ANALYTICAL KEY TO THE GENERA XV11 



Leaves abruptly contracted at base, long-pointed, with pale bands of stomata 

 on the lower surface on each side of the mid veins; fruit drupelike. 



Torreya (p. 91). 



Leaves gradually narrowed at base, short-pointed, paler, and without distinct 



bands of stomata on the lower surface; fruit berry-like. Taxus (p. 93). 



666 Leaves ovate-lanceolate and scale-like, spreading in 2 ranks or linear on the same 



tree, acute, compressed, keeled on the back and closely appressed or spreading 



at apex. Sequoia (p. 61). 



aaa Leaves opposite or whorled, usually scale-like. 



Internodes distinctly longer than broad; branchlets flattened, of nearly equal color 

 on both sides; leaves eglandular. Libocedrus (p. 65). 



Internodes about as long as broad, often pale below, usually glandular. 

 Branchlets flattened. 



Branchlets in one plane, much flattened, T \'-J' broad. Thuya (p. 67). 



Branchlets slightly flattened, ^'-jV broad. Chamaecyparis (p. 75). 



Branchlets terete or 4-angled. 



Branchlets more or less in one plane; fruit a cone. Cupressus (p. 69). 



Branchlets not in one plane ; fruit a berry (leaves needle-shaped, in whorls of 3 in 



No. 1). . Juniperus (p. 78). 



2. LEAVES DECIDUOUS. 



Leaves in many-leafed clusters on short lateral spurs. Larix (p. 31). 



Leaves spreading in 2 ranks. Taxodium (p. 63). 



III. Leaves netted-veined, rarely scale-like or wanting. Dicotyledons. 

 A. LEAVES OPPOSITE. (B, see p. xxi). 

 1. LEAVES SIMPLE. (2, see p. xx). 



* Leaves persistent. 

 a Leaves with stipules. 



b Leaves entire or occasionally slightly crenate or serrate. 



c Leaves emarginate at apex, very short-stalked, l'-2' long. 



Leaves obovate, gradually narrowed into the petiole. Gyminda (p. 678). 

 Leaves oval to oblong, rounded or broad-cuneate (rarely alternate). 



Branchlets densely velutinous. Krugiodendron (p. 721). 



Branchlets slightly puberulous at first, soon glabrous. 



Reynosia (p. 720). 

 cc Leaves not emarginate at apex. 



Leaves obtuse, rarely acutish or abruptly short-pointed. 



Leaves elliptic, 3|'-5' long. Rhizophora (p. 763). 



Leaves obovate, usually rounded at apex, |'-2' long. 



Byrsonima (p. 632). 

 Leaves acute to acuminate. 



Leaves oblong-ovate to lanceolate; branchlets glabrous. 



Exostema (p. 877). 

 Leaves broad-elliptic to oblong-elliptic; branchlets villose. 



Guettarda (p. 879). 



66 Leaves serrate (often pinnate). Lyonothamnus (p. 378). 



an Leaves without stipules. 



Petioles biglandular; leaves obtuse or emarginate, l|'-2^' long. 



Laguncularia (p. 767). 

 Petioles without glands. 



Leaves furnished below with small dark glands, slightly aromatic; petioles short. 

 Leaves oblong to oblong-ovate and acuminate or elliptic and bluntly short- 

 pointed. Calyptranthes (p. 769). 

 Leaves ovate, obovate or elliptic. Eugenia (p. 770). 

 Leaves without glands. 



