Monographs Details: Ferdinandusa sprucei K.Schum.
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. Rio Negro drainage of Amazonas of Venezuela, Colombia, and Brazil. VENEZUELA. Amazonas: along Yavita-Pimichin trail near Yavita, alt 130 m, 10 Jun 1959, Wurdack & Adderley 42925. COLOMBIA. Vaupés: Rio Guainía, Puerto Colombia (opposite Maroa) and vicinity, Raudal Sapo, 2° 40' N, 67° 30' W, alt 242-258 m, 31 Oct-2 Nov 1952, Schultes & Cabrera 18239. Amazonas-Vaupés: Río Apaporis, Soratama (above mouth of Río Kananarí) and vicinity, 0° 5' N, 70° 40' W, alt 272 m, 26 Mar 1952, Schultes & Cabrera 16082. BRAZIL. Amazonas: upper Rio Negro basin, Rio Dimití, base of Cerro Dimití, 12-19 May 1948, Schultes & Lopez 9977; Rio Maturacá, below Salto de Huá, 10-12 Dec 1930, Holt & Blake 514; Salto do Huá, 21-26 Nov 1930, Holt & Blake 474; Igarapé de Chuva, Taracuá, Rio Vaupés, between Ipanoré and confluence with Rio Negro, 11 Nov 1947, Schultes & Pires 9055.

Discussion:

Type. In sylvis humidis ad pedem montis Imeri fluvii Pacimoni, Amazonas, Venezuela, Feb 1854, R. Spruce 3375.

This taxon is characterized by the shortly densely minutely furfuraceous-tomentellose petiole and stem, subcordate to rounded leaf bases, many-nerved leaves with 13-19 pairs of lateral nerves, glandular-ciliolate margins of calyx lobes, and subsessile clusters of the three main portions of the inflorescence.

Schumann describes the corolla [Mart. Fl. Bras. 6(6): 210. 1889] as 30 mm in length, but on the isotype specimen which I have examined at NY, one of the flowers measures 35 mm long. The corolla varies in length on specimens I have examined from 27-37 mm long, the tube 21-31 mm long, and the lobes 4.5-8 mm long. Schumann also states that the disk exceeds the calyx. This holds true on some flowers which have shed their corollas, but on other flowers less mature, where the corolla is still attached, the disk is shorter than the calyx. The disk relationship to calyx does not appear to be a reliable character to use here, as much depends on the age of the flowers as to whether the disk is shorter or longer.

Distribution:Venezuela South America| Colombia South America| Brazil South America|