OP ARTS AND SCIENCES. 161 



Irestne Pringlei. Shrubby, finely tomentose, dioecious : very 

 young leaves densely white-tomentose, becoming bright green and 

 nearly glabrous above and thinly tomentose beneath, lanceolate, acute 

 or acutish, subcuneate at base, short-petiolate, 2 or 3 inches long : 

 inflorescence a broad open naked panicle, tlie small sessile clusters 

 thickly scattered along the branches, often contiguous : bracts of 

 staminate flowers very minute, the hyaline sepals linear-oblong ; 

 bracts of pistillate flowers broadly ovate, very thin, shorter than the 

 calyx ; sepals rigid, very woolly especially near the base, about ^ line 

 long, lanceolate, acuminate and the tips somewhat spreading, with a 

 broad bright green midnerve and white margins. — On shaded ledges 

 of the barranca near Guadalajara; November, 1888 (n. 1785). A 

 species well marked by the peculiar calyx of the fertile flowers. 



Euphorbia (Cham^stce^) longeramosa. Of the Leiospermce 

 group, annual, glabrous, the divaricate branches often 2 or 3 feet 

 long : stipules lanceolate, laciniately cleft ; leaves linear, obtuse at 

 both ends or cuneate at base, very shortly petiolate, 6 to 15 lines 

 long : involucres solitary in the axils or somewhat cymose, on mostly 

 very short peduncles, broadly campanulate, a line long ; lobes erect, 

 triangular, acute or apiculate, entire ; glands transversely oblong, with 

 an erect yellowish broad reniform appendage : capsule small, acutely 

 lobed, smooth : seed subcompressed-triangular. — On sand hills near 

 Samalayuca, Chihuahua ; September, 1889 (n. 2000). 



Euphorbia (Ztgophyllidium) hexagonoides. Annual, slender, 

 erect and branching, glabrous throughout or the involucres and floral 

 leaves slightly pubescent: leaves all opposite, very narrowly linear, 

 attenuate at each end and long-petiolate, J to 1 J inches long : involu- 

 cres very small, the lobes scarious, quadrate, lacerate-dentate ; glands 

 purplish, incurved, with a horizontal deltoid appendage (sometimes 

 very small or none): capsule with broad rounded lobes: seed a line 

 long, ecarunculate, subtetragonal, acute, strongly and irregularly 

 tuberculate. — On dry banks in the foothills of the Sierra Madre, 

 Nuevo Leon; October, 1889 (n. 2016). Near E.hexagona. 



Euphorbia (Esul^) longecornuta. Perennial, woody below, 

 much branched, 6 inches high or more, glabrous and glaucous : leaves 

 numerous, oblong to broadly elliptical, acute or acutish and mucronate, 

 about 3 lines long: rays 3 to 5, short (J inch), simple or once 

 branched, the bracts like the cauline leaves or broader: involucres 

 small (less than a line long), about equalling the peduncle; glands 

 usually with long-attenuate horns nearly as long as the involuc-e ; 

 lobes oblong, densely ciliate : seeds coarsely and irregularly few- 



VOL. XXV. (n. 8. XVII.) 11 



