XVlll ANALYTICAL KEY TO THE FAMILIES 



yjuice watery. 



g IStipules present. 



/i Primary veins extending' straight to the teeth. 



Pasaiiia and some species of Quercus in Fagaceae (pp. 224, 



220). 

 hh Primary veins arching and united within the margin. 

 Leaves 3-nerved from the base. 



Ceanothus in Rhamnaceae (p. 065). 

 Leaves not o-nerved. 

 Leaves acute. 

 Leaves sinuately dentate, with few spiny teeth, glabrous. 



Ilex opaca in Aquifoliaceae (p. 014). 

 Leaves serrate. 



Vauquelinia, Heteromeles, and Prunus Carolin- 

 iaua and Prunus ilicif olia in Rosaceae (pp. o40, 



358, 527, 530). 

 Leaves obtuse, sometimes mucronate. 

 Leaves spinose-serrate, g-labrous. 



Rhamnus crocea in Rhamnaceae (p. 602). 

 Leaves crenate {often entire), oval to oblong. 



Hex vomitoria in Aquifoliaceae (p. 010). 

 hhh Primary veins extending straight to the teeth. 



Cercocarpus in Rosaceae (p. 504). 

 gg Stipules wanting-. 



Leaves resinous-dotted, aromatic. Myricaceae (p, 140). 



Leaves not resinous-dotted, crenately serrate, gradually narrowed 

 into short stout petioles ; bark red-brown. 



Gordonia Lasianthus in Theaceae (p. 078). 

 _// Juice milky. 



Hippomane and Gymnanthes in Euphorbiaceae (pp. 598, 599). 

 e Leaves entire {rarely sparingly toothed on vigorous hranchlets). 

 i Stipules present. 

 j Stipules connate, at least at first. 



Stipules persistent, forming a sheath surrounding the branch above 

 the node; leaves obtuse. Polygonaceae (p. 311). 



Stipules deciduous, enveloping the young leaf before unfolding. 

 Leaves ferrugineous-tomentose beneath. 



Magnolia fcetida in Magnoliaceae (p. 310). 

 Leaves glabrous beneath, with milky juice. 



Ficus in Moraceae (p. 308). 

 jj Stipules free. 

 k Juice milky. 



Drypetes and Gymnanthes in Euphorbiaceae 



(pp. 595, 599). 

 kk Juice watery. 



/ Leaves obtuse or emarginate at the apex. 



Leaves with ferrugineous scales beneath, their petioles slender. 



' Capparidaceae (p. 338). 



Leaves without ferrugineous scales. 



Leaves rarely 2'-3' long, standing on the branch at acute 



angles. Chrysobalanus in Rosaceae (p. 532). 



' Leaves rarely more than 1 ' long, spreading (sometimes 3-nerved). 



Ceanothus spinosus in Rhamnaceae (pp. 067). 



