Aesculus glabra Willd.
Family - Hippocastanaceae
Habit - Shrub or tree to 20 m tall.
Stems - Woody, to 20 m, with a single trunk or multiple trunks. Bark variable.
Trunk of mature tree.
Leaves - Opposite, palmately compound, petiolate. Leaflets typically 5, but sometimes 6 or 7, 3-8cm wide, 15cm long, serrate, pubescent below, glabrous above, acuminate. Petiolules to 1cm long.
Inflorescence - Terminal panicle to 20cm long on new season growth. Axis of inflorescence densely pubescent with multicellular hairs. Pedicels pubescent, to 8mm long in flower.
Flowers - Petals 4, pale yellow to creamy whitish, clawed. Claws of upper petals to 3.5mm long, with dense tuft of villous pubescence at apex. Limb of upper petals +1.5cm long, 4mm broad at apex, with reddish spot near base of limb, pubescent. Lower petals with claw to 3.5mm long. Limb of lower petals +1cm long, 8-9mm broad, pubescent. Stamens 7, exserted. Filaments villous, to -2cm long, white. Anthers orange-red, 2mm long. Ovary 6mm long, dense villous at base but glabrous and reddish at apex. Calyx tube to 7mm long, 5mm in diameter, 5-lobed, yellow-green, pubescent. Lobes to 3mm long, obtuse, pubescent. Fruits globose, spiny, 2.5-6cm in diameter. Seeds 2 per fruit, +/-3cm in diameter, shiny, dark brown.
Fruits - Capsules, 2-4 cm long, ovoid, leathery, dehiscent longitudinally, 1-3-seeded. Seeds 2-4 cm long, variously depressed-globose, smooth, shiny, reddish brown with a large, pale, attachment scar.
Flowering - April - May.
Habitat - Wooded slopes, ravines, thickets, open, rich woods, also cultivated.
Origin - Native to U.S.
Other info. - This species can be found throughout most of Missouri except
the extreme southeastern and northwestern corners of the state. The tree is easy to identify
because of its palmately divided leaves (which are opposite) and its big inflorescences. The
buds are easy to ID in winter also as they are quite large and the tree generally has a widely
spreading growth habit. This species deserves to be cultivated more and it grows easily from seed. The fruits of the
plant split into three parts, with large, attractive shiny seeds (buckeyes) inside. Some sources claim that the seeds can be eaten if
roasted first, but the raw seeds are mildly poisonous. Native Americans have used crushed buckeyes to tranquilize fish
to make them easier to catch. The large seeds have been carried in the pocket for their pleasantly smooth texture,
as good luck charms, and as a folk remedy for rheumatism.
Two varieties of the species (var. arguta and var. glabra) are currently recognized in Missouri. These
differ in the number and size of the leaflets, with var. arguta having a larger number of narrower leaflets.
Two varieties of the species (var. arguta and var. glabra) are currently recognized in Missouri. These differ in the number and size of the leaflets, with var. arguta having a larger number of narrower leaflets.
Photographs taken in the Ozark Scenic Riverways, Shannon County, MO., 10-6-03, at Whetstone Creek Conservation Area, Callaway County, MO., 2-19-04, and at Earthquake Hollow Conservation Area, Callaway County, MO., 4-15-04.