TRKLEASE — N. AM. KHAMNACE^. 363 



villous, like the caljx ; drupe siibglobose, about 8 mm. in diameter. — Gen. 

 (1849) ''• ^7°' P'- '^3' ^Vatson. Index, 170. R/iam}ius(^'i)obfusiJ'olius, WooV.. 

 in Torr. cV Gr. Fl. (1840), i. ()S^. Paliurus Texensis, Scheele, Linnsea 

 (1S4S). \xi. 594. — Texas to Mexico. — The broadest leaves, on long 

 shoots, are sometimes nearly 3 inches wide and mo'itly 3-nerved. The 

 name will be written by some botanists Z. obtusifolia (Hook.) Gray. 



2. Z. LYCioiDES, Gray. — Very rigid and spinose, the striate zig-zag 

 branches mostly velvety and whitened; leaves pale, half-inch long or less, 

 short-petioled, subglabrous. oblong or occasionally ovate, obtuse or 

 emarginate, frequently rounded at base, usually entire; drupes globose 

 or somewhat elongated, about S mm. in diameter. — PI. Lindheimer. (1850) 

 168; Watson, Index, 170. — New Mexico to Mexico. 



Var. canescens, Gray. — More hairy, the mostly tomentose 3-ribbed 

 leaves thicker and broader, elliptical to ovate-deltoid, entire to denticulate 

 or somewhat 3-lobed — Rothrock, Bot. Wheeler (187S), 82. — Arizona to 

 southern California and Lower California. — Intermediate between Z^. /jcA 

 oides and Z. obtusifolia in its leaf characters, and perhaps distinct. 



* * Umbels sessile; segments of calvx thinner and less strongly keeled; drupe beaked, 

 nearly dry, with a thick.walled liard and bony stone. 



3. Z. Parryi, Torrey. — Glabrous throughout, flexuouslj' much- 

 branched and spiny; twigs less sulcate and scarcely incrusted ; leaves 

 fascicled, about half-inch long, green, glossy, at length firm, obovate to 

 elliptical, tapering to slender petioles; pedicels very slender, 4 to 6 mm. 

 long; drupe ovoid, about 14 mm. long, the recurved fruiting pedicels of 

 like length. — Bot. Mex. Bound. (1S59). 4^! Watson, Index, 170; Benth. 

 (!!C Hook. Gen. i. 376. — Southern California. 



MICRORHAMNUS, Gray.— .Spiny shrub with fascicled heath-like 

 leaves, and small solitary flowers. — PI. Wright, i. 33; Benth. cV Hook, 

 i. 376. 



I. M. ERicoiDES, Gray. ^Minutely puberulent or mostly glabrous; 

 leaves 2 to 6 mm. long, acute, with strongly revolute margins, the enclosed 

 grooves densely short-tomentose ; stipules broadly triangular, ciliate; 

 pedicels about 2 mm. long; drupe oblong, 6 to 8 mm. long, the slender 

 style disarticulating from its abruptly pointed summit. —Z.c. (1852), 34; 

 Watson, Index, 168. — New Mexico to Texas and Mexico. ^The only spe- 

 cies of the genus. 



BERCHEMIA, Neck. — Twining shrub with alternate slender-petioled 

 conspicuously pinnately-veined leaves, and minute flowers in rather loose 

 panicles. — Elem. Bot. ii. 122; Gray, Gen. ii. 173; Benth. & Hook. i. 377. 

 — About a dozen species, in the warm parts of both hemispheres. 



I. B. voLUBiLis, DC. — Glabrous throughout; twigs slender, terete ; 

 leaves ample, inch or two long, ovate, acute or narrowly acuminate-cus- 

 pidate, with slightly revolute undulate margins; drupe ellipsoidal, about 



