Stenostomum involucratum (Urb. & Ekman) Borhidi

Antirhea involucrata Urban & Ekman; Urban, Ark. Bot. 21A^:
84. 1927.
A small tree, the branches terete, the young ones sparsely and minutely pilosulous at the apex and resinous, the internodes mostly short; stipules connate at the base, ovate-rounded, 3.5-4 mm. long, subobtuse; petioles very unequal, 2-15 mm. long, short-pilosulous ; leaf-blades oblong or elliptic-oblong, 2-4 cm. long, and 0.8-1.2 cm. wide or smaller, gradually acuminate to the acute or obtuse apex, obtuse or subacute at the base, thick-membranaceous, glabrous, darkgreen and dull above, the costa subimpressed, the nerves prominulous, paler beneath, the lateral nerves 4 or 5 on each side, prominulous, the veins reticulate; inflorescences borne apparently at the apices of the branchlets, sessile or on peduncles as much as 3 mm. long, 2-flowered, resinous, the bracts 4, verticillate and forming an involucre about the flowers, ovate-rounded, 3 mm. long, the flowers sessile; hypanthium narrowly obovoid, obtusely angulate; calyx 2 mm. long, its 5 lobes linear, subobtuse, 3.5-8 mm. long; corolla purplish or white, 23-45 mm. long, lineartubular, pilosulous outside with minute spreading hairs, the tube 1 mm. thick, glabrous within, the lobes rounded, crispulate, 3 mm. long; anthers inserted in the corolla-throat, sessile, oblonglinear, 2.5 mm. long; style 20-26 mm. long, short-pilose above, the 2 stigmas clavate; ovary 5or 6-celled; fruit red, broadly oval, 12-16 mm. long, 7-13 mm. wide, with fleshy exocarp, the endocarp corneous, 5-10-costate.
Type locality: Calcareous hillsides. La Hatte Gueurmont, near Dessalines, Massif des Cahos, Haiti.
Distribution: Limestone slopes, Hispaniola, at 500 meters or less.

Stenostomum involucratum là một loài thực vật có hoa trong họ Thiến thảo. Loài này được (Urb. & Ekman) Borhidi miêu tả khoa học đầu tiên năm 1993.