Xyris bicarinata Griseb.

Xyris bicarinata Griseb. Cat. PI. Cub. 223. 1866
Xyris cubana A. Nilsson. Sv. Vet.-Akad. Handl. 24 14 : 27. 1892. Xyris navicular is var. abbreviate, Malme, Ark. Bot. 13 s : 16. 1913. Xyris bicarinata var. abbreviata Malme, Ark. Bot. 19 19 : 4. 1925.
Perennial, densely tufted; leaves narrowly linear, 15-20 cm. long, 1-1.5 mm. broad, often spirally twisted, acute, smooth or somewhat scabrid beneath, with thickened margins; sheath occupying one sixth to one fifth the length of the leaf, tuberculate-scabrid, dark-chestnutcolored below, much dilated at the base; peduncles usually 30-40 cm. tall, about 0.75 mm. broad, terete or nearly so, bicostate, scabrid on the ridges, elsewhere smooth, the peduncular sheath 5-7 cm. long, chestnut-colored and slightly shining beneath; spike few-flowered, obovoid or ellipsoid, 7-9 mm. long, 3-4.5 mm. thick, the outer barren bracts ovate-elliptic, about 2.5 mm. long, obtuse or rounded at apex, the flowering bracts elliptic, 5-6 mm. long, about 3.5 mm. broad, rounded at the apex or nearly so, entire, ecarinate, pale-rusty, with a rather indistinct elliptic somewhat rusty dorsal area; lateral sepals included, lanceolate, about 5 mm. long, 1-1.25 mm. broad, acute: keel narrow, serrulate-ciliate toward the apex; seeds oblong-ellipsoid, 6 mm. long.
Type locality: [Pinar del Rio], western Cuba. Distribution: Western Cuba and Isla de Pinos.

Xyris bicarinata là một loài thực vật hạt kín trong họ Hoàng đầu. Loài này được Griseb. miêu tả khoa học đầu tiên năm 1866.