OF ARTS AND SCIENCES. 61 



tacle alveolate, the alveoli fimbriolate-hirsute : pappus sordid, short- 

 plumose : perennial. 



S. ciCHORiACEA, Gray, Proc. Am. Acad. 1. c. 

 § 2. Stephanomeria proper. Heads 3-20-flowered : receptacle quite 

 naked : pappus-bristles slender, or paleaceous-dilated only at base. 



* Heads fully half an inch high, 10-20-flowered, somewhat corymbosely 



disposed, 



-1- Terminating leafy stems and branches : pappus sordid, of rather 

 long-plumose bristles : involucre a little imbricated, i. e. having one 

 or two bracts intermediate between the principal ones and those of 

 the calyculus, 10-12-flowered. 

 S. Parryi. Low, widely branched from the base ; leaves run- 



auricles adnate-decurrent (a quarter of an incli), those of the short brandies 

 little or not at all so. Alaman's plant, described by DeCandoUe (with " auricu- 

 lis adnatis" in the generic cliaracter), is manifestly of the same species; and 

 good specimens, evidently only elongated branches, have been received from 

 Schultz (under tlie mss. name of Trlxis Pipitzahuac), collected by Schaffner in 

 the valley of Tolucca, near " Tinancinopo" and near " Venancingo " (tlie same 

 doubtless cited by Hcmslcy, 1. c. 25G, under P. fndicosa, to which Schultz first 

 referred it); the base of leaves little if at all adnate. My conjectural reference 

 of this species to P. fruticosa Llav. & Lex., cannot be sustained, nor can DeCan- 

 dolle's Acourtin formosa be the same. 



P. PLATYPHYLLA, Gray, ri. Fendl. Ill, & PI- Wright. 1. c, is probably, but not 

 certainly, a thinner-leaved and less rigid state of the following. 



P. KiGiDA, Gray, 1. c. Glaberrima, gljiucescens, robusta ; foliis crasso-cori- 

 aceis rigidis oblongis vel inferioribus obovato-oblongis, basi parum angusta sub- 

 cordata sagittato-auriculata, summis parvulis nunc integerrimis ; capitulis 

 nudatim cymosis; involucro oblongo-campanulato 9-11- (-15-) floro. — Aconrtia 

 rigida, DC. Prodr. vii. 66. A. formosa, Hook. & Arn. Bot. Beech. 437, i. e. "Trixis 

 latifolin," Hook. & Arn. 1. c. 300, but cliar. of "spinescent scales of the involu- 

 cre " does not accord : probably some admixture of specimens. Acourtia formosa, 

 DC. 1. c, non Don, is probably the same species. It occurs in various collections. 

 ++ ++ Capitula 5flora, raro 6-flora, numerosa, in glomerulis paniculata: involucri 



cylindracei bractea; obtusissimaj : corollfe pallida : folia coriacea, oblonga, 



basi angusta saepius acuta. 



P. RETICULATA, Gray, 1. c. 128. Proustia retictdnta, Lag. ex Don, I. c. 200; 

 ■ DC. 1. c. 27. A well-marked species, in various Mexican collections ; said to be 

 shrubby, but none of my specimens show it, nor have they the base of the 

 stem. 



P. FRUTICOSA, Llav. & Lex. i. 26, remains wholly doubtful. It is described as 

 an alpine slirub, of the heiglit of a man, with amplexicaul and roundish leaves, 

 cylindrical and many-flowered involucre, and rose colored corollas, tlie outer 

 radiant and the inner small : so tliat it is a very doubtful member of this genus. 



