102 
Spring Flora of Oklahoma 
broader and shorter, with few undulations or frequently entire, the 
basal sinus often narrow. Samaras slightly more divergent. 
In rich woods. April-May. Eastern part of state. 
5. Acer Negundo L. Box Elder. A small tree. Leaves oppos¬ 
ite, pinnately 3-5 foliolate. Leaflets ovate, lobed, toothed or entire, 
flowers dioecious, drooping, appearing a little before the leaves. Sam¬ 
aras glabrous, long. 
Along streams. April. Common. 
FAMILY 52. iESCULACEiE. Buckeye Family. 
Trees or shrubs, with opposite-petioled, digitately 3-9- 
foliolate leaves, and conspicuous, polygamous, irregular 
flowers in terminal panicles, the bark of an unpleasant 
odor. Calyx 5-lobed or 5-cleft, the lobes unequal. 
Petals 4-5, unequal, clawed. Stamens 5-8, hypogynous. 
Ovary 3-celled. Ovules 2 in each cell. Capsule leathery, 
globose or slightly 3-lobed, smooth or spiny, 1-3-celled. 
Seeds large, shining, cotyledons very thick. 
I. iESCULUS L. 
Characters of the genus the same as for the family. 
Capsule spiny, at least when young; stamens exserted. 
A tree; leaflets 5-7, pubescent. 1. Ae. glabra. 
A shrub; leaflets 7-9, glabrate. 2. Ae. arguta. 
Capsule glabrous; stamens scarcely exceeding the pet¬ 
als. 3. Ae. octandra. 
1. iEsculus glabra Willd. Ohio Buckeye. A large tree. Leaf¬ 
lets generally 5. Flowers small. Corolla of 4 upright, pale yellow 
petals. Stamens curved, about twice as long as the petals. Fruit 
prickly when young. • 
Along streams. Central and eastern Oklahoma. April-Miay. 
2. AEsculus arguta Buckl. Shrubby or western Buckeye. A 
shrub. Twigs, young petioles, leaves and inflorescence somewhat 
pubescent, becoming glabrate. Leaflets 7-9, unequally serrate. Flow¬ 
ers yellow, the center reddish. Stamens exserted, curved. Fruit 
very spiny when young. 
Dry soil. Arbuckle Mountains. March-April. 
