Monographs Details: Ferdinandusa paraensis Ducke
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. Guianas and northeastern Brazil. BRITISH GUIANA. Basin of Essequibo River, near mouth of Onoro Creek, 1° 35' N, 15-24 Dec 1937, A. C. Smith 2716. SURINAME. Brownsberg, arbor no. 1235, 8 Dec 1924, Herb. no. 6748; Km 10.5, in montibus qui dicuntur Nassau, 18 Mar 1949, Lanjouw & Lindeman 2807; high mixed Wallaba forest, Km 7, camp no 2, Saramacca River headwaters, Maguire 24879; Km 11, in montibus qui dicuntur Nassau, 17 Mar 1949, Lanjouw & Lindeman 2757. FRENCH GUIANA. Rio Oiapoque, immediately west of mouth of Rio Ingarari, 2° 18' N, 52° 38' W, 17 Sep 1960, Irwin, Pires & Westra 48330. BRAZIL. Para: Santa Julia au pied de la Serra de Parintins, Ducke 22862; vicinity of Belem, Sep-Oct 1961, Pires 51812; ad Santa Isabel viae ferreae bragantinae, 6 Sep 1910, Ducke 10865. Terr. Amapa: Oiapoque, campo de aviacao, 29 Sep 1949, Black 49-8172; Serra do Navio, Rio Amapari, lower slopes of Observatorio Ore Body, alt 70-300 m, 8 Nov 1954, Cowan 38163. Amazonas: Manaos, Ducke 22863.

Discussion:

Ferdinandusa paraensis var palustris Ducke, Archiv. Jard. Bot. Rio Janeiro 3: 259. 1922.

Ferdinandusa rudgeoides sensu Bremekamp in Pulle, FI. Suriname 4(1): 137. 1934, not F. rudgeoides (Benth.) Wedd.

Syntype. Belem, Para, Brazil, 22 Jul 1903, R. Siqueira 3671; Gurupa, Para, Brazil, 27 Jul 1916, A. Ducke 16550; prope flumen Xingu, Victoria, Para, 7 Aug 1918, Ducke 17177.

Some of the above specimens have been variously determined as F. c Morant ha (Wedd.) Standi., F. paxii Winkl., and F. rudgeoides (Benth.) Wedd. The Ducke 17177 (cited in original description) has a glabrous hypanthium, whereas Ducke 16550 (also of the original description) has a moderately puberulent hypanthium; Ducke 17177 has moderately or conspicuously pilose or hirsutulous branches of the inflorescence, whereas Ducke 16550 has less conspicuously pilose branches.

Although Bremekamp [in Pulle, Fl. Suriname 4(1): 137. 1934] placed F. paraensis Ducke in synonymy with F. rudgeoides (Benth.) Wedd., study of the Suriname specimens and the syntype material of F. paraensis from Para shows that they pertain to a taxon quite distinct from F. rudgeoides (Benth.) Wedd. of Amazonas, Brazil, and Colombia. Ferdinandusa paraensis has pentamerous flowers, loosely hirsutulous upper margins of the petioles with conspicuous loose hairs, and loosely hirsutulous branchlets, whereas F. rudgeoides has tetramerous flowers, petioles nearly glabrous or with the pubescence sparse, and with the branchlets glabrous or nearly so.

Distribution:Guyana South America| French Guiana South America| Suriname South America| Brazil South America|