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

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 : 101-103

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) .

Figures

Map 3. A Artabotrys velutinus B Brieya fasciculata C Cleistopholis glauca D Cleistopholis myristiciflora E Cleistopholis patens F Cleistopholis staudtii G Dennettia tripetala H Duguetia barteri I Duguetia confinis. White borders represent region limits in Cameroon; green patches represent protected areas (see methods and Suppl. material 1: Fig. S 1).

Figure 25. Duguetia barteri A flower, side view B flower, bottom view C fruit, note fused monocarps into a syncarpous fruit, referred to as a pseudosyncarp and with dome shaped apex D longitudinal section of fruit, note completely fused monocarps. Duguetia confinis E leaves, upper side F base of leaf blade, upper side G base of leaf blade, lower side, note whitish pubescence representing minute stellate hairs completely covering whole lower side of leaf blade H flowering branch I flower, top view J detail of receptacle, all petals removed A, B Sosef 2138, Gabon C, D Couvreur 393, Ngovayang, Cameroon E-J Couvreur 527, Gabon. Photos Thomas L. P. Couvreur.