270 



MEMOIRS OF THE XEW YORK BOTAXICAL GARDEN 



Canamiiia, 4,000 feet, 0. E. White, July 20, 1921 {no. 285). 

 "Flowers violet; common along irrigating ditches." 



Erythroxylaceae 

 Erythroxylon opacum 



(Only fruiting specimens seen.) Glal)rons, the hranchlets 

 slender, terete, gray, leafy. Stipules 4 mm. long, ovate, acute, 

 thick and rigid, bearing a dorsal awn near the suimnit, persist- 

 ent. Petioles stout, shorter than the stipules. Blades 6 to 10 cm. 

 long, 2 to 4 cm. broad, oval, acute at both ends, the summit pro- 

 duced into a short and broad point, the margin thinly revolute; 

 tliickish, dull-green, darker above, where the venation is lightly 

 prominent, the principal secondaries 10 or 12 on a side, with 

 shorter ones alternating, interarching at some distance from the 

 margin, the venation loosely anastomosing. Fruiting pedicels 

 about as long as the fruits, subtended by several minute bracts, 

 slender, regularly thickened upward, where they are sharply 

 angled. Calyx persistent, rotate, 3 nmi. broad, usually bearing 

 some of the persistent filaments. Sepals ovate, thick, obtusish. 

 Fruit 8 mm. long and half as broad, ellipsoidal, sometimes bear- 

 ing the persistent styles, which are about as long as the sepals. 



Eurrenabaque, 1,000 feet, 0. E. White, January ."), 1922 (»o. 

 2327). ' ' Fruit reddish-green when collected. ' ' 



Erythroxylon venosum 



Glabrous, much branched, the branchlets slender. Stipules 2 

 to 3 mm. long, subulate, acuminate and acute, thick, erect. Peti- 

 oles 3 or 4 mm. long, stout, dark-red-brown, the blades 3 to 6 cm. 

 long, 1.5 to 3 cm. ^^dde, oval Avith acute or acutish base and blunt 

 or obtusish summit, the margin thinly revolute, thick, slightly 

 shining above, the midrib and secondaries slightly prominent l)e- 

 neath, the venation elevated and conspicuously reticulate above, 

 the secondaries 6 or 8 on a side, strongly ascending, crooked, con- 

 necting about two thirds of the way from the midrib to the 

 margin. Lateral lines about a third of the way from the midrib 

 to the margin, obscure, Avanting in most leaves, very slender, 

 crooked, enclosing an areola Avhich is often of a browner color 

 than the rest of the surface. Flowers few, mostly solitary or 2 

 together, minutely bracted at the base, spreading or somewhat 

 recurved. Pedicels about 3 mm. long, thickened and sharply 

 angled above. Calyx 2 to 3 mm. Avide, the sepals triangulate. 



