Monographs Details: Ipomoea rubra (Vahl) Millsp.
Authority: Britton, Nathaniel L. Flora Borinqueña.
Description:Species Description - Charles Frederick Millspaugh, who first classified this vine in accordance with modern botanical nomenclature, was a North American botanist, who lived from 1854 to 1923. During the latter part of his life he was Curator of Botany in the Field Museum of Natural History at Chicago, and diligently built up the herbarium of that institution, making numerous trips to the West Indies, visiting Porto Rico in 1899, and recorded his collections in numerous publications. The plant here illustrated is common in wet or moist places in northern or northeastern Porto Rico, prostrate or sometimes twining, ascending to at least 400 meters elevation, its large, usually purple flowers conspicuous. It ranges through the Greater Antilles, through the Lesser Antilles from Guadeloupe to Trinidad, is recorded as widely distributed on the continent from Central America to Paraguay, and grows also in tropical Africa. An account of the genus Ipomoea may be found with our description of Ipomoea polyanthes. Ipomoea rubra is a smooth, or somewhat hairy vine, from 1 to 3 meters long, sometimes nearly covering large areas of moist lands. Its ovate, long-stalked leaves sometimes wavy-margined and from 5 to 15 centimeters long, blunt, or pointed, the base heart-shaped, or arrow-shaped. The flowers are solitary, or few together, on stout stalks, mostly shorter than the leaves; they are subtended by ovate or lance-shaped bracts from 6 to 15 millimeters long, tipped by a weak bristle; the ovate, outer sepals are about as long as the bracts, and also bristle-tipped; the broad corolla is mostly 5 or 6 centimeters long and purple, sometimes smaller, and a plant with yellowish-white corollas has been described, but we have never had the pleasure of seeing it. The nearly globular capsule is about 10 millimeters in diameter, the seeds velvety.

Discussion:Bejuco de puerco Pig-vine Morning-glory Family Convolvulus rubra, Eclogae Americanae 2: 12. 1798. Ipomoea setifera Poiret, in Lamarck, Encyclopedie Methodique Botanique 6: 17. 1804. Ipomoea rubra Millspaugh, Field Museum Botany 2: 86. 1900.