Monographs Details: Calonyction tuba (Schltdl.) Colla
Authority: Britton, Nathaniel L. Flora Borinqueña.
Description:Species Description - Coastal thickets and mangrove stamps are the habitats of this long, herbaceous vine, and it grows in these situations nearly throughout the West Indies, ranging north into Florida, in continental tropical America, and in the Old World tropics. In Porto Rico it is apparently local, due, perhaps to repeated cutting of the Mangroves for fuel; it has also been observed on the small islands Mona and Cayo Icacos; it exists only within saline influence. Like its relative, the Moonvine or Bejuco de vaca , Calonyction aculeatum, also illustrated in this work, its large, white flowers are nocturnal; in describing that species we give an account of the genus Calonyction. The one here illustrated, when first known botanically, was classified as a Convolvulus, later as an Ipomoea, and this has been accepted by some authors. We have ascertained no Spanish name for this vine. Galonyction Tuba is a smooth, fleshy vine, which may attain a length of 10 meters. Its leaves are broad, approaching orbicular in outline, slender- stalked, pointed, from 6 to 12 centimeters long, with a deeply heart-shaped base, and without teeth or lobes. The stout flower-stalks are shorter than the leaves and bear either 1 flower or sometimes 2; the sepals are ovate-oblong, blunt or pointed, about 2 centimeters long, and without appendages; the tube of the corolla is cylindric, 5 to 8.5 centimeters long, about 6 millimeters thick, the spreading limb about as broad as the length of the tube, with 5, narrow, greenish bands. The fruit is a nearly globular capsule about 3 centimeters in diameter, and splits open when ripe, discharging the few seeds, which are finely hairy on the sides, long-hairy on the angles, nearly globular and about 9 millimeters in diameter.

Discussion:Coast Moonvine Morning-glory Family Convolvulus Tuba Schlechtendal, Linnaea 6: 735. 1831. Ipomoea Tuba G. Don, General History of Plants 4: 271. 1838. Calonyction Tuba Colla, Memoria circa una nueva specie di Calonyction 15. 1840.