OF ARTS AND SCIENCES. 103 



A. uNCiALis, E. L. Greene in Bot. Gazette, v. 64 (1880). A. hrachy- 

 stephance quoad flores affinis, facie A. involucratas, sed humillima ; 

 ciicuUis autheris paullo brevioribus, dorso lato-rotundato lobos auricu- 

 laeformes anticas aequante, cornu seu processu ovato-oblongo obtusis- 

 simo incluso. — New Mexico near Silver City, Greene. Plains of 

 Colorado, Hall & Harbour (478). Green River, N. W. Wyoming, 

 Parry (246). The last two have been referred to A. hrachystephana 

 in Proc. Acad. Philad. 1863, Am. Nat. 1874, and in Syn. Fl. ii. 94. 

 The stems above ground are only an inch or two high, so that the 

 name is not inappropriate, even if they should attain a somewhat 

 greater height. As in the related A. hrachystephana, the hoods are 

 not higher than broad, and are of similar structure, but the back is 

 rounder and the triangular anterior lobes or auricles not projecting, 

 while a short fleshy process takes the place of the subulate horn. 

 The hoods are not longer than those of A. hrachystephana, but the 

 gynostemium, or mass above the insertion of the hoods, is shorter. 



AscLEPiAS QuiNQUEDENTATA, var. Neo-Mexicana, E. L. Greene 

 in litt. Floribus subdimidio minoribus. — Rocky mountain-side east 

 of Pinos Altos, in the southern part of New Mexico, June 22, 1880, 

 E. L. Greene. The discoverer had distinguished and characterized 

 this as a new species, and justly, if the published character of A. 

 quinquedentata were quite correct. But in that a mistake was made 

 by assigning " a small acute dorsal tooth " to the horn of the hood. 

 That tooth is, in fact, only the middle one of the five teeth of the 

 hood itself, to which the horn is sometimes adnate up to the very tip, 

 sometimes not so far. Wright's original certainly has flowers of nearly 

 twice the size of those of Mr. Greene's specimens. But the plant 

 growing around San Luis Potosi (Parry and Palmer's 583, and also 

 sent by Dr. Schaffner) is just intermediate. In this species, as in 

 A. Linaria, Cav., the follicle is arrect on a deflexed pedicel. 



The characters of three species of adjacent Mexico are appended. 



AscLEPiAS ScHAFFNERi. Spccies concinna, A. Coulteri affinis, 

 glabella ; caule gracili simplici subpedali ; foliis oppositis fiiliformi- 

 linearibus ; umbellis pedunculatis laxe paucifloris ; floribus rubellis 

 nunc viridulis ; corolliE lobis (lin. 3 longis) ovato-oblongis ; cucullis 

 (cum columna brevi parum breviori) antheras sublonge superan- 

 tibus complicato-compressis inferne dorso carnosis solid is superne 

 petaloideis antice utrinque longe acuminato-productis, dorso quasi 

 exciso medio callo obtuso apiculato, processu interno adnato subulato 

 gracili rectiusculo longe exserto : folliculo fusiformi puberulo arrecto. — 

 Near San Luis Potosi, Mexico, Schaffner, Parry & Palmer (582). 



