10 PROCEEDINGS OP THE AMERICAN ACADEMY 



the receptacle, and more or less of long villosity at least on the 

 margins of the akenes; viz. H. quinquenervis (the large-flowered 

 Helianthella unijlora, so called, of the Colorado Rocky Mountains, 

 extending to the British boundary, but not of Nuttall in coll. Wyetli, 

 nor of his character in Trans. Am. Phil. Soc, though he mixed the 

 two in his own collection : it is the Helianthus quinquenervis, Hook. 

 Lond. Jour. Bot. vi. 247, of Geyer's collection) ; H. Parryi ; H. Mex- 

 icana ; H. microcephala, the Encelia microcephala, Gray, Proc. Am. 

 Acad. viii. 657. The following have chaff of a firmer or chartaceous 

 texture : H. lancelata, with hirsute or hispidulous loose pubescence 

 and no long villosity to the ovary or akene ; H. Douglasii, still known 

 only by the specimen in the Hookerian herbarium, perhaps a form of 

 the preceding ; H. unijlora, with fine and close pubescence, and more 

 or less villous akenes, at least on the margins (J7. multicaulis, Eaton, 

 is a form of this, his H. unijiora being our //. quinquenervis) ; and H. 

 Californica, with nearly all the leaves petioled, and the ovary and 

 akene quite glabrous. 



OtedjEA Seemanni. Viguiera Seemanni, Schultz Bip. in Bot. 

 Herald, 305 ; Hemsl. Biol. Centr.-Am. Bot. ii. 178. Good fruit is 

 still needed ; but the ovary is glabrous on the sides and with acute 

 edges, and the habit is wholly of Oyedcea, to which the plant jDrobably 

 belongs. 



Zexmenia niSPiDA. Z. Texana, Gray, PI. "Wright, i. 112, Bot. 

 Mex. Bound. 92. In the first-mentioned publication the resemblance 

 of our Texan plant to Wedelia hispida, HBK., is noted ; in the sec- 

 ond, the identity is affirmed. This is now beyond question, where- 

 fore it is best to reinstate the original specific name. Bentham and 

 Hooker, in Gen. PI., still leave Kunth's plant, and therefore Cassini's 

 Stemmodontia, in Wedelia, while yet recognizing the Texan plant as a 

 Zexmenia. The former reference is probably from the published 

 figure, which wants the fruit ; the latter, fiom numerous specimens. 

 The name of the section should be Stemmodontia. 



Zexmenia brevifolia, Gray, PI. Wright, i. 112. Nearer than the 

 preceding species to true Zexmenia. Although the akenes are, as Ben- 

 tham states, " sajpe vix alata," yet they are often surmounted by a 

 strong callous wing. Squamella? of the pappus sometimes very con- 

 spicuous, sometimes obsolete in age. 



Zexmenia aurea, Wcddia aurea, Don in Bot. Mag. t. 3384 ( Ver- 

 hesina, DC), referred here by Bentham (although there are no squa- 

 mellne), has been distributed from a collection of Schalfner's (no. 56) 

 as Z. tubt-rosa. The roots swell and become tuber-like. 



