Byttneria fluvialis Fryxell & Guadarr.
Descripción
Woody vines, climbing to 3 m, the stems terete, hollow, to 5 m long, very sparsely and minutely pubescent to glabrescent, and beset with widely scattered spines, these retrorse, stout, 2-3 mm long, compressed laterally. Leaf blades elliptic, basally rounded, entire, apically long-acuminate, almost glabrous (except with tufts of hairs in the axils of the secondary nerves abaxially), 8-12 X 2.5-5 cm, 3-nerved from the base, the nerves raised beneath, with a single flat, yellowish nectary near base of midrib abaxially; petioles 5-15 mm long, minutely bearded adaxially, otherwise glabrous; stipules subulate, pubescent, caducous. Flowers whitish or yellowish in 2-5-flowered, subumbellate groups borne on slender axillary peduncles 5-6 mm long, the peduncles 1- 4 per axil; pedicels 2-4 mm, slender, the umbel subtended by 2 or more minute bracts; sepals 5, oblong-apiculate, ca. 3 mm X 1.5 mm, glabrous [other details of flower structure not observable in available mate- rial]. Fruits green, solitary on pedicels ca. 8 mm long, woody, indehiscent, 2-3 cm diam., 5-carpelled, each carpel with 1-3 stout woody spines, the largest 12-15 mm long, almost glabrous.A
Distribución
México (país) EndémicoA
Ecología y Hábitat
Known from four localities in a restricted area in Tabasco where it is abundant, growing in partial shade in semi-permanent standing water in ever-green forest dominated by Bravaisia integerrima (Spreng.) Standl. (vernacular "canacoite," hence "canacoital" for the vegetation type, as the label on the type indicates) and Pachira aquatica Aubl. or in semi-evergreen forests of Bucida buceras L. These forests occur near sea level and have hydromorphic clayey soils with poor drainage (Lopez, 1995; Zamudio & Guadarrama, 1985). Both types of forest are threatened by encroaching agriculture; only the Centla locality has possibilities for conservation.A
Tipo de vegetación
Bosque de otro tipoA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Bibliografía
A. Fryxell & Guadarr. 2001: New Mexican species of Byttneria (Sterculiaceae), Bakeridesia (Malvaceae), and Triumfetta (Tiliaceae). – Brittonia 53(1): 59-65. https://doi.org/10.1007/BF02805397