Monographs Details: Palicourea crocea var. riparia f. heterodoxia Steyerm.
Authority: Maguire, Bassett. 1972. The botany of the Guayana Highland--part IX. Mem. New York Bot. Gard. 23: 1-832.
Family:Rubiaceae
Description:Latin Diagnosis - A var riparia f riparia hypanthio dense puberulenti vel tomentello recedit; corolla extus dense puberulenti vel tomentella; calyce breviter vel profunde lobato; inflorescentiae ramulis plus minusve pilosis vel puberulentibus.

Discussion:

Intermediate specimens having the hypanthium sparsely to moderately pilosulous with spreading pubescence and the corolla varying from pilosulous with short spreading hairs to glabrate are the following: VENEZUELA (Terr. Delta Amacuro: Bond, Gillin & Brown 146; Rusby & Squires 207. Apure: Borsotti 32. Bolívar: Williams 11590. Guarico: Aristeguieta 5083; Trujillo 5516. Trujillo: Aristeguieta 4075. Anzoategui: Cruxent 85. Amazonas: Medina 264; Holt & Blake 787; Cowan & Wurdack 31589), BRAZIL (Terr. Amapá: Pires & Cavalcante 52478. Pará: Krukoff 5900, 5942), COLOMBIA (André K 1120, 2457), TRINIDAD (Britton & Hazen 377; Williams 11711; Britton 2243; Britton, Broadway & Hazen 281; Dannond s n; Broadway s n).

Other intermediate specimens with corolla and hypanthium glabrous, but inflorescence branches puberulent, are Samuels 509 and Berthoud-Coulon 188 from Suriname, and Leprieur s n from French Guiana. These have the calyx shallowly lobed. Similarly intermediate specimens but with the calyx shallowly lobed are Melinon 72, Leprieur 125, and Melinon 70 from French Guiana, De la Cruz 2039 from British Guiana, Lanjouw 1115 and Maguire 24612, from Suriname, Broadway 9821, 9825, Britton, Hazen & Mendelson 1338, and A. C. Smith 10006 from Trinidad. Specimens with a pilose hypanthium, glabrous corolla, deeply lobed calyx, and puberulent inflorescence branches include the type collection of Psychotria paraensis M.-Arg. from Brazil (Para: in vicinibus Santarum, Nov 1849, Spruce s n), as well as Hostman 376 from Suriname, Britton & Hazen 734 and Steyermark 90917 from Trinidad, and Holton 426 from Colombia.

The isotype specimen of Palicourea riparia (Schomburgk 337) is somewhat intermediate in characters between completely glabrous P. crocea and the puberulent variation, having the hypanthium and corolla exterior glabrous (the tip is slightly puberulous), but the inflorescence branches are minutely puberulent. In P. aurantiaca Miq. the peduncle and inflorescence branches are minutely puberulent, the calyx and hypanthium minutely and sparsely puberulent, and the corolla exterior glabrate. Palicourea stenoclada has been differentiated from P. crocea on the basis of its corymbose fastigiately branched inflorescence, but this does not distinguish it from fastigiately branched inflorescence variations of P. crocea.

Palicourea fastigiata H.B.K. was described as entirely glabrous throughout with the calyx lobes subrotund and obtuse. But specimens originating near the type locality (Atures, Orinoco, Amazonas, Venezuela), such as Holt & Blake 787 from Puerto Ayacucho, Williams 15272 from Tamatama, and Cowan & Wurdack 31589 from Santa Barbara, savanna at the junction of rios Orinoco and Ventuari, show varying amounts of puberulence on the rachis, inflorescence branches, tips of corollas, pedicels, and calyx and hypanthium. On the other hand, Wurdack & Adderley 42681 from San Fernando de Atabapo, not far from the type locality of P. fastigiata, shows completely glabrous parts, as described by H.B.K.