Piptostigma mayndongtsaeanum Ghogue, Sonke & Couvreur, Pl. Ecol. Evol. 150 (2): 201, 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 : 295-296

Piptostigma mayndongtsaeanum Ghogue, Sonke & Couvreur, Pl. Ecol. Evol. 150 (2): 201, 2017

Map 11F

Type.

Cameroon. South-West Region; Korup National Park , van der Burgt R. 689, 25 Aug 2004: holotype: WAG[WAG0204511]; isotypes: BR[BR0000013174750]; P[P06901232] .

Description.

Tree, up to 10 m tall, d.b.h. 17 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches sparsely pubescent. Leaves: petiole 6-8 mm long, 2-3 mm in diameter, pubescent, cylindrical, blade inserted on top of the petiole; blade 23.5-36.5 cm long, 6.5-8.5 cm wide, narrowly to very narrowly elliptic or narrowly obovate (rarely), apex obtuse, base obtuse, papyraceous, below sparsely pubescent when young and old, above glabrous when young and old, discolorous, whitish below; midrib impressed, above pubescent when young and old, below pubescent when young, glabrous when old; secondary veins 22 to 32 pairs, glabrous above; tertiary venation percurrent. Individuals bisexual; inflorescence cauliflorous or ramiflorous on old leafless branches, axillary, peduncle like base 15-30 mm long, axial internodes 1-50 mm long, lax or panicle-like, sympodial rachis 30-100 mm long. Flowers with 9 perianth parts in 3 whorls, 2 to 5 per inflorescence; pedicel 5-7 mm long, ca. 2 mm in diameter, densely pubescent; in fruit 15 mm long, 3 mm in diameter, pubescent; basal bract ca. 3 mm long, ca. 3 mm wide; upper bract ca. 2 mm long, ca. 2 mm wide; sepals 3, valvate, free, 2-3 mm long, 2-3 mm wide, ovate, apex acute, base truncate, brown, pubescent outside, glabrous inside, margins flat; petals free, outer petals shorter than inner; outer petals 3, 5-6 mm long, ca. 5 mm wide, obovate, apex acute, base truncate, pale yellow to cream, margins flat, pubescent outside, glabrous inside; inner petals 3, valvate, 30-40 mm long, 8-10 mm wide, elliptic, apex acute, base truncate, pale yellow to cream, margins wavy, densely pubescent outside, pubescent inside; stamens numerous, in 6 to 8 rows, 1-2 mm long, broad; connective discoid, glabrous, red; staminodes absent; carpels free, 4, ovary ca. 2 mm long, stigma globose, pubescent. Monocarps sessile, 1 to 3, 21-43 mm long, 27-53 mm in diameter, ellipsoid, apex rounded, pubescent, verrucose with short flat projections, not ribbed, light red all over when ripe; seeds up to 6 per monocarp, ca. 16 mm long, ca. 10 mm in diameter, transversely ellipsoid; aril absent.

Distribution.

endemic to Cameroon, known from the South and South-West regions.

Habitat.

A very rare species known from five collections; in primary rain forest on well-drained sandy soils, intermixed with crystalline rocks. Altitude c. 100 m a.s.l.

Local and common names known in Cameroon.

None recorded.

IUCN conservation status.

Least Concern (LC) ( Cosiaux et al. 2019a m).

Uses in Cameroon.

None reported.

Notes.

Piptostigma mayndongtsaeanum differs from other species of the genus by the narrow shape of its leaf blade (from narrowly to very narrowly elliptic) and the shape of its monocarps (transversely ellipsoid).

Specimens examined.

South Region: Campo Ma'an National Park 11 km on trail from Ebinanemeyong village on road 7 km from Nyabessan to Campo town , 2.52°N, 10.32°E, 11 February 2015, Couvreur T.L.P. 672 (P,WAG,YA). South-West Region : Korup National Park Ndian, 5.06°N, 8.866°E, 19 June 2000, Sainge M. 558 (MO); Korup National Park , 5.01°N, 8.85°E, 10 March 1986, Thomas D.W. 5840 (MO); Korup National Park, 5.01°N, 8.8°E, 25 August 2004, van der Burgt X.M. 689 (BR,G,K,MO,P,WAG,YA); Korup National Park, 5.01°N, 8.8°E, 29 October 2005, van der Burgt X.M. 790 (K,WAG,YA) .

Figures

Map 11. A Piptostigma glabrescens B Piptostigma goslineanum C Piptostigma longepilosum D Piptostigma macranthum E Piptostigma macrophyllum F Piptostigma mayndongtsaeanum G Piptostigma mortehanii H Piptostigma multinervium I Piptostigma oyemense. White borders represent region limits in Cameroon; green patches represent protected areas (see methods and Suppl. material 1: Fig. S 1).