Monographs Details: Henriettella heteroneura Gleason
Authority: Maguire, Bassett, et al. 1953. The Botany of the Guayana Highland. Mem. New York Bot. Gard. 8 (2): 87-160.
Description:Latin Diagnosis - Frutex cauliflorus; folia anguste elliptic a vel oblanceolata, 5-pli-nervia, ad basim angustata in petiolum alatum fere ad caulem; flores 4-meri sessiles; hypanthium tenuissime furfuraceum; sepal a late triangularia; petala triangularia acuta.
Species Description - Shrub, the younger branches glabrous, obscurely 4-angled. Leaves glabrous,narrowly elliptic to oblanceolate, up to 14 cm. long and 5 cm. wide, slenderly acuminate, entire, decurrent at base into a winged petiole about 3.5 cm. long, 5-pli-nerved, the outer pair marginal. Flowers 4-merous, sessile in dense fewflowered clusters below the leaves. Hypanthium cup-shaped, 1.7 mm. long to the torus, thin-walled, obscurely ribbed within, very thinly but completely furfuraceous or sublepidote. Calyx-tube scarcely prolonged; sepals very broadly triangular, about 0.5 mm. long from the torus, merely thickened on the back at the tip. Petals triangular, acute from a broad base, 2.4 mm. long, white. Stamens 8, weakly dimorphic; filaments slender, glabrous, 2.8 mm. long; small anthers stoutly oblong, blunt, 1.7 mm. long, the connective raised down the back into a prominent ridge but truncate at base; large anthers similar, 2.2 mm. long; connective similar but prolonged at base into two short dorsal lobes and two minute lateral lobes. Ovary inferior, much depressed or discoid; style straight, slender, glabrous, 4.4 mm. long to the truncate stigma.
TYPE: from Carlo Profundo, summit of Cerro Sipapo, Bassett Maguire & Louis Politi 28293; New York Botanical Garden. The specific name has been chosen to avoid the necessity of a transfer if future investigation proves that the plant i s conspecific with Clidemia heteroneura, a species at present unknown to us.