Monographs Details: Ferdinandusa rudgeoides (K.Schum.) Wedd.
Authority: Maguire, Bassett. 1972. The botany of the Guayana Highland--part IX. Mem. New York Bot. Gard. 23: 1-832.
Family:Rubiaceae
Description:Distribution and Ecology - Distribution. Amazonian drainage of Colombia and Brazil. COLOMBIA. Amazonas: Río Popeyacá (tributary of Apaporis between Río Piraparaná and Raudal Yayacopi), near mouth, 0° 20' S, 70° 30' W, 22-26 Feb 1952, Schultes & Cabrera 15551. BRAZIL. Amazonas: Santa Izabel, Rio Negro, Igarapé Dadá, ad ripas inundatas, 9 Nov 1936, Ducke 357; Ilha do Preto, Rio Negro below Barcellos, 8 Feb 1944, Baldwin 3339; Manaos, 17 Feb 1945, Froes 20485; in vicinibus Barra, Prov. Rio Negro, Dec-Mar 1850-51, Spruce 981; secus Rio Negro, inter Barcellos et San Gabriel, Dec 1851, Spruce 1707, 1951. Rondonia: Km 216-219 Madeira-Mamoré railroad near Abuña, savanna forest on periodically flooded ground, basin of Rio Madeira, 10 Jul 1968, Prance, Forero, Coelho, Ramos & Farias 5822; Km 214-215 Madeira-Mamore railroad near Abuna, 13 Jul 1968, Prance, Forero, Wrigley, Ramos & Farias 5928; track between Mutumparana and Rio Madeira, mixed forest, 5 Jul 1968, Prance, Philcox, Forero, Coelho, Ramos & Farias 5555; 3-4 km SW of Mutumparana on railroad to Abuna, basin of Rio Madeira, 2 Jul 1968, Prance, Philcox, Forero, Coelho, Ramos & Farias 5448.

Discussion:

Aspidanthera rudgeoides Benth., Hook. Jour. Bot. 3: 217. 1841.

Gomphosia longiflora Benth., Hook. Jour. Bot. 5: 232. 1853.

Gomphosia longiflora var densiflora Benth., Hook. Jour. Bot. 5: 232. 1853.

Gomphosia longiflora var laxiflora Benth., Hook. Jour. Bot. 5: 232. 1853.

Type. Islands on the Rio Negro, Amazonas, Brazil, Rob. Schomburgk 969.

Schumann [Mart. Fl. Bras. 6(6): 211. 1889] cited the Rob. Schomburgk 969 collection as from “Guiana Anglica,” but the Kew specimen, as well as Bentham’s original description of Aspidanthera rudgeoides (Hook. Jour. Bot. 3: 217. 1841), gives the locality as “Islands in the Rio Negro, Brazil,” and other collections conspecific with this specimen originate from the same area. Later, Bentham cited this Schomburgk collection as Gomphosia longiflora var densiflora (Hook. Jour. Bot. 5: 232. 1853), whereas the Spruce 981, 1707, and 1951 collections were labelled by Bentham as Gomphosia laxiflora as manuscript names and are the specimens upon which he based his Gomphosia longiflora var laxiflora (Hook. Jour. Bot. 5: 232. 1853). Weddell at first recognized Gomphosia as a distinct genus (Ann. Sci. Nat. III. 10: 14. 1848), but later recognized that both Aspidanthera and Gomphosia were congeneric with Ferdinandusa of Pohl (Ann. Sci. Nat. IV. 1: 77. 1854).

Ferdinandusa rugeoides shows some variation, especially in the pubescence of the calyx lobes, peduncles and branches of inflorescence, and presence or absence of glands within the calyx lobes, and such differences are manifest in the Schomburgk 969 and Spruce 981, 1707, and 1951 collections. With respect to the glabrity of the calyx lobes and glabrous hypanthium, short calyx lobes, and sparsely pubescent upper margins of the petioles, the Schomburgk 969 collection resembles the Spruce 1707, 1951 collection closely, whereas the Spruce 981 collection shows more pubescent calyx lobes, pedicels, and branches of the inflorescence.

Schumann regarded F. rudgeoides as a species having glabrous corolla lobes, i e, without any pubescence around the sinus, but actually each lobe of Spruce 981 (type collection of Aspidanthera rudgeoides) shows minute ciliolate hairs grouped along the inner portion of the bilobed part at the apex, whereas in Spruce 1707, 1951 the lobes appear glabrous throughout, although it is possible that some hairs may have been overlooked, due to their extreme minuteness. Ferdinandusa rudgeoides is closely related to F. goudotiana, differing from the latter principally in length of corolla and corolla tube and in length of calyx lobes.

Distribution:Colombia South America| Brazil South America|