Uvariastrum germainii Boutique, Bull. Jard. Bot. Etat Bruxelles 21: 120. 1951., Boutique, Bull. Jard. Bot. État Bruxelles 21: 120. 1951.
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|Uvariastrum germainii Boutique, Bull. Jard. Bot. Etat Bruxelles 21: 120. 1951.|
Democratic Republic of Congo. Orientale: Yangambi, 29 Feb 1910, R.G.A. Germain 213 (lectotype, designated here: BR! [BR8824400]; isolectotypes: BR! [BR8824417], FT! [FT001090], K! [K000198809], P! [P00315823, P00315825], US! [accession number US00104141]).
Tree, up to 25 m tall, up to 50 cm in diameter, stem cylindrical; old branches glabrous; young branches glabrous to sparsely pubescent quickly becoming glabrous, hairs ca. 0.1 mm long, erect to appressed, brown. Petioles 4-7 mm long, ca. 1 mm in diameter, glabrous or sparsely pubescent, quickly becoming glabrous, leaf lamina inserted on top, weakly grooved adaxially. Leaf lamina 6-10 cm long, 2-3 cm wide, length:width ratio 2.5-4, narrowly elliptic to elliptic, coriaceous, glabrous on both sides, base cuneate, apex cuneate to acuminate, acumen ca. 1 cm long; midrib glabrous on both sides; secondary veins 10-12, glabrous, hardly visible adaxially, slightly raised abaxially, curving upwards and anastomizing near margin; margins wavy. Raphidia 1(-2), on leafy or older branches, no report of cauliflory. Flower buds up to 1 cm long, 1 cm in diameter, margins clearly folded outwards. Bracts soon falling, not seen. Flowering pedicel 0.7-1.5 cm long, ca. 1 mm in diameter, densely pubescent, hairs ca. 0.5 mm long, appressed, light brown. Sepals 1-1.5 cm long, 0.5-1 cm wide, length:width ratio 1-1.5, very broadly ovate to broadly ovate, base truncate, apex acute, densely pubescent outside, same as on pedicel, tomentose inside, glabrous towards the center; outside light brown, inside light brown along margins, black in center in herbarium material. Outer petals 1.3-3 cm long, 0.5-1.2 cm wide, length:width ratio 1.8-3, elliptic to broadly elliptic, base truncate, apex acute, densely pubescent outside, more so along central vein, hairs ca. 0.3 mm long, appressed, light brown, tomentose inside. Inner petals 1-2 cm long, 0.5-1 cm wide, length:width ratio 1.7-2, elliptic, base truncate, apex acute, pubescence same as outer petals; petals light brown in herbarium material, yellow on fresh material. Stamens ca. 4 mm long, connective ca. 0.6 mm long, tongue shaped. Carpels ca. 9, 4 mm long, 1 mm in diameter, densely pubescent, hairs ca. 0.7 mm long, appressed upwards, stigma bilobed, ca. 1 mm in diameter, glabrous. Fruiting pedicel 1-4 cm long, 3-4 mm in diameter, glabrous, woody. Monocarps 3-8, 2.5-7 cm long, 1.5-2 cm in diameter, ellipsoid, straight to curving, glabrous or very sparsely pubescent, many to few irregularly longitudinal ribs, resembling a peanut; stipe 3-8 mm long, ca. 5 mm in diameter; rostre ca. 5 mm long. Seeds 3-5 per monocarp, 0.7-1.4 cm long, ca. 1 cm in diameter, broadly ellipsoid, not flattened, testa bark brown on herbarium material, raphe raised, hilum ca. 4 mm long, ca. 1 mm wide, narrowly elliptic.
Gabon, Central African Republic, Republic of Congo and Democratic Republic of Congo, mainly in the Congo basin. ( Figure 6 View Figure 6 ).
Habitat and ecology.
This species is found in Gilbertiodendron J. Léonard forests as well as in semi-deciduous forests. One collection indicates a habitat on white sand on a river bank (Germain 412); 400-900 m.
Mature flowers collected from Feb to Mar, Jun, Aug and Oct. Mature fruits collected in Jan, May to Jun and Oct.
Preliminary IUCN conservation status.
VUB2ab(iii): Uvariastrum germainii is moderately represented in herbaria, and has an Area of Occupancy less than 60 km² with just nine localities. Although it is found in several protected areas (Dzanga-Sangha, Central African Republic; Nouablé-Ndoki National Park, Republic of Congo) it is highly fragmented in distribution (although this might be linked to collecting effort). The vulnerable category thus seems applicable.
Democratic Republic of Congo: Loopa lo nénu (Turumbu people Lombo language, Germain 213, 412); Mosangui (Gambe language, Leontovitch 113).
This species somewhat resembles Uvariastrum pierreanum in the small size of its leaves, but can be distinguished by the longer petioles (4-7 mm vs 2-4 mm), long acuminate leaf apex and tongue-shaped connectives of the stamens. In addition, the fruits of Uvariastrum germainii are clearly ribbed and glabrous, compared to the smooth and pubescent fruits of Uvariastrum pierreanum .
Central African Republic. Sangha-Mbaere: Kongana research camp, 25 km SE of Bayanga. 31 May 1994, Harris, D.J. 5002 (E); Kongana research camp, 25 km SE of Bayanga. 7 Feb 1994, Harris, D.J. 4505 (E); Madibwé, close to St. Francois road, c. 12 km NE of Bayanga. 3 May 2001, Harris, D.J. 7526 (E); Bai Hoku, 25 km E of Bayanga. 17 Aug 1995, Remis, M. 101-95 (E).
Democratic Republic of Congo. Equateur: Djoa, 17 Oct 1958, Evrard, C.M. 5064 (BR); Dua-Ebola, 28 Aug 1938, Leontovitch, C. 113 (BR); Dundusana, Feb 1913, Reygaert, F.J. 53 (BR); Bokome/Tushuapa, 22 Jan 1959, Evrard, C.M. 5594 (K); Kasai-Oriental: lotissement de Shinga II, Jun 1952, Germain, R.G.A. 7648 (BR, EA); Maniema: entre Nyangwe-Malela, Aug 1932, Lebrun, J.-.P.A. 5977 (BR, K, P); Orientale: Yangambi, Réserve forestière, vallée de la Luweo, 29 Feb 1940, Germain, R.G.A. 213 (BR, FT, K, P, US); Yangambi, 1948, Gilbert, G.C.C. 9375 (P); 1 May 1948, Germain, R.G.A. 936 (P); Yangambi, RFI, vallée de Luweo, 1 Mar 1943, Germain, R.G.A. 412 (BR, P); Yangambi, 2 Oct 1952, Madoux, E. 453 (BR); 1950, Gilbert, G.C.C. 9347 (BR, S); Yangambi, vallée de la Luweo, May 1952, Toussaint, L. 929 (BR).
Gabon. Ogooué-Ivindo: Boka-Boka, piste menant au Mt Bengoué, 4 Mar 1979, Florence, J. 1723 (P).
Republic of Congo. Niari: chantier à 4 km de Moukoudi, sur route de Mougala, 27 Oct 1975, Sita, P. 3939 (BR, P); Sangha: Nouablé-Ndoki National Park, Goualougo Study Site, 36.62 km E de Bomassa, 375m, 27 Mar 2008, Ndolo Ebika, S.T. 311 (E, IEC, WAG); Nouablé-Ndoki National Park, Goualougo Study Site, 38.33 km E-SE de Bomassa, 391m, 15 Sep 2008, Ndolo Ebika, S.T. 387 (E, IEC, WAG); Likouala: North side of Sombo stream, 8 km N of Makao, 150 km NW of Impfondo. 22 Apr 1995 Harris, D.J. 5268 (E).
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