ROBINSON AND GREENMAN. — MEXICAN PLANTS. 393 



added to the group of large-leaved members of Eupltyllanthus. It 

 differs from P. glaucescens, IIBK., as described by Kunth and Miiller, 

 Arg., in its shorter petioles, smaller leaves, and in tbe very different 

 form of the stipules; from P. adenodiscus, Mull., Arg., in the form 

 of the glands in the sterile flower and in the absence of any conical 

 production of the stamineal column ; from P. laxijlorus, Benth., in its 

 much shorter inflorescences, as well as in its leaves, abrupt, not acute, 

 at the base. From all these species it also differs iu having definitely 

 two and not three stamens. 



Acalypha erubescens. An erect, pubescent annual, 6 inches to 

 one foot in height : stems terete, purple, branched, villous with spread- 

 ing white hairs ; lower branches spreading, elongated : leaves ovate, 

 crenate-serrate, obtuse, rounded at the base, 9-14 lines long; petioles 

 4-7 lines long : sterile spikes small, about 3 lines long on peduncles 

 of nearly equal length ; fertile spikes terminal and axillary, dense, 

 short, cylindric, sessile, becoming reddish, 6 lines long, 4 lines in 

 diameter; the lateral ones somewhat smaller; bracts 1 -flowered, sub- 

 equally 7-toothed, villous-pubesceut : styles 3, undivided ; ovary 

 villous above ; seeds ovoid, smooth, black, with a white caruncle. — 

 Collected on limestone hills near Villar, 14 September, 1893 (no. 

 4538). 



Tragia affinis. Stems slender, elongated, flexuous as though 

 twining, finely striated, densely pubescent: stipules 1| lines long; 

 leaves ovate, acute, crenate-serrate, cordate with a deep rounded sinus, 

 green and appressed-pubescent above, paler and more densely pubes- 

 cent beneath, 2-2 £ inches long, 15-20 lines broad ; petioles |— 1 inch 

 in length: racemes loosely flowered, 2\ inches or less in length: 

 calyx of the fertile flower with segments oblong, rounded at the apex, 

 nearly or quite glabrous : capsule depressed globose, hirsute, 3-4 lines 

 in diameter. — Collected in the barranca of Guadalajara, 17 October, 

 1893 (no. 5474). This plant has the whole habit and many of the 

 technical characters of T. macrocarpa, Willd. It differs, however, in 

 its shorter stipules and in the finer and more crenate serration of its 

 leaves, those of T. macrocarpa being rather deeply and sharply serrate- 

 dentate. 



Agave Potosixa. Roots thickened, fusiform ; rootstock bulb- 

 like, an inch or more in diameter, clothed with a thick layer of the 

 broad, scarious, imbricated, persistent bases of the old leaves : fresh 

 leaves few, 4-6 ; the foliar portion lance-linear, 6 inches long, about 5 

 lines broad, narrowed to a slender, unarmed tip ; the narrow white 

 margins bearing short, soft, spreading truncate or irregularly tipped 



