Neostenanthera robsonii Le Thomas, Fl. Gabon No. 16: 196 1969
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
Neostenanthera
Neostenanthera robsonii

description: Neostenanthera robsonii Le Thomas, Fl. Gabon No. 16: 196, 1969 Figs 83, 84; Map 10G Type. Gabon. Ogooué-Lolo; Lastoursville, <i>Le Testu G.M.P.C. 8635</i>, 28 Dec 1930: lectotype, sheet here designated: BM[BM000553861]; isotypes: BM[BM000553860, BM000553862]; BR[BR0000008802705, BR0000008802378]; P[P00363316, P00363315]. Description. Tree, 5-25 m tall, d.b.h. 10-30 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches glabrous, <b>young foliate branches tomentose, brown</b>. Leaves: petiole 7-14 mm long, 1-3 mm in diameter, <b>tomentose brown</b>, slightly grooved to cylindrical, blade inserted on the side of the petiole; blade 7.5-31 cm long, 2.8-10.3 cm wide, oblong to elliptic, apex acuminate to acute, acumen 0.3-2.4 cm long, base rounded to obtuse, papyraceous, <b>below densely pubescent with erect slight curly hairs when young and old</b>, above glabrous when young and old, discolorous, whitish below; midrib impressed, above pubescent when young, glabrous when old, below pubescent when young and old; secondary veins 15 to 24 pairs, pubescent below; tertiary venation percurrent. Individuals bisexual; inflorescences cauliflorous or ramiflorous on old leafless branches, leaf opposed or extra axillary. Flowers with 9 perianth parts in 3 whorls, <b>2 to 8 per inflorescence</b>, <b>peduncle arbuscular-like, 8-26 mm long</b>; pedicel 22-46 mm long, ca. 1 mm in diameter, pubescent; in fruit 30-60 mm long, 3-4 mm in diameter, pubescent; bract 1, basal, ca. 1 mm long, ca. 1 mm wide; sepals 3, valvate, free, ca. 1 mm long, 1-2 mm wide, semiorbicular, apex acuminate, base truncate, brown, pubescent outside, pubescent inside, margins flat; petals free, outer petals longer than inner; outer petals 3, 16.2-23.3 mm long, 3-4.6 mm wide, narrowly triangular, very thick, apex attenuate, base suborbicular and concave, brown, margins flat, pubescent to glabrous outside, densely pubescent inside; inner petals 3, valvate, 5.6-6 mm long, 1.4-2.9 mm wide, triangular, apex acute, base broad and concave, margins flat, pubescent outside, glabrous inside; stamens 160 to 170, in 5 to 6 rows, 2 mm long, linear; connective tongue shaped, glabrous, brown; staminodes absent; carpels free, ca. 144, ovary ca. 1 mm long, stigma filiform, glabrous. <b>Monocarps stipitate</b>, stipes 10-50 mm long, 1-2 mm in diameter; monocarps 19 to 144, 9-14 mm long, 5-10 mm in diameter, ellipsoid, apex apiculate, <b>densely pubescent</b>, smooth, not ribbed, brown when ripe; seed 1 per monocarp, 7-12 mm long, 4-8 mm in diameter, ellipsoid; aril absent. Distribution. Southern Cameroon and Gabon; in Cameroon known from the South region. Habitat. A rare species in Cameroon; in primary or old secondary rain forests on non-inundated soils. Altitude 200-800 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Least Concern (LC) (Cosiaux et al. 2019a e). Uses in Cameroon. None reported. Notes. <i>Neostenanthera robsonii</i> is distinguished by the brown tomentose indumentum covering most of its parts, and the usually cauliflorous inflorescences with arbuscular-like peduncles. This species was first considered endemic to Gabon (Le Thomas 1969b), but has since been collected in Cameroon (e.g. <i>Lachenaud 659</i>, 2009). Specimens examined. <b>South Region</b>: Campo Ma’an National Park 11 km on trail from Ebinanemeyong village on road 7 km from Nyabessan to Campo town, 2.48°N, 10.33°E, <i>11 February 2015</i>, <i>Couvreur T.L.P.</i> 675 (WAG,YA); Campo Ma’an National Park 11 km on trail from Ebinanemeyong village on road 7 km from Nyabessan to Campo town, 2.48°N, 10.34°E, <i>11 February 2015</i>, <i>Couvreur T.L.P.</i> 678 (WAG,YA); Efoulan au sud d’Akom II (mi-chemin entre Ebolowa et Kribi), 2.76°N, 10.53°E, <i>09 May 2009</i>, <i>Lachenaud O.L.</i> 659 (BR,BR,WAG,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 275-277, DOI: 10.3897/phytokeys.207.61432
description: {"references": ["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", "Le Thomas, A, 1969b. Annonacees. In: Aubreville, A, Ed., Flore du Gabon. Museum National d'Histoire Naturelle, Paris: 1 - 371"]}