Aesculus glabra Willd.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Small tree to 15 m; lfls 5(–7), bright or yellowish-green, oblanceolate to obovate, 6–16 × 3–6 cm, acute or acuminate, serrate, with conspicuous tufts of hair in the vein-axils beneath; infls 1–1.5 dm; cal 5–8 mm; pet 4, greenish-yellow, 1–2 cm, the 2 uppermost oblanceolate, slightly exceeding the 2 lateral, gradually tapering to the claw, the lateral with elliptic-oblong to elliptic-ovate blade and slender claw; stamens 7, often twice as long as the cor; fr generally echinate, 3–4 cm thick; 2n=40. Moist but fairly well drained, chiefly alluvial, often calcareous soil; w. Pa. to s. Ont., s. Wis., Io., and Kans., s. to Tenn., n. Ala., Ark., and Tex. Apr., May. Our plants, as here described, are var. glabra.