XV111 ANALYTICAL KEY TO THE GENERA 



Leaves green and glabrous below. 



Leaves obtuse or emarginate at apex (rarely alternate), I'-l^' long. 



Tomibia (p. 341). 



Leaves acute, acuminate, or sometimes rounded or emarginate, 3'-5' long. 

 Leaves distinctly veined. Citharexylon (p. 864). 



Leaves obscurely veined. Osmanthus (p. 856). 



Leaves hoary tomentulose or scurfy below. 



Leaves strongly 3-nerved, acuminate, densely scurfy oelow. 



Tetrazygia (p. 776). 

 Leaves penniveined, rounded or acute at apex, hoary tomentulose below. 



Avicennia (p. 865). 



** Leaves deciduous. 

 a Leaves without lobes. 

 6 Leaves serrate. 



Winter-buds with several opposite outer scales. 



Leaves puberulous below, closely and finely serrate; axillary buds solitary. 



Evonymus (p. 675). 



Leaves glabrous below, remotely crenate-serrulate ; axillary buds several, 

 superposed. Forestiera (p. 853). 



Winter-buds enclosed in 2 large opposite scales. Viburnum (p. 886). 



bb Leaves entire. 



c Leaves without stipules. 



Leaves suborbicular or elliptic to oblong. 



Leaves rounded or acutish at apex, l'-2' long, occasionally 3-foliolate, 

 glabrous; branchlets quadrangular. Fraxinus anomala (p. 837). 



Leaves acuminate or acute at apex, 3'-4' long. 



Leaf-scars connected by a transverse line, with 3 bundle-traces; branch- 

 lets slender, appressed-pubescent. Cornus (p. 785). 

 Leaf-scars not connected, with 1 bundle-trace; branchlets stout, villose, 

 puberulous or glabrous. Chionanthus (p. 855). 

 Leaves broad-ovate, cordate, acuminate, 5' 12' long, on long petioles. 



Catalpa (p. 870). 



Leaves linear to linear-lanceolate, short-stalked or sessile (sometimes alter- 

 nate). Chilopsis (p. 869). 

 cc Leaves with persistent stipules, entire. 



Leaves oval or ovate; winter-buds resinous, the terminal up to \' in length. 



Pinckneya (p. 876). 



Leaves ovate to lanceolate; winter-buds minute. Cephalanthus (p. 878). 

 aa Leaves palmately lobed. Acer (p. 681). 



2. LEAVES COMPOUND. 



a Leaves persistent, with stipules. 



Leaves equally pinnate; leaflets entire. Guaiacum (p. 630). 



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

 entire). Lyonothamnus (p. 378). 



Leaves trifoliate. 



Leaflets stalked. Amyris (p. 640). 



Leaflets sessile. Helietta (p. 637). 



aa Leaves deciduous. 



Leaves unequally pinnate or trifoliate. 



Leaflets crenate-serrate or entire, the veins arching within the margins; stipules 

 wanting; winter-buds with several opposite scales. Fraxinus (p. 833). 



Leaflets sharply or incisely serrate, the primary veins extending to the teeth. 

 Leaflets 3-7, incisely serrate; stipules present; winter-buds with 1 pair of obtuse 

 outer scales. Acer Negundo (p. 699). 



Leaflets 5-9, sharply serrate; stipules present; winter-buds with many opposite 

 acute scales; pith thick. Sambucus (p. 882). 



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



^sculus (p. 702). 



