Piptostigma submontanum Ghogue, Sonke & Couvreur, Pl. Ecol. Evol. 150 (2): 208, 2017

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 : 307-308

Piptostigma submontanum Ghogue, Sonke & Couvreur, Pl. Ecol. Evol. 150 (2): 208, 2017

Fig. 92 ; Map 12B

Type.

Cameroon. South-West Region; Rumpi Mountains, between Lokando and Dikome Balue, 30 km NNW Kumba, Letouzey R.G. 14535, 23 Mar 1976: holotype: YA[YA0002870]; isotype: P[P02032181] .

Description.

Tree, up to 25 m tall, d.b.h. up to 20 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches sparsely pubescent, young foliate branches tomentose. Leaves: petiole 2-4 mm long, 2 mm in diameter, tomentose, cylindrical, blade inserted on top of the petiole; blade 40-49 cm long, 16-23 cm wide, obovate, apex acuminate to mucronate, acumen 0.8-1.3 cm long, base decurrent to cuneate and narrowly cordate, coriaceous, below densely pubescent when young, densely pubescent when old, above pubescent when young, glabrous when old, discolorous, whitish below; midrib impressed, above pubescent when young and old, below pubescent when young and old; secondary veins 58 to 65 pairs, sparsely pubescent above; tertiary venation percurrent. Individuals bisexual; inflorescence cauliflorous, peduncle like base 10-18 mm long, axial internodes 2-5 mm long, compact, sympodial rachis 20-40 mm long. Flowers with 9 perianth parts in 3 whorls, 1 to 4 per inflorescence; pedicel 2-6 mm long, 2-3 mm in diameter, tomentose; in fruit ca. 25 mm long, ca. 4 mm in diameter, tomentose; basal bract 7-8 mm long, ca. 4 mm wide; upper bract 4-6 mm long, ca. 6 mm wide; sepals 3, valvate, free, 5-8 mm long, ca. 5 mm wide, ovate, apex acute, base truncate, brown, pubescent outside, glabrous inside, margins flat; petals free, outer petals shorter than inner; outer petals 3, ca. 5 mm long, ca. 4 mm wide, ovate, apex acute, base truncate, light yellow to red, margins flat, densely pubescent outside, glabrous inside; inner petals 3, valvate, 50-60 mm long, 5-7 mm wide, narrowly elliptic, apex acute, base truncate, margins wavy, densely pubescent outside, glabrous inside; stamens numerous, in 6 to 8 rows, 1 mm long, broad; connective discoid, glabrous, red; staminodes absent; carpels free, 12 to 15, ovary ca. 2 mm long, stigma globose, pubescence not seen. Monocarps sessile, 1 to 2, 20-30 mm long, 10-25 mm in diameter, obovoid, apex rounded, tomentose, bumpy, brown when ripe; seeds 6 to 8 per monocarp, 6-12 mm long, 3-5 mm in diameter, ellipsoid; aril absent.

Distribution.

Endemic to Cameroon; known from the South-West and Littoral regions.

Habitat.

A fairly uncommon species; in submontane rain forests. Altitude 900-1200 m a.s.l.

Local and common names known in Cameroon.

None recorded.

IUCN conservation status.

Endangered (EN) ( Cosiaux et al. 2019a r).

Uses in Cameroon.

None reported.

Notes.

See under P. calophyllum .

Specimens examined.

Littoral Region: Ebo Forest Reserve Djuma camp Djashaka trail, 4.36°N, 10.25°E, 15 February 2013, Couvreur T.L.P. 625 (WAG,YA). South-West Region : Edip to Kodmin ca 1 hour’s walk, 4.96°N, 9.666°E, 02 December 1998, Cheek M. 9177 (K,P,WAG,YA); Mount Kupe Kodmin , 4.96°N, 9.683°E, 21 November 1998, Gosline W.G. 198 (K,P,WAG,YA); Abang road and then right to forest, 4.93°N, 9.731°E, 11 December 1999, Gosline W.G. 256 (K,MO,WAG,YA); Entre Lokando (900 m) et Dikome Balue (1200 m) 30 km NNW-Kumba, 4.85°N, 9.28°E, 23 March 1976, Letouzey R. 14535 (P,YA); Rumpi Hills near Madie River, 4.94°N, 9.123°E, 22 February 1995, Thomas D.W. 10496 (K) .

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 92. Piptostigma mortehani A single monocarp B base of leaf blade, lower side C base of leaf blade, upper side. Piptostigma pilosum D leaf, lower side, note numerous secondary veins E base of leaf blade, upper side F inflorescence with two flowers, side view. Piptostigma submontanum G leaf, lower side, note numerous secondary veins H base of leaf blade, upper side I base of leaf blade, lower side J cauliflorous inflorescence, note compact nature A Bidault 3633, Gabon B, C Couvreur 436, Ebolbom, Cameroon D, E Couvreur 1070, Gabon F Bidault 1414, Gabon G-J Couvreur 625, Ebo, Cameroon. Photos B-E, G-J Thomas L. P. Couvreur A, F Ehoarn Bidault. Tropicos. org, Missouri Botanical Garden.