Monographs Details: Isertia verrucosa (Humb. & Bonpl.) Standl.
Authority: Maguire, Bassett. 1967. The botany of the Guayana Highland--Part VII. Mem. New York Bot. Gard. 17: 1-439.
Family:Rubiaceae
Description:Distribution and Ecology - "Upper Rio Negro Basin, Amazonas, southwestern Venezuela. VENEZUELA. Amazonas: prope San Carlos ad Rio Xegro, Spruce 3041; selvas altas y tupidas de Yavita, alt 128 m, Williams 14141; San Carlos de Rio Negro, alt 100 m, Williams 14582; along Yavita-Pimichin trail near Pimichin, Rio Guainia, alt 120-140 m, Maguire, Wurdack & Bunting 36312; gold mine camp at base of Cerro Yapacana, Rio Orinoco, alt 130 m, Maguire, Cowan & Wurdack 30606.

Discussion:

Cassupa verrucosa Humb. & Bonpl., Pl. Aequin. 1: 43, pl 12. 1806.

Type. Prope San Carlos ad Rio Negro, Humboldt & Bonpland.

This species is distinguished from I. hypoleuca by the thyrsoid or narrowly compressed inflorescence, fewer-branched lateral inflorescences, glabrate or papillate calyx and hypanthium, sparsely puberulent pedicels, rachis and peduncle of inflorescence, and verticillate or subverticillate lateral branches of the inflorescence.

Distribution:Venezuela South America|