Polyceratocarpus pellegrinii Le Thomas, Adansonia ser . 2, 5: 451, 1965

Couvreur, Thomas L. P., Dagallier, Leo-Paul M. J., Crozier, Francoise, Ghogue, Jean-Paul, Hoekstra, Paul H., Kamdem, Narcisse G., Johnson, David M., Murray, Nancy A. & Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, PhytoKeys 207, pp. 1-532 : 316-317

Polyceratocarpus pellegrinii Le Thomas, Adansonia ser. 2, 5: 451, 1965

Figs 95 , 96 ; Map 12E

Type.

Gabon. Ogooué-Lolo; Poungui, Le Testu G.M.P.C. 7754, 10 Dec 1929: lectotype, sheet here designated: P[P00363348]; isotypes: BR[BR0000008805041]; P[P00363347] .

Description.

Tree, 5-6 m tall, d.b.h. up to 10 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches glabrous. Leaves: petiole 5-6 mm long, 2-3 mm in diameter, pubescent, slightly grooved, blade inserted on top of the petiole; blade 13-31 cm long, 3.6-5 cm wide, oblong, apex acuminate, acumen 0.5-1 cm long, base narrowly cuneate to shortly attenuate, coriaceous, below glabrous when young and old, above glabrous when young and old, (concolorous or) discolorous, whitish below; midrib raised above, above glabrous when young and old, below glabrous when young and old; secondary veins 13 to 17 pairs, glabrous above; tertiary venation intermediate. Individuals andromonoecious, male and hermaphrodite inflorescences similar, ramiflorous on old leafless branches, axillary. Flowers with 9 perianth parts in 3 whorls, 1 to 2 per inflorescence; pedicel ca. 10 mm long, 3-4 mm in diameter, pubescent; in fruit 5-6 mm long, 5-6 mm in diameter, pubescent; bract 2-3 mm long, ca. 1 mm wide; sepals 3, valvate, basally or entirely fused, cup shaped, 3-4 mm long, ca. 6 mm wide, triangular to ovate, apex acute, base truncate, green to brown-red, densely pubescent outside, glabrous inside, margins flat; petals free, outer petals longer than inner; outer petals 3, 20-25 mm long, 5-7 mm wide, oblong to elliptic, apex acute, base truncate, yellow, margins flat, pubescent outside, glabrous inside; inner petals 3, valvate, 10-14 mm long, 6-7 mm wide, elliptic to oblong, apex acute, base truncate, yellow, margins flat, pubescent outside, pubescent inside; stamens 160 to 200, in 8 to 10 rows, 1-2 mm long, linear; connective discoid, glabrous, white; staminodes absent; carpels free, 8 to 9, ovary 3-4 mm long, stigma cylindrical, pubescent. Monocarps sessile, 5 to 7, 50-110 mm long, 20-30 mm in diameter, oblong, apex rounded, glabrous, irregularly and transversally ribbed, otherwise smooth, dark green when ripe; seeds 12 to 14 per monocarp, 15-20 mm long, ca. 10 mm in diameter, ellipsoid; aril absent.

Distribution.

From Cameroon to Gabon, and one collection from Democratic Republic of Congo; in Cameroon known from the Littoral and South regions.

Habitat.

An uncommon and rarely collected species in Cameroon; in lowland or premontane primary or old secondary rain forests. Altitude: 0-600 m a.s.l.

Local and common names known in Cameroon.

None recorded.

IUCN conservation status.

Not evaluated.

Uses in Cameroon.

None reported.

Notes.

Polyceratocarpus pellegrinii is distinguished by its conspicuous raised midrib unique within the genus, and yellow flowers (versus white in P. parviflorus , color of P. microtrichus unknown). Le Thomas (1969b) indicates that the fruits are unknown but they have since been collected (e.g. Couvreur 575 from Gabon) and are here described.

Specimens examined.

Littoral Region: Mapubi 30 km before Edea on Yaounde-Edea road On forestry road 5 km direction to Sanaga river, 3.84°N, 10.38°E, 28 February 2018, Couvreur T.L.P. 1178 (MPU,WAG). South Region: 20 km From Kribi N of Lolodorf road (SFIA logging road), 3.01°N, 10.05°E, 15 July 1969, Bos J.J. 5049 (WAG); Ongongondjé Hill (Ambam), 2.38°N, 11.28°E, 27 December 1975, de Wilde J.J.F.E 8718 (BR,K,MO,P,U,WAG,YA); Colline au SE de Ndengué 15 km S d’Ebolowa, 2.78°N, 11.12°E, 26 March 1970, Letouzey R. 10248 (P,YA) .

Figures

Map 12. A Piptostigma pilosum B Piptostigma submontanum C Polyceratocarpus microtrichus D Polyceratocarpus parviflorus E Polyceratocarpus pellegrinii F Sirdavidia solannona G Sphaerocoryne gracilipes H Toussaintia hallei I Uvaria afzelii. White borders represent region limits in Cameroon; green patches represent protected areas (see methods and Suppl. material 1: Fig. S 1).

Figure 95. Polyceratocarpus pellegrinii A flowering branch B detail of bisexual flower, 6 petals removed C stamen D carpel, side view, and detail of ovules E detail of male flower. Polyceratocarpus parviflorus F bisexual flower, 4 petals removed G outer petal, inside view H inner petal, inside view I stamen J carpel, side view, detail of ovules K fruiting branch. Polyceratocarpus microtrichus L flowering branch M bisexual flower, 4 petals removed N stamen, side and from view A-E from Le Testu 7754 F-J from Le Testu 8549 K from Chevalier 21343 L-N from Halle 2279. Drawings by Helene Lamourdedieu, Publications Scientifiques du Museum national d'Histoire naturelle, Paris; modified from Le Thomas (1969 b, pl. 49, p. 279).

Figure 96. Polyceratocarpus microtrichus A leaf, upper side B leaf, lower side C fruits, note white smooth monocarps. Polyceratocarpus parviflorus D detail of bisexual flower showing receptacle, one outer petals and two inner petals removed E habit F flower, top view G fruits, note ribbed monocarps. Polyceratocarpus pellegrinii H fruit, note curved green and irregularly ribbed monocarps I base of trunk J leaf, lower side K base of leaf, upper side, note raised midrib L flower, top view A-C Droissart 1881 D-G Couvreur 1032 H, L Couvreur 575 I-K Couvreur 1178. Photos A-C Vincent Droissart D-L Thomas L. P. Couvreur.