Sabicea crystallina subsp. crystallina

Zemagho, Lise A., Liede-Schumann, Sigrid, Lachenaud, Olivier, Dessein, Steven & Sonke, Bonaventure, 2017, Taxonomic revision of Sabicea subgenus Anisophyllae (Ixoroideae, Rubiaceae) from Tropical Africa, with four new species, Phytotaxa 293 (1), pp. 448-450 : 448-450

publication ID	https://doi.org/ 10.11646/phytotaxa.293.1.1
persistent identifier	https://treatment.plazi.org/id/038287FF-0366-D661-72A5-F9984332F9C2
treatment provided by	Felipe
scientific name	Sabicea crystallina subsp. crystallina
status

Treatment

6a. Sabicea crystallina subsp. crystallina View in CoL ( Fig. 12 View FIGURE 12 )

Stems, petioles and upper side of leaf blade glabrous or sparsely villose. Stipules with free part 5–23 x 1.2–5 mm. Bracts ca. 1.5 x 1.5 mm, bracteoles 1.5–3 x 0.2–0.5 mm. Calyx tube glabrous outside; lobes 2–4.5 x 0.3–1 mm, glabrous or sparsely villose on the margin only. Corolla glabrous outside or sometimes with very sparse stiff hairs near the apex of the lobes.

Distribution: —Lower Guinea Domain. Restricted to Equatorial Guinea and northwestern Gabon (Cristal Mountains and their foothills) ( Fig. 13 View FIGURE 13 ).

Habit and ecology: —Open areas in wet evergreen forest; at 60–550 m altitude.

Phenology: —Flowers in November and December; immature fruits from November to April.

Notes: —The specimen N.Hallé 2368 (P) from Abanga, Gabon, probably belongs here but lacks flowers and

TAXONOMIC REVISION OF SABICEA SUBGENUS ANISOPHYLLAE

fruits, and cannot be identified with certainty.

ZEMAGHO ET AL.

Conservation status:— IUCN Red List Category: Near-Threatened [NT]. The extent of occurrence is estimated as 3037.849 km 2 and the area of occupancy at 36 km 2, respectively within the limit for Vulnerable and Endangered under criteria B1 and B2. The taxon is known from 8 subpopulations representing 6 locations. Four of the subpopulations are situated in national parks (Monte Alén N.P. in Equatorial Guinea, and Monts de Cristal N.P. in Gabon). The situation of S. crystallina subsp. crystallina is thus very comparable to that of the species as a whole, and the taxon is assessed to be Near-threatened for the same reasons.

Additional specimens examined:— EQUATORIAL GUINEA. De Sendje à Ongamnsok , 19 February 2001, J. Lejoly 01/16 ( BRLU) ; Region continentale: Monte Mitra , 30 November 1997, C. Obama 341 ( BRLU, WAG) ; 19 km au N de Mitong , 15 December 2003, B. Sonké & P. Esono 3192 ( BR) . GABON. South of Tchimbélé dam, 6 February 2008, S. Dessein, O. Lachenaud, S. Janssens, Y. Issembe & T. Nzabi 1721 ( BR, WAG) ; Nkan, Monts de Cristal , 31 January 1968, N. Hallé & J.F. Villiers 4794 (P); 5 km sur la route forestière, 1 km droite direction Libreville sur la route Asok–Kougouleu , 17 November 1982, A.M. Louis 116 ( WAG) ; Tchimbélé dam, monts de Cristal, road N of dam, 0.4 km N of dam, 12 November 2000, G. Walters 505 ( BR, MO, WAG) ; Estuaire: Ekorado Village, Mitemboni River , 26 April 2001, G. Walters 553 ( BR, MO, WAG) ; Crystal Mountains, Tchimbélé , ½ km SE of dam, 19 December 1989, J.J. Wieringa 253 ( MO, WAG) .