimen from Mr. Nuttall, gathered on the 

 Arkansa. That has a remarkably dense corymb of flowers, whereas here the branches form a lax terminal 

 panicle, each elong-ated extremity bearing a solitary flower. The pappus is extremely minute. 



38. PICRADENIA. Nov. Gen, 



Radius 8-10 florus, foemineiis, corollis obovato-oblongis grosse tridcntatis. Palcce pappi 

 6-7 sublnibricatie, ovatse, acuminatlssimse, nudse, Achenium villosum. Rachis conica, 

 nuda. — Herba Americm BoreaiiSj radice crassa perenni; foliis alternis linear i-Jili f or mihus 

 rigidispinnafijidis, glanduloso-piinctatis punctis peUucidis ; capitulis terminalihns wiicohrihus 

 Jlavis; corollis disci prcecipue glandulis vaide awaris tectis ; involucri suhhemisphcBrici 

 foliolis imhricafis, externis hasi coadunatis. — Nomen Trtn^cg, amarus, et «5)jv, glandula .- ob 

 glandulas ainarissimas. 



1. P. Richardsoni. (Tab. CVIII.) 



Radix subfusiformis, liguosa, descendens, ramosa, supenie divisa. CauJes subspithamaei, erccti, rigidi, 

 glabri, striati, superne ramosi. Folia 3-4 uucias longa, lineari-filiformia, caulina pauca ; omnia pinnatifida, 

 laciniis paucis, remotis, rarius iterum divisis, glanduloso-atque pellucido-punctatis, obscure unicostatis. 

 Pedunculi terrainales, uniflori. Flos majusculus. Tnvohicntin hemisphsericum, impresso-punctatum, glan- 

 dulosum, subpubescens ; /tf //o/i5 oblongis imbricatis, exterioribus inferne coadunatis. Rachis (jiQVi recepta- 

 culmn) conica, carnosa, punctata, ebractcata. Flosculi radii ligulati, obovato-oblongi, Intei, tubo praecipue 

 g-landulosi, apice dentibus 3 grossis ; disci tubulosi, 5-dentati, flavi, glaudulis valde amaris tecti. Antherce 

 subexsevtae. Stifpnata inclusa, breviuscula, apice incrassata et hirsuta. Achenium oblongum, superne 

 latius, pilosum pnecipue apicem versus. Pappus palcaceus, paleis 6-7, erectis, ovatis, acuminatissimis, 

 membrauaceis. 



Hab, About Carlton House, on the Saskatcba^ran. Dr. Richardson, — Allied to Jlymenoxys of Cassini, 

 in the nature of the pappus: but very different in the involucre and habit. 



Tab. CVIII. P. Richardsoni. Fig. 1, Involucre; Jig, 2, Section of do.; Jig, 3, Floret of the ray; ^fig. 4, 

 Floret of the disk; Jig. 5, Stigmas; Jig. 6, Palesc: — wagnijied, 



39. HELENIUM. Linn. 



Capitulum radiatum, radio $. PalecB pappi ar'istatse, acuminatfB. Achenium multifariam 

 pilosum. Stylus exappendiculatus. Rachis margiije bracteolata. — IlerbiE Americana, 

 foYuslinearibuSi iniegris, puhcruHs, scBpe decurrentibus ; capitulis biteisy terminalibus, solitariis^ 

 iingulis radii apice trilobis ; 'm\o\\xcv\s polyphyUis^ nniserialibus ; racbide co/.rea:a. /.cs.?. 



1. H. autumnak; caule angulato, foliis lanceolatis serratis decurrentibus, disci corollis 

 5-fidis radii 3-5-fidis.— Zi«n. Sp, PL p. 1120. Mich. Am. v, 2. p. 133. Pursh, FL Am, v, 

 2. p. 566, Elliott, Carol. i\ 2, p, 401. HooL in Bot Mag. t. 3904. 



