ANALYTICAL KEY TO THE FAMILIES xvii 



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



petioles. Catalpa in Bignoniaceae (p. 702). 



Leaves linear to linear-lanceolate, short-stalked or sessile (s<nnftiiin'x alternate). 



Chilopsis in Bignoniaceae (p. 791). 

 cc Leaves with persistent stipules, entire. 



Pinckneya and Cephalanthus in Rubiaceae (pp. 7is, SOL'). 

 aa Leaves palmately lobed. Aceraceae (p. 024). 



**Leaves compound. 



-^-Leaves persistent, with stipules. 



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



Leaves unequally pinnately parted into 3-8 linear-lanceolate segments (tomitiiitt s 

 entire). Lyonothamnus in Rosaceae (p. :i.")O). 



Leaves trifoliate. Helietta and Amyris in Rutaceae (pp. > 



-+--*-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 Neguiido in Aceraceae (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. ">). 



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



branches with thick pith. Sambucus in Caprifoliaceae (p. M>.~>). 



Leaves digitate, with 5-7 sharply serrate leaflets ; terminal buds lar^e. 



Hippocastauaceae (p. C.4:'-). 

 2. Leaves alternate. 

 *Leaves simple. 

 -Leaves persistent. 



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

 without stipules. 



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

 ingtonia. Serenoa in Palmae (pp. lo.'Mll). 



Leaves linear-lanceolate, stem often branched. Liliaceae (p. 1 1~>). 



aa Leaves scattered singly or in fascicles along the branches. 

 6 Leaves linear or scale-like, without stipules. 



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



years. Taxaceae (p. !7). 



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 H' in diameter, with stipules. 



Sterculiaceae (p. r,7r,). 



Leaves glabrous, l-2 in diameter, without stipules. Caricaceae (p. (>_'). 

 cc Leaves not lobed. 



d Branches spinescent. 



Leaves clustered at the ends of the branches, at least 2'-.'}' 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 Rhamnaceae (p. <..Y7). 



Leaves fascicled on lateral branchlets obtuse or emarginatt 1 , pah- and gla- 

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

 dd Branches not spinescent. 

 e Leaves serrate or lobed. 



