STYRACEA. SILVA OF NORTH AMERICA. 19 
MOHRODENDRON. 
FLowErs regular, perfect; calyx 4-toothed, the teeth not closed in estivation ; 
corolla gamopetalous, 4-lobed or divided nearly to the base, the lobes convolute or 
imbricated in estivation; stamens definite, in a single series; anthers adnate; disk 0; 
ovary mostly inferior, 2 to 4-celled; ovules 4 in each cell. Fruit drupaceous, 2 to 
4-winged. Leaves alternate, membranaceous, denticulate, destitute of stipules. 
Mohrodendron, Britton, Garden and Forest, vi. 463 (excl. Pterostyrax). — Engler & Prantl, Pflanzenfam. iv. 
(1893). pt. i. 177 (excel. Pterostyrax). — Baillon, Hist. Pl. xi. 460 
Halesia, Linnzus, Syst. Nat. ed. 10, 1044 (not Browne) (excl. Pterostyrazx). 
(1759) ; Gen. ed. 6, 237. — Adanson, Fam. Pl. ii. 158.— Mohria, Britton, Garden and Forest, vi. 434 (not Swartz) 
A. L. de Jussieu, Gen. 156. — Meisner, Gen. 250. — (1893). 
Endlicher, Gen. 744. — Bentham & Hooker, Gen. ii. 669 Carlomohria, Greene, Hrythea, i. 246 (1893). 
Trees or shrubs, with slender terete pithy branchlets, buds covered with imbricated accrescent 
scales, and fibrous roots, the young branchlets and leaves clothed with soft stellate pubescence. Leaves 
involute in vernation, membranaceous, ovate-oblong, acute, denticulate, penniveined, deciduous, destitute 
of stipules. Flowers appearing in early spring with the unfolding of the leaves in fascicles or short 
racemes produced in the axils of leaves of the previous year. Pedicels slender, elongated, drooping, 
pubescent, developed in the axils of foliaceous obovate or acute caducous bracts, ebracteolate. Calyx- 
tube obconical or obpyramidal, four-ribbed, adnate to the ovary, coated with thick pale tomentum, the 
limb short, four-toothed, the teeth open in the bud. Corolla campanulate, epigynous, four-lobed or 
divided nearly to the base, thin and white, sometimes puberulous on the outer surface. Stamens eight 
to sixteen; filaments inserted on and slightly attached to the base of the corolla or sometimes free, 
flattened below, glabrous or tomentose; anthers oblong, adnate or free at the very base, introrse, 
two-celled, the cells opening longitudinally. Ovary two to four-celled, gradually contracted into an 
elongated glabrous or tomentose simple style stigmatic at the apex; ovules four in each cell, attached 
by elongated funiculi at the middle of the axis, the two upper ascending, the two lower pendulous, 
anatropous; raphe dorsal; micropyle inferior and superior. Fruit drupaceous, indehiscent, elongated, 
obovate, gradually narrowed at the base, crowned with the calyx-limb and the thickened persistent style ; 
epicarp tough, separable, light green and lustrous, turning reddish brown late in the autumn; endocarp 
thick and fleshy, becoming dry and corky at maturity, produced into two or four broad thin wings 
wedge-shaped at the base and rounded at the apex; putamen thick and bony, obovate, gradually nar- 
rowed at the base into an elongated slender stipe inclosed in the wings, tipped with the bony remnants 
of the style, usually irregularly eight-angled or sulcate, one to four-celled. Seed solitary in each cell, 
elongated, cylindrical ; testa thin, light brown, lustrous, adherent to the walls of the stone, the delicate 
inner coat attached to the copious fleshy albumen. Embryo terete, axile, erect ; cotyledons oblong, as 
long as the elongated radicle turned towards the minute hilum. 
Mohrodendron is confined to the southern Atlantic region of North America, where three species 
occur; of these two are trees and the third, Mohrodendron parviflorum,' is a shrub of southern 
Georgia and northern Florida. 
1 Britton, Garden and Forest, vi. 463 (1893). Chapman, Fl. 272. — Miers, Contrib. i. 194. — Gray, Syn. Fl. N. 
Halesia parviflora, Michaux, Fl. Bor.-Am. ii. 40 (1803). — Per- Am. ii. pt. i. 71. , 
soon, Syn. ii. 4.— Pursh, Fl. Am. Sept. ii. 450.— Nuttall, Gen. Mohria parviflora, Britton, 1. c. 434 (1893). 
ii. 83.— Don, Gen. Syst. iv. 6.— Loudon, Arb. Brit. ii. 1190 Carlomohria parviflora, Greene, Erythea, i. 246 (1893). 
(excl. Bot. Reg. xi. t. 952).— A. de Candolle, Prodr. viii. 270. — 
