146 riiOCEEDINGS OF THE AMERICAN ACADEMY 



elongated (4 iuches long or less) : flowers scattered, sunk in pits in the 

 fleshy rhachis : bract very minute and fleshy : stamens two, scarcely 

 exserted : ovary oblique-ovate, the stigma apical and sessile. — On 

 rich shaded banks in the barranca near Guadalajara ; September, 

 1889 (n. 2953). 



Euphorbia (Ctttarospermum) digitata. Near E. dioscore- 

 oides, probably annual and 2 feet Iiigh, erect, with rather numerous 

 very slender ascending branches, ghibrous : raraeal leaves about equal- 

 ling the very slender petioles, ovate-lanceolate, acute, rounded at base, 

 6 to 9 lines long, gradually diminishing upward, basally peltate, entire, 

 ciliate ; peduncles solitary in the axils (rarely in pairs), usually ex- 

 ceeding the leaves, binodose and glandular-brai'teate (bracts very 

 rarely filiform), bearing otdy a single terminal involucre: involu- 

 cres turbinate-campanulate, | line long; appendages of the roundish 

 glands regularly 4— 6-parted into narrowly linear segments, or these 

 sometimes more or less united : capsule long-exserted • seeds | line 

 long, ovate, pitted, the pits with a central cavity and their margins 

 rather obscurely tuberculate. — On limestone hills near Las Pahnas, 

 San Luis Potosi ; October, 1890 (n. 3525). Distinguished from 

 E. dioscoreoides by its habit, less pubescence, solitary glandular-brac- 

 teate peduncles and more divided appendages. The seeds are also 

 smaller, scarcely more than half as large, similarly pitted, but the 

 margins of the pits less distinctly tuberculate. 



Euphorbia (Cyttarospkrmum) subpeltata. Perennial, the 

 stems somewhat woody from a thickened or subtuberous root, erect, 

 glabrous, with numerous ascending or divaricate branches : leaves 

 alternate, on very slender petioles (3 to 8 lines long), semi-orbicu- 

 lar, short-cuneate at base and attached to the petiole slightly within 

 the margin, entire, glabrous, 3 to 8 lines broad : involucVes in short 

 slender axillary racemas, with elongated filiform bracts, carapanulate, 

 J line long ; lobes minute, lacerate; glands very small, subreniforra, 

 the purple or purplish appendages palmately divided into 3 or 4 linear- 

 subulate obtuse lobes as long as the involucral tube: capsule glabrous, 

 the subgloi)ose greenish seeds (| line long) marked with broad shal- 

 low pits and somewhat tuberculate. — On limestone ledges in Tama- 

 sopo Canon, San Lnis Potosi ; August and September, 1890 (n. 3272). 

 Nearly allied to E. dioscoreoides. 



Euphorbia (Tithymalus) misella. Annual, erect, branching 

 alternately below, dichotomously above, low and slender (2 or 3 inches 

 high), slightly pubescent : lower leaves alternate, tht^ upper opposite, 

 petiolate, round-obovate, entire, 1 or 2 lines long : involucres solitary 



