158 NORTH AMERICAN FLORA [Volume 32 



60. DUROIA h. f. Suppl. 30, 209. 1781. 



Schachtia Karst. Linnaea 30: 156. 1859. 



Shrubs or trees, glabrous or pubescent, the branchlets terete or tetragonous. Leaves 

 opposite or verticillate, sessile or petiolate, coriaceous or chartaceous. Stipules interpetiolar, 

 oblong, deciduous. Flowers often large, white or yellowish, dioecious, arranged in terminal, 

 sessile or pedunculate fascicles or cymes, the pistillate rarely solitary; hypanthium oblong to 

 hemispheric; calyx cupular or tubular, persistent, truncate or divided into 6-9 lobes; corolla 

 salverform, thick, sericeous outside, the throat pilose or naked, the limb 6-9-lobate, the lobes 

 oblong, contorted. Stamens 6-9, inserted in the corolla-tube; filaments very short or wanting; 

 anthers dorsifixed, linear, acute, included. Disk annular or explanate. Ovary 2-4-celled; 

 style short, thickened above, with 2 broad acute coherent branches; ovules numerous, biseriate, 

 the placentae affixed to the septum. Fruit baccate, globose to oblong, with a thick cortex, 2-4- 

 celled or 1 -celled. Seeds large, horizontal, much compressed, suborbicular, covered with 

 pulp, the testa thin, black; endosperm fleshy; embryo small, the cotyledons ovate, plane; 

 radicle clavate. 



Type species, Duroia eriopila L. f. 



1 . Duroia costaricensis Standley, Contr. U. S. Nat. 

 Herb. 20: 208. 1919. 



Branchlets stout, hirsute, densely leafy at the ends; leaves opposite, the petioles stout, 



7 mm. long or shorter, densely hirsute, the blades oblong-obovate, 10-17.5 cm. long, 3.5-6.5 cm. 



wide, cuneately narrowed to the base, obtuse at the apex and abruptly cuspidate-acuminate, 



with a narrow falcate acumen, chartaceous, copiously hirsute with slender fulvous hairs, 



the venation prominent beneath, the lateral veins slender, 7 or 8 on each side, the margin 



plane; staminate flowers fasciculate-cymose at the ends of the branchlets, short-pedicellate; 



calyx and hypanthium very densely hirsute with pale brownish hairs; hypanthium 1.5 mm. 



long, the calyx 4—4.5 mm. long, densely whitish-sericeous within, the lobes 6 or 7, distant, 



linear-subulate, as long as the limb; corolla (in bud) 14 mm. long, densely sericeous outside, 



the tube stout, glabrous or nearly so within, the 6 lobes lance-oblong, acutish, longer than the 



tube, finely sericeous within; anthers sessile, 4 mm. long. 



Type locality: Marais de Sierpe, Costa Rica. 

 Distribution: Known only from the type locality. 



61. STACHYARRHENA Hook. f. in Hook. Ic. 11: 54. 1870. 



Small trees, glabrous throughout, the branchlets terete. Leaves opposite, petiolate, 

 coriaceous. Stipules short, intrapetiolar, connate, subpersistent, glandular within. Flowers 

 dioecious, small, ebracteolate, the staminate fasciculate in narrow terminal spikes, the pistil- 

 late solitary; calyx of th estaminate flower cupular, truncate or obscurely 5-dentate, persistent, 

 the corolla funnelform or tubular, coriaceous, glabrous outside, the tube villous within in the 

 upper part, the limb 5-lobate, the lobes short, contorted. Stamens 5, inserted in the corolla- 

 throat, included; anthers linear, sessile, dorsifixed. Style (in the staminate flower) short, 

 the stigma fusiform, acute, pilose. Ovary 4-many-celled ; ovules very numerous, the placentae 

 bilamellate, affixed to the axis of the ovary. Fruit baccate, small, short-pedicellate, globose, 

 4-celled, the pedicel involucellate at the base. Seeds horizontal, plane, the testa thin, sub- 

 fibrous. 



Type species, Stachyarrhena spicata Hook. f. 



1 . Stachyarrhena heterochroa Standley, Contr. U. S. Nat. 

 Herb. 18: 142. 1916. 



Tree, 8-10 meters high, with straight trunk, radiate branches, and pyramidal crown, 

 glabrous throughout, the bark grayish, smooth, the branchlets stout; stipules 2-3 mm. long, 

 forming a truncate sheath; petioles stout, 2-3 cm. long; leaf -blades narrowly elliptic-oblong 

 or oblanceolate-oblong, 15-28 cm. long, 5-9 cm. wide, acute at the base, short-acuminate or 

 cuspidate-acuminate at the apex, lustrous on the upper surface, the venation prominent, dull 



