Piptostigma oyemense Pellegr., Notul. Syst. (Paris) 14: 75 1950
Creators: name: Couvreur, Thomas L. P.
name: Dagallier, Leo-Paul M. J.
name: Crozier, Francoise
name: Ghogue, Jean-Paul
name: Hoekstra, Paul H.
name: Kamdem, Narcisse G.
name: Johnson, David M.
name: Murray, Nancy A.
name: Sonke, Bonaventure
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Magnoliales
Annonaceae
Piptostigma
Piptostigma oyemense

description: Piptostigma oyemense Pellegr., Notul. Syst. (Paris) 14: 75, 1950 Figs 91, 93; Map 11I Type. Gabon. Woleu-Ntem; Oyem, <i>Le Testu G.M.P.C. 9624</i>, 21 Jun 1934: holotype: P[P00363276]; isotypes: BR[BR0000008802774, BR0000008802446]; BM[BM000553961]; P[P00363274, P00363275]. Description. Tree, 2-6 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 pubescent. Leaves: petiole 3-4 mm long, 1-2 mm in diameter, pubescent, cylindrical, blade inserted on top of the petiole; blade 11-27 cm long, 4-9 cm wide, <b>elliptic</b>, apex acuminate, acumen 0.2-2.5 cm long, <b>base cuneate</b>, papyraceous, below sparsely pubescent when young, glabrous when old, above glabrous when young and old, discolorous, whitish below; midrib impressed, above glabrous when young and old, below pubescent when young, glabrous when old; secondary veins 21 to 29 pairs, glabrous above; tertiary venation percurrent. Individuals bisexual; inflorescence cauliflorous, peduncle like base 7-10 mm long, axial internodes 3-6 mm long, <b>compact</b>, sympodial rachis 27-42 mm long. Flowers with 9 perianth parts in 3 whorls, 1 to 2 per inflorescence; pedicel 11-18 mm long, ca. 1 mm in diameter, pubescent; in fruit ca. 12 mm long, ca. 2 mm in diameter, pubescent; basal bract ca. ca. 4 mm long, 2 mm wide; upper bract ca. 4 mm long, ca. 2 mm wide; sepals 3, valvate, free, 5-6 mm long, 3-4 mm wide, ovate, apex acuminate, base truncate, brown, pubescent outside, glabrous inside, margins flat; petals free, outer petals shorter than inner; outer petals 3, 12-14 mm long, 3-4 mm wide, obovate, apex acuminate, base truncate, light green, margins flat, pubescent outside, glabrous inside; inner petals 3, valvate, <b>40-50 mm long</b>, 5-10 mm wide, elliptic, apex acute, base truncate, pink, margins wavy, pubescent outside, pubescent inside; stamens numerous, in 6 to 8 rows, ca. 1 mm long, broad; connective discoid, glabrous, red; staminodes absent; <b>carpels free, 3</b>, ovary ca. 2 mm long, stigma globose, pubescent. Monocarps sessile, 1 to 3, 30-40 mm long, 25-30 mm in diameter, ellipsoid, apex rounded, <b>pubescent when immature, glabrous when mature</b>, verrucose, not ribbed, white with pink when ripe; seeds 3 to 5 per monocarp, 10-15 mm long, 5-10 mm in diameter, ellipsoid; aril absent. Distribution. Known from Cameroon to Gabon; in Cameroon known from South and South-West regions. Habitat. A rarely collected species in Cameroon; in rain forests on the slope of mountains. Altitude 450-900 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Vulnerable B2ab(iii) (Cosiaux et al. 2019a p). Uses in Cameroon. None reported. Notes. <i>Piptostigma oyemense</i> is characterized by its elliptic leaf blades, glabrous on both sides when old, and its inflorescence usually with a single flower (rarely 2) and 3 carpels. The only other species with a single flower per inflorescence <i>and</i> up few carpels (less than 4) is <i>P. fugax</i>, which has obovate to very narrowly obovate leaf blades, a cuneate leaf base (versus obtuse to acute), a pubescent midrib on the upper ide (versus glabrous), the longer inner petals between 20-40 mm long (versus 40-50 mm) and the tomentose monocarps (versus glabrous when mature). Cheek and Cable (1998, p. 11) mention two specimens as <i>Piptostigma</i> sp. nov. (<i>Akogo 34</i>, <i>Harris 3755</i>) collected from Mont Cameroon. We identified the former as <i>P. oyemense</i>. We did not see <i>Harris 3755</i>. Specimens examined. <b>South Region</b>: Akom II, 2.78°N, 10.55°E, <i>12 December 2013</i>, <i>Kamdem N.</i> 159 (YA). <b>South-West Region</b>: Bomana, 4.28°N, 9.060°E, <i>05 October 1993</i>, <i>Akogo M.</i> 34 (K,YA).
description: Published as part of <i>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. &amp; Sonke, Bonaventure, 2022, Flora of Cameroon - Annonaceae Vol 45, pp. 1-532 in PhytoKeys 207</i> on pages 303-305, DOI: 10.3897/phytokeys.207.61432
description: {"references": ["Le Thomas, A, 1969b. Annonacees. In: Aubreville, A, Ed., Flore du Gabon. Museum National d'Histoire Naturelle, Paris: 1 - 371", "Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019a. Annickia affinis. The IUCN Red List of Threatened Species: e.T132512369A132513599. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T132512369A132513599.en"]}