ir.] KEY TO NATURAL ORDERS. 133 



mens definite, more or less coherent below. Ovary undi- 

 vided ; ovules one or two in each cell. 



Malpighiace^ (p. 179). — Climbing shrubs with opposite 

 entire leaves. Calyx often with sessile glands. Petals 

 usually clawed. Stamens ten. Ovary three-lobed. Carpels 

 winged. 



Zygophyllace.^ (p. 180). — Herbs or low shrubs with 

 opposite stipulate compound leaves. Peduncles axillary, 

 one-flowered. Stamens eight or ten, free, often with a 

 minute scale at the base of the filament. 



Geraniace^ (p. 181). — Herbs with opposite or alternate 

 simple or compound leaves. Flowers regular or irregular 

 (the posterior sepal spurred in Tribe BalsariiiuccB), usually 

 two or more on axillary peduncles. Stamens definite. Ovary 

 lobed. 



RuTACEiE (p. 182). — Usually trees or shrubs with alter- 

 nate or opposite compound (pinnate, or tri- or uni-foliolate) 

 leaves, dotted with translucent glands. Stamens as many or 

 twice as many as petals (in Citrus and Aegk indefinite). 



OcHNACETE (p. 184). — Shrubs or trees with alternate, 

 shining, coriaceous, simple, eglandular leaves. Anthers 

 linear, often elongate. Ovary lobed deeply. Fruit of 

 three to five, or more, distinct drupes. 



BuRSERACE^ (p. 185). — Trees with resinous juice, alter- 

 nate compound leaves, and small, panicled or racemose 

 flowers. Stamens free, as many or twice as many as petals. 

 Ovary entire, with two or more cells. 



Meliace^e (p. 186). — Trees or shrubs with alternate com- 

 pound leaves, and panicled flowers. Stamens definite, 

 monadelphous (except in Cedrela and Chloroxylon). Ovary 

 entire. 



Olacace^ (p. 188). — Shrubs or trees usually with alter- 

 nate entire leaves, and axillary fascicles spikes or racemes 



