Duguetia barteri (Benth.) Chatrou, Changing Genera: 66, 1998

Fig. 25; Map 3H

≡ Annona barteri Benth., Trans. Linn. Soc. London 23(3): 477, 1862.

= Pachypodanthium staudtii (Engl. & Diels) Engl. & Diels var. letestui Pellegr., Bull. Soc. Bot. France 95: 137, 1948. nom. illeg.

= Pachypodanthium tessmannii R.E.Fr., nom. nud.

Type.

Nigeria. Anambra state; Onitsha, Barter C. 445, 1858: holotype: K[K000198875] .

Description.

Tree, 8-40 m tall, d.b.h. 40-60 cm; stilt roots or buttresses absent. Indumentum of stellate or fasciculate hairs; old leafless branches sparsely pubescent to glabrous, young foliate branches sparsely pubescent to densely pubescent. Leaves: petiole 3-7 mm long, 2-3 mm in diameter, densely to sparsely pubescent, grooved, blade inserted on the side of the petiole; blade 10-23 cm long, 3-7 cm wide, ovate to elliptic, apex acuminate to acute, acumen ca. 1 cm long, base cordate to acute, subcoriaceous, below densely pubescent when young and old, above glabrous when young and old, concolorous; midrib sunken or flat, not grooved, above glabrous when young and old, below densely pubescent when young and old; secondary veins 9 to 18 pairs, distinct, glabrous below; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on old leafless branches, appearing axillary, forming on a short peduncle 4-10 mm long. Flowers with 9 perianth parts in 3 whorls, 2 to 5 per inflorescence; pedicel 11-22 mm long, 3-4 mm in diameter, sparsely to densely pubescent; in fruit 1-25 mm long, 1-4 mm in diameter, sparsely to densely pubescent; bracts 2, one basal and one upper in the lower half of pedicel, basal bracts 7-9 mm long; sepals 3, valvate, free, 10-15 mm long, 9-10 mm wide, ovate, apex acute, base truncate, yellowish green to greyish green, densely pubescent outside, glabrous inside, margins flat; petals free, outer petals longer than inner to sub equal; outer petals 3, 10-22 mm long, 5-8 mm wide, elliptic to ovate, apex acute, base truncate, cream to white, margins flat, sparsely pubescent outside, glabrous inside; inner petals 3, imbricate, 15-17 mm long, 4-5 mm wide, elliptic to ovate, apex acute, base truncate, cream, margins flat, pubescent outside, glabrous inside; stamens numerous, ca. 1 mm long, broad; connective discoid, glabrous, red; staminodes absent; carpels free, 50 to 75, ovary ca. 1.5 mm long, stigma globose, glabrous. Fruit pseudosyncarpous, 40-200 mm in diameter, globose to depressed ovoid; individual carpels sessile, 60 to 70 carpels, completely fused, ca. 15 mm long, ca. 7 mm in diameter, globose to ovoid, apex domed-shaped, densely pubescent, longitudinally ribbed with 5 to 6 main ribs, pinkish red when ripe; seed 1 per monocarp, 7-15 mm long, 4-7 mm in diameter, ellipsoid; aril present, pale yellow.

Distribution.

A central African species, from Cameroon to Gabon; in Cameroon known from East, South, Central, Littoral and South-West regions.

Habitat.

In periodically or permanently inundated forests. Altitude 350-600 m a.s.l.

Local and common names known in Cameroon.

ntom (dial. Bagali) (Letouzey 1964).

IUCN conservation status.

Least Concern (LC) (Cosiaux et al. 2019i).

Uses in Cameroon.

None recorded.

Notes.

Duguetia barteri is distinguished by its elliptic to ovate leaves, the midrib not grooved above, inflorescences occurring on a short peduncle in leafless parts of the branches and its fruits with completely fused monocarps.

Specimens examined.

Central Region: Bank of Nyong river 40 km SE of Yaoundé, 3.65°N, 10.78°E, 09 November 1961, Breteler F.J. 2013 (BR,K,P,WAG,YA); Abimoa, 3.57°N, 11.62°E, 04 April 1962, de Bruijn J. s.n. (WAG[WAG0175175]); Bordure du Nyong près du lac de Nkolmaka ( près route Mbalmayo-Akonolinga), 3.51°N, 11.82°E, 22 April 1954, Letouzey R. 304 (P,YA). Littoral Region: Right bank Ouem river near mouth in Sanaga R 6 km SW of Massok, 4.13°N, 10.47°E, 04 April 1965, Leeuwenberg A.J.M. 5377 (BR,K,MO,P,WAG,YA); Tissongo study area 3.57°N, 9.869°E, 01 June 1976, Waterman P.G. 874 (K). South Region: mountain chain Ngovoyang 2 km in forest from Bikiliki village situated between Bipindi and Lolodorf, 3.18°N, 10.52°E, 18 February 2012, Couvreur T.L.P. 393 (WAG,YA); Campo-Ma’an National Park, 2.38°N, 10.06°E, 01 July 2001, van Andel T.R. 3810 (KRIBI,WAG,YA). South-West Region: Ekundu Kundu, 5.15°N, 8.883°E, 30 April 1996, Cheek M. 8274 (K,WAG,YA) .