XX11 ANALYTICAL KEY TO THE GENERA 



Leaves elliptic to oblong, rounded at base; juice milky or 



viscid. 



Leaves emarginate; petioles slender, rufous-tomentulose. 



Mimusops (p. 819). 



Leaves obtuse at apex; petioles stout, grayish-tomentu- 

 lose or glabrous. Rhus integrif olia (p. 664) . 



gg Leaves cuneate at base. 



Petioles slender, % long. Beureria (p. 861). 



Petioles short and stout. 



Leaves coriaceous, with thick revolute margins (some- 

 times opposite). Jacquinia (p. 804). 

 Leaves subcoriaceous, slightly revolute. 

 Leaves reticulate-veined beneath. 



Leaves oval to obovate or oblong-oval, more or less 

 pubescent while young. Vaccinium (p. 802) . 



Leaves oblong to oblong-obovate, glabrous. 



Cyrilla (p. 666). 

 Leaves obscurely veined beneath, glabrous. 



Leaves oblong-lanceolate, narrowed toward the 

 emarginate apex, decurrent nearly to base of 

 petiole. Cliftonia (p. 667) . 



Leaves rounded at apex, distinctly petioled. 



Maytenus (p. 676). 

 **Leaves deciduous. 



t Leaves conspicuous, (ft. see p. xxvi.) 



a Leaves entire, sometimes 3 or 4-lobed. (aa, see p. xxv). 

 6 Stipules present. 



Juice milky. Madura (p. 331). 



Juice watery. 



Stipules connate, enveloping the young leaves, their scars encircling the 



branchlet. 

 Leaves acute or acuminate, entire; winter-buds pointed, nearly terete. 



Magnolia (p. 342) . 

 Leaves truncate, sinuately 4-lobed; winter-buds obtuse, compressed. 



Liriodendron (p. 351). 

 Stipules distinct. 



Branches spinescent; leaves glandular, caducous (crenately serrate on vigor- 

 ous shoots). Dalea (p. 621). 

 Branches not spinescent; leaves without glands. 



Winter-buds with a single pair of connate scales. Salix (p. 138). 



Winter-buds with several pairs of imbricate scales. 



Branchlets without a terminal bud; leaves 3-nerved. Celtis (p. 318). 

 Branchlets with a terminal bud, leaves penniveined. 



Quercus sp. 17-20 (p. 262). 

 bb Stipules wanting. 



c Branchlets bright green and lustrous for the first 2 or 3 years; leaves some- 

 times 3-lobed, aromatic. Sassafras (p. 362). 

 cc Branchlets brown or gray. 



d Leaves acute or acuminate. 



Leaves 10'-12' long, obovate-oblong, acuminate, glabrous, emitting a 

 disagreeable odor. Asimina (p. 353) . 



Leaves smaller. 



Petioles very slender, l'-2' long; leaves elliptic, acuminate. 



Cornus alternifolia (p. 789). 

 Petioles short. 



Branchlets with a terminal bud. 



Leaf-scars about as long as broad; branchlets without lenticels, 

 light reddish brown. Elliottia (p. 791). 



Leaf-scars crescent-shaped, broader than long, with 3 distinct 

 bundle-traces. 



