740 ACERACEAE 
long, acuminate at the apex, finely serrate, acute or acuminate at the base, finely pubescent 
or glabrate in age: panicles 1-3 dm. long: flowers 2-3 cm. long: calyx oblong-campanu- 
late, 1-1.5 cm. Tong. finely glandular: lobes broadly ovate, obtuse: corolla yellow or 
urplish : petals glandular, those of the upper pair with oval blades which are about as 
fone as the villous claw, those of the lateral pair with oval or suborbicular blades narrowed 
into winged villous claws which exceed them in length several times: stamens exserted : 
filaments more or less villous: capsule unarmed, obovoid, 4-6 cm. in diameter : seeds de- 
pressed, 2-3.5 cm. long. [A. flava Ait.] 
In woods and along streams, Pennsylvania to Iowa, Georgia and Texas. Spring. YELLOw BUCK- 
EYE. SWEET BUCKEYE. LARGE BUCKEYE. 
5. Aesculus argüta Buckl. A shrub 1-3 m. tall, with a smooth bark. Leaf-blades 
1-2 dm. in diameter: leaflets 7-9, the blades narrowly elliptic, 6-12 cm. long, acuminate 
at both ends, finely serrate and incised above the middle, lustrous above, dull beneath, 
villous beneath chiefly on the nerves: panicles 1-2 dm. long, finely villous: flowers 2.5 
em. long: calyx campanulate, 4-5 mm. long, minutely glandular’; lobes low and rounded : 
corolla pale yellow: petals pubescent, villous at the base of the blade where they are 
slightly dilated, those of the upper pair oval or broadly oblong, very thin, those of the 
lateral pair with oblong blades which are narrowed into a thick portion about as long as 
the claw: stamens exserted: anthers yellow: capsule subglobose, 3-4.5 cm. in diameter, 
prickly : seeds 1.5-3 cm. broad. 
On plains or prairies, Missouri to Nebraska and Texas. Spring. SHRUBBY BUCKEYE. 
6. Aesculus glabra Willd. A tree sometimes 25 m. tall, with a maximum trunk 
diameter of about 6 dm. Leaf-blades 1-3 dm. in diameter: leaflets 5 or rarely 7, the 
blades elliptic or elliptic-oblanceolate, 7-18 cm. long, short-acuminate, finely serrate, be- 
coming glabrous, cuneate at the base, nearly sessile or short-stalked : panicles 1-2 dm. 
long, finely pubescent: pedicels about 5 mm. long: flowers 12-18 mm. long: calyx 
campanulate, 6-8 mm. long, finely pubescent; lobes broadly ovate, rounded: corolla 
greenish yellow: petals finely pubescent, crisped, dilated just above the claw, villous near 
the base, those of the upper pair linear-spatulate, those of the lateral pair oval or oblong: 
stamens 7, exserted : anthers orange: capsule obovoid or subglobose, 3-7 cm. in diameter, 
prickly : seeds depressed, 2-4 cm. in diameter. 
In woods, Pennsylvania to Kansas, Alabama and the Indian Territory. Spring. OHIO BUCKEYE. 
STINKING BUCKEYE. 
FAMILY 12. ACERACEAE J. St. Hil. MAPLE FAMILY. 
Shrubs or trees of temperate regions, of great economic value, often pos- 
sessing a saccharine usually watery sap, the bark smooth or exfoliating. 
Leaves opposite : blades simple or compound, commonly 3-lobed : stipules want- 
ing. Inflorescence racemose or cymose, more or less compound, often congested. 
Flowers perfect or polygamous, sometimes monoecious or dioecious, regular. 
. Calyx of 4 or 5, rarely 6-9, imbricated often colored deciduous sepals. Corolla 
wanting, or often of as many petals as the sepals and alternate with them, inserted 
on the margin of a hypogynous sometimes obsolete disk. Androecium of as 
many stamens as there are sepals, often 8. Filaments filiform, distinct or some- 
times almost wanting. Anthers introrse, versatile. Gynoecium of 2 more or 
less united carpels. Ovary free. Styles united. Stigma 2-cleft. Ovules 2. 
Fruit 2 nutlets with wings (samara). Seeds solitary, or rarely 2, with a mem- 
branous testa. Endosperm wanting. Embryo with curved or coiled cotyledons. 
Leaves with simple or rarely digitately compound blades: flowers polygamo-dioecious. 1. ACER. 
Leaves with pinnately compound blades: ‘sees dioecious. vicis 2. RULAC. 
x 
1. ACER L. 
Small or large trees, the trunk clothed with a close or exfoliating bark. Leaves 
opposite: blades simple, lobed or digitately compound, or rarely entire. Flowers poly- 
gamo-dioecious, regular, in axillary or terminal racemes or corymbs. Sepals 4 or 5, rarely 
6-9. Disk wanting or cup-like, mostly lobed. Petals wanting or as many as the sepals, 
imbricated. Stamens 4-9, often 8. Ovary 2-celled, 2-lobed, flattened contrary to the 
septum. Samaras 2 together, with leathery or membranous reticulated wings. Seeds soli- 
tary or rarely 2, flattened, ascending, the testa membranous. - MAPLE. 
