ANALYTICAL KEY TO THE GENERA XXI 



Leaves mostly rounded at the narrowed base, ovate to ob- 

 long, acute, glabrous. Anona (p. 354). 

 Leaves more or less cuneate at base, elliptic to lanceolate, 



usually acuminate. 



Leaves abruptly long-acuminate, glabrous, the margin un- 

 dulate; branchlets red-brown. Misanteca (p. 364). 

 Leaves gradually acuminate or nearly acute. 

 Leaves strongly reticulate beneath. 



Branchlets glabrous, light grayish brown; leaves gla- 

 brous, light green beneath. Ocotea (p. 359). 

 Branchlets pubescent while young, greenish or yellow- 

 ish; leaves pale beneath, pubescent while young. 



Umbellularia (p. 360). 



Leaves not or slightly reticulate, glaucous, glabrous or 

 pubescent beneath. Persea (p. 356). 



ee Leaves not aromatic. 



/ Leaves acute or acutish. 



Leaves obovate, gradually narrowed into short petioles. 



Leaves 2'-2i' long. Schaefferia (p. 679). 



Leaves at least 6'-8' long. Enallagma (p. 873). 



Leaves elliptic to oblong or ovate. 



Leaves rough or pubescent above, pubescent below, subcor- 



date to cuneate at base. 



Leaves stellate-pubescent. Solanum (p. 867). 



Leaves scabrous above. 



Petiole j '-\' long; leaves oval or oblong, lj'-4' long. 



Ehretia (p. 862). 



Petiole I'-l^' long; leaves ovate to oblong-ovate, 3'-7' 

 long. Cordia (p. 858). 



Leaves smooth above. 

 Winter-buds scaly. 



Leaves covered below with ferrugineous or pale scales, 

 l'-3' long. Lyonia (p. 797). 



Leaves glabrous or nearly so below. 



Leaves ovate-lanceolate or obovate-lanceolate, 4' 12' 

 long, usually clustered at end of branchlet, veinlets 

 below obscure. Rhododendron (p. 792). 



Leaves elliptic or oval to oblong or lanceolate. 



Leaves light yellowish green below and without dis- 

 tinctly visible veins or veinlets, entire, 3'-4' long. 



Kalmia (p. 794). 



Leaves pale below and more or less distinctly reticu- 

 late, occasionally serrate or denticulate, l'-5' 

 long; bark of branches red. Arbutus (p. 799). 

 Winter-buds naked. 



Leaves pubescent below when unfolding. 

 Mature leaves nearly glabrous below. 



Leaves oblong-lanceolate to narrow-obovate. 



Dipholis (p. 810). 



Leaves oval. Sideroxylum (p. 809). 



Mature leaves covered below with brilliant copper- 

 colored pubescence. 



Leaves glabrous below. Chrysophyllum (p. 817). 



Leaves marked by minute black dots, ovate to 



oblong-lanceolate. Ardisia (p. 806). 



Leaves lepidote, oblong-obovate. Rapanea (p. 807). 



ff Leaves obtuse or emarginate at apex. 



g Leaves rounded or cordate at base, emarginate, their petioles 



slender. 

 Leaves reniform to broad-ovate, cordate; juice watery. 



Cercis (p. 603). 



