164 PROCEEDINGS OF THE AMERICAN ACADEMY 



press it is stated that the bract is not represented in the figure, but it 

 is. Bentham describes the embryo as straight, on the authority of a 

 sketch by Dr. Torrey ; who, however, from later specimens collected 

 by Dr. Bigelow, has upon his plate well represented the embryo (as 

 strongly excentric), but makes no reference to it in the letter-press. — 

 This and the preceding species are brought together from their resem- 

 blance in structure and in the very woolly ovary, rather than in habit. 



§ 6. Heterosepala. (Gen. Eucycla, Nutt.) Flos basi ipsa haud 

 producta cum pedicello articulatus : perigonium glaberrimum, 6- 

 partitum, omnino petaloideum, post anthesin tenuiter scarioso- 

 marcescens ; segmentis tunc biseriatis maxime disparibus, exteri- 

 oribus rotundatis magis demum auctis basi cordulatis, auriculis 

 usque ad vel ultra articulum extensis ; interioribus angustis spa- 

 thulatis emarginatis mox paullo longioribus conniventi-erectis invo- 

 lutisque, singulis basi unguiformi stamina 3 gerentibus. Involu- 

 cra (5 — 8-dentata) capitata vel umbellato-eymosa in scapo pror- 

 sus aphyllo simplici. Ovarium glabrum. Embryo incurvus, 

 radicula adscendente cotyledonibus orbicularis accumbentibus 

 longe superante. — Herbre perennes, caespitoso-acaulescentes, cano- 

 lanatae, foliis ovalibus vel subrotundis petiolatis in ramis brevissimis 

 caudicis multicipitis confertis, bracteis minimis seu evanidis. 



25. E. proliferum, n. sp. Scapo (spithamreo ad pedalem) umbel- 

 lam prolifero-compositam gerentibus, radiis primariis 2 — 6, sequentibus 

 binis nunc solitariis, cum involucro alari semper sessili ; perigonii rosei 

 segmentis exterioribus orbiculari-obovatis ovalibusque post anthesin 

 vix aut leviter cordulatis. — Idaho Mountains (Prof. 0. Marcy, Prof. 

 Swallow) to N. Fork of the Columbia, Wilkes's Expedition (the 

 plant had been doubtfully referred to E. oblong if olium), Weenass 

 Valley and Walla- Walla, Lyall. Foliage nearly as in the next ; but the 

 inflorescence cymose-umbellate, usually lax; a central sessile involucre 

 in the primary umbel and in the successive forks, not rarely secund 

 by the suppression of one of the pair of secondary and tertiary rays. 

 Involucres and perigonia after flowering hardly exceeding a line and 

 a half in length. Filaments, as in the next, villous-pubescent below. 



26. E. ovalifolium, Nutt. in Jour. Acad. Philad. 7, p. 50, t. 8. 

 Scapo (3 -9-pollicari) capitulo simplici (rarissime prolifero dicephalo) 

 ex involucris paucis (3-8) arete sessilibus terminato ; perigonio aut 

 flavo aut roseo-purpureo, fructifero albido, segmentis exterioribus latis- 



