82 HIPPOCASTANACEiE. (HORSE-CHESTNUT FAMILY.) 
tion : plumule 2-leaved : radicle conical, curved. —Leaflets of the 
5 - 7-foliolate leaves serrate, straight-veined, like a Chestnut-leaf. 
Flowers in a terminal thyrsus or dense panicle, often polygamous, 
the greater portion with imperfect pistils and sterile. Pedicels 
jointed. (The ancient name of some Oak or other mast-bearing 
tree.) 
§1. iEscuLus proper. — Fruit covered with prickles. 
1* Hippocdstanum, L. (Common Horse-chestnut.) 
Corrolla spreading, white spotted with purple and yellow, of 5 petals; 
stamens declined; leaflets 7. —This well-known introduced tree may 
be said to be almost naturalized. 
2. iE. glabra, Willd. (Ohio Buckeye.) Stamens curved, 
much longer than the pale yellow corolla of 4 upright petals ; fruit 
prickly when young; leaflets 5. — River-banks, W. Penn, to Michi¬ 
gan. June. — A small tree, the bark exhaling an unpleasant odor, as 
in the rest of the genus. Flowers small, not showy. 
§ 2. PXvia, Boerh. — Fruit smooth. (Buckeye.) 
3. JE. flava, Ait. (Yellow Buckeye.) Stamens shorter than 
the light yellow corolla of 4 very unequal petals; filaments nearly 
straight, woolly; leaflets 5-7, pubescent beneath. — Woods, Ohio, 
May. Often a large tree : seeds very large. 
P-^- VI A, L., the Buckeye with purple or reddish flowers, proba¬ 
bly grows in S. W. Pennsylvania. 
Order 33. CELASTRACE.E. (Spindle-tree Fam.) 
Shrubs or small trees, with small regular and symmetri¬ 
cal flowers, the sepals and the petals both imbricated in the 
hud, the stamens as many as the petals and alternate with 
them (opposite the sepals), inserted on a disk which often 
fills the bottom of the calyx. Fruit a 3- {rarely 4-5-) 
celled pod, free from the calyx. — Seeds solitary or few, ana- 
tropous, with a large embryo in fleshy albumen: cotyle¬ 
dons broad and leaf-like. — Stipules deciduous or incon¬ 
spicuous. Pedicels jointed. 
Synopsis. 
Tribe 1. S TAPHYLEiE. Seeds bony, with no aril. Ovary many* 
ovuled, free from the cup-shaped disk. — Leaves compound. 
1. Staphylea. Flowers in raceme-like clusters. Pods bladdery. 
Tribe 2. EUONYME^. Seeds with pulpy arils. Ovules 2 in 
