Manettia lygistum (L.) Sw.

Manettia lygistum (L.) Sw. Prodr. 37. 1788
Petesia Lygistum L. Syst. Nat. ed. 10. 894. 1759.
Lygistum axillare Lam. Tab. Encyc. 1: 286. 1791.
Gonzalea Lygistum Schultes, in R. & S. Syst. Veg. Mant. 3: 132. 1827.
Manettia lygistoides Griseb. Mem. Am. Acad. II. 8: 505. 1862.
Manettia Lygistum lygistoides K. Schumann, in Mart. Fi. Bras. 6 6 : 180. 1889.
Stems herbaceous or suffrutescent at the base, stout, angulate, retrorse-pilose, puberulent, or glabrate, the internodes usually short; stipule-sheath short, the lobes acute or truncate, glandular-ciliate; petioles stout, 2-10 mm. long; leaf-blades usually rounded-ovate, sometimes ovate or lance-ovate, 2-4.5 cm. long, 1-3 cm. wide, broadly rounded or subcordate at the base, acute or acuminate or sometimes very obtuse or rounded and subcuspidate, usually coriaceous, lustrous above, glabrous, the primary veins usually impressed, sparsely sordid-villous beneath along the veins, the lateral veins very prominent, arcuate, the secondary veins usually prominently reticulate on both surfaces, the margins often revolute; inflorescence usually axillary, cymose, 3-5-flowered or sometimes 1-flowered, the cymes short-pedunculate, the pedicels 2-5 mm. long; hypanthium 3 mm. long, sparsely viscid-villosulous or glabrate, the 4 calyxlobes ovate or triangular, 1.5-2.5 mm. long, acute, viscid-ciliate, alternating with small teeth; corolla blue, subsalverform, more or less villosulous outside, the tube stout, 10-12 mm. long, villous within in the upper part, the lobes deltoid-ovate, about 4 mm. long, acutish, minutely papillose within; stamens inserted in the corolla-throat, exserted, the anthers 1-1.5 mm. long; capsule about 4 mm. in diameter, coriaceous, blue or blackish; seeds 1-2 mm. long, dark-brown.
Type locality: Jamaica.
Distribution: Mountains of Cuba, Jamaica, and Haiti; also in Venezuela and the Guianas.

Manettia lygistum là một loài thực vật có hoa trong họ Thiến thảo. Loài này được (L.) Sw. mô tả khoa học đầu tiên năm 1788.