362 TRANS. ST. LOUIS ACAD. SCIENCE. 



obovate-cuneate, mostly mucronate and entire; flowers few in each axil^ 

 very short-s-talked ; drupe subglobose, about 4 mm. in diameter, the short 

 stout style disarticulating at about the middle; stigma 3-lobed. — Icones, 

 (1840) pi. 287; Watson, Index, 167; Sargent, Forest Trees of N. A. 40 — 

 Texas to Mexico. 



2. C. SPATHULATA, Gray. — Shrub, glabrous or velvety, the twigs with 

 white flaking epidermis or somewhat pruinous-incrusted ; leaves less than 

 a half-inch long, short-petioled, spatulate-cuneate, acute to emarginate; 

 pedicels 2 mm. long; drupe obliquely obovoid, 4 mm. long; style slen- 

 der, slightly 2-lobed, disarticulating near the top. — PI. Wright (1852), i. 

 32; Watson, Index, 16S. — Southern California, Arizona, and Texas, into 

 Mexico. 



3. C. Mexicana, Schl. — Shrub, somewhat intermediate between the 

 last two; leaves spatulate-obovate, acuminate; drupe ellipsoidal, 6 mm. 

 long, with a thicker stone. — Linnjea (1842), xv. 471. — Southern Arizona 

 {Pritigle), from Mexico. 



* * Spineless; leaves ample, often obliquely opposite; flowers mostly umbelled, on a short 

 peduncle; segments of calyx triple-crested above. 



4. C. FERREA, Griseb. — Small tree, with somewhat velvety ascending 

 twigs, often rough with crowded ienticels ; leaves coriaceous but rather 

 thin, glossy above, mostly inch to inch and a half long, broadly elliptical, 

 emarginate-mucronate, entire or with wavy margins, glabrous except on 

 the petiole and upper surface of midrib; peduncle about 2 mm. long, 

 notched at apex, each branch bearing a few short-stalked flowers, the 

 fruiting pedicels as much as 6 mm. long; drupe globose-ovoid; style 

 short, forked nearly to the middle. — Fl. Brit. W. Ind. (1864), 100; Chap- 

 man, Suppl. 612; Sargent, 39. Scutia ferrea, Brongn.Ann. Sc. Nat. (i), 

 X. 363; Watson, Index, 170. RAamnus feyreus, Vahl. Symb. (1794), iii. 

 41, pi. 58. — Southern Florida and Florida Keys, from the West Indies. — 

 If the person who applied the oldest specific name is to be mentioned, this 

 becomes C.ferrea (Vahl.) Griseb. 



ZIZYPIIUS, Juss. — Spiny shrubs with alternate leaves 3-nerved or 

 with their principal veins confluent toward the margin, and small flowers 

 in umbel-like clusters. — Gen. 380; Gray, Gen, ii. 169; Benfh. <!\: Hook. i. 

 375. — About 65 species, chiefly in the warmer parts of Asia and America, 

 ours destitute of the stipular spines which characterize a part of the 

 genus. 



* Umbels on a short peduncle; calyx fleshy; drupe beakless, with a thin-walled stone. 



I. Z. OBTUSIFOLIA, Gray. — Rigid and spinose, or, when more luxuri- 

 ant, slender-branched, somewhat pubescent to glabrate, the angled twigs 

 pruinose incrusted ; leaves mostly glabrate, quarter-inch to inch long, 

 typically thin and green, spatulate to elliptical or on long shoots ovate- 

 deltoid, acute to emarginate, entire or the broader forms unequally coarse- 

 serrate or lobed ; peduncle and pedicels each about 2 mm. long, mostly 



