ANALYTICAL KEY TO THE FAMILIES xvii 



Leaves broadly ovate, cordate at the base, acuminate, 5'-12 long, on long 



petioles. Catalpa in Bignouiacese (p. 792). 



Leaves linear to linear-lanceolate, short-stalked or sessile {sometimes alternate). 



Chilopsis in Bignoniaceae (p, 791). 

 cc Leaves with persistent stipules, entire, 



Pinckneya and Cephalantlius in Rubiaceae (pp. 798, 802). 

 aa Leaves palmately lobed. Aceraceae (p. 624). 



**Leaves compound. 



--Leaves persistent, with stipules. 



Leaves equally pinnate ; leaflets entire. Zygophyllaceae (p. 578). 



Leaves unequally pinnately parted into 3-8 linear-lanceolate segments {sometimes 



entire). Lyonothamnus in Rosacese (p. 350). 



Leaves trifoliate. Helietta and Amyris in Rutaceae (pp. 585, 588). 



-1- -^-Leaves deciduous. 



Leaves unequally pinnate or trifoliate. 



Winter-buds with 1 or 2 pairs of obtuse outer scales, usually puberulous. 

 Leaflets 3-5, incisely serrate ; primary veins extending to the teeth. 



Acer Negundo in Aceraceag (p. 641). 



Leaflets usually many, rarely 3 or 1, crenate-serrate or entire, the veins arching 



and uniting within the margin. Fraxinus in Oleaceae (p. 758). 



Winter-buds with many opposite acute glabrous scales ; leaflets sharply serrate ; 



branches with thick pith. Sambucus in Caprifoliaceae (p. 805). 



Leaves digitate, with 5-7 sharply serrate leaflets ; terminal buds large. 



Hippocastanaceae (p. 643). 

 2. Leaves alternate. 

 *Leaves simple. 

 -i-Leaves persistent. 



a Leaves crowded at the end of simple or sparingly branched stems, parallel-nerved, 

 without stipules. 



Leaves flabellate, stem simple. Thrinaz, Coccothrinax, Sabal, Wash- 



ingtonia, Serenoa in Palmae (pp. 103-111). 

 Leaves linear-lanceolate, stem often branched. Lillaceae (p. 115). 



aa Leaves scattered singly or in fascicles along the branches. 

 h Leaves linear or scale-like, without stipules. 



Leaves linear, flattened, light green beneath ; branchlets remaining green 2-4 



years. Taxaceae (p. 97). 



Leaves scale-like, needle-shaped or flattened ; marked by white bands of stomata. 



Coniferae (p. 1). 

 66 Leaves orbicular to lanceolate, 

 c Leaves palmately lobed. 



Leaves stellate-pubescent, about 1^' in diameter, with stipules. 



Sterculiaceae (p. 676). 

 Leaves glabrous, l-2 in diameter, without stipules. Caricaceae (p. 682), 

 cc Leaves not lobed. 



d Branches spinescent. 



Leaves clustered at the ends of the branches, at least 2'-3' long. 



Bucida in Combretaceae (p. 702). 

 Leaves scattered, not more than i'-l' long, generally obovate, mucronate, 

 glabrous and green or brownish tomentulose beneath, 



Condalia in Rhamnaceas (p, 657). 

 Leaves fascicled on lateral branchlets obtuse or emarginate, pale and gla- 

 brous beneath, Bumelia angustifolia in Sapotaceae (p, 744). 

 dd Branches not spinescent. 

 e Leaves serrate or lobed. 



