Isolona pleurocarpa Diels, Bot. Jahrb. Syst. 39: 485 1907
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
Isolona
Isolona pleurocarpa

description: Isolona pleurocarpa Diels, Bot. Jahrb. Syst. 39: 485, 1907 Fig. 38; Map 5F = Isolona leucantha Diels, Bot. Jahrb. Syst. 39: 484, 1907. Type. Cameroon. South Region, Bipindi, Zenker G.A. 3038, Apr 1904: holotype: B[B 10 0154212]; isotypes: BM[BM000546385]; BR[BR0000008802644]; COI[COI00077204]; E[E00259306]; G[G00011566]; GOET[GOET005681]; HBG[HBG518922]; K[K000199011]; L[L-0182762]; M[M0089224]; MO[M0089224]; P[P00363267]; S[S-G-7462]; WAG[WAG0000090]; WU[WU0025864]. Type. Cameroon. South Region; Bipindi, <i>Zenker G.A. 3217</i>, Jul 1904: holotype: B[B 10 0154211]; isotypes BR[BR0000008498991]; G[G00011576 G00011761]; K[K000198837]; S[S10-21236]; WU[WU0025885]. Description. Tree, 15-30 m tall, d.b.h. up to 60 cm; stilt roots or buttresses absent, trunk fluted. Indumentum of simple hairs; old leafless branches glabrous, <b>young foliate branches glabrous.</b> Leaves: petiole 4-12 mm long, 1 mm in diameter, glabrous, <b>grooved towards the base, blade inserted on the side of the petiole</b>; blade 8.5-15.5 cm long, 3-6 cm wide, elliptic to obovate, apex acuminate, acumen 1-1.5 cm long, base decurrent to cuneate, papyraceous to subcoriaceous, below glabrous when young and old, above glabrous when young and old, concolorous; midrib <b>raised above</b>, above glabrous when young and old, below glabrous when young and old; secondary veins 9 to 12 pairs, glabrous below; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on old or young foliate branches, axillary. Flowers with 9 perianth parts in 2 whorls, 1 per inflorescence; pedicel 1-2 mm long, 1 mm in diameter, glabrous; in fruit 30 mm long, 3-4 mm in diameter, glabrous; bracts 3 to 7, several basal and one upper towards the lower half of pedicel, basal bracts ca. 1 mm long, ca. 1 mm wide; upper bracts ca. 1 mm long, ca. 1 mm wide; sepals 3, valvate, free, 2-3 mm long, 2-3 mm wide, ovate, apex acuminate, base truncate, green, <b>glabrous outside, glabrous inside</b>, margins flat; petals basally fused, tube 6-15 mm long, red, inner and outer whorl not differentiated, equal; lobes 10-23 mm long, 5-10 mm wide, ovate, apex acute, bright green-white to yellow, <b>margins wavy, glabrous outside, glabrous inside</b>, spreading horizontally; stamens numerous, in 3 to 4 rows, ca. 2 mm long, broad; connective discoid, glabrous, yellow; staminodes absent; carpels fused into a single structure, ca. 2 mm long, stigma bilobed, slightly capitate, glabrous. Fruit syncarpous, sessile, ca. 50 mm long, ca. 40 mm in diameter, globose, <b>apex rounded, glabrous, rugulose, longitudinally 6-8 ribbed, green when unripe</b>; seeds not counted, 8-10 mm long, 5-7 mm in diameter, ellipsoid; aril absent. Distribution. Known from Nigeria and Cameroon; in Cameroon known from the South and South-West regions. Habitat. An infrequent species; in lowland rain forests on non-inundated soils. Altitude 0-550 m a.s.l. Local and common names known in Cameroon. Avom (<i>van Andel 4177</i>). IUCN conservation status. Endangered (EN) (Cosiaux et al. 2019v). Uses in Cameroon. None reported. Notes. <i>Isolona pleurocarpa</i> is distinguished by the combination of these characters: young leaves glabrous, leaf blade inserted on the side of the petiole and decurrent to narrowly cuneate at base, midrib proximally depressed above, corolla lobes narrowly ovate to ovate with a narrowed base and an acute apex, undulate-wavy on the margins when dried. Specimens examined. <b>South Region</b>: NE of Mt Elephant ca 20 km SE of Kribi, 2.8°N, 10.03°E, <i>10 February 1970</i>, <i>Bos J.J.</i> 6298 (WAG); mountain chain Ngovoyang 42 km in forest from Bikiliki village situated between Bipindi and Lolodorf, 3.18°N, 10.53°E, <i>19 February 2012</i>, <i>Couvreur T.L.P.</i> 402 (WAG,YA); Colline Nkolo Manga (20 km SE Kribi), 2.95°N, 9.916°E, <i>16 April 1968</i>, <i>Letouzey R.</i> 9341 (P,WAG); Elephant Mont, 2.8°N, 10.01°E, <i>22 October 2001</i>, <i>van Andel T.R.</i> 4177 (KRIBI,WAG,YA); Bipindi, 3.08°N, 10.41°E, <i>1895</i>, <i>Zenker G.A.</i> 1716 (B,G,M,P,WAG); Bipindi, 3.08°N, 10.41°E, <i>01 January 1918</i>, <i>Zenker G.A.</i> 22 (P,WAG); Mbiave, 3.21°N, 10.61°E, <i>01 January 1913</i>, <i>Zenker G.A.</i> 267 (A,B,BR,C,G,M,MO,U,WAG); Bipindi, 3.08°N, 10.41°E, <i>01 April 1904</i>, <i>Zenker G.A.</i> 3038 (B,COI,G,K,L,M,MO,P,S,WAG); Bipindi, 3.08°N, 10.41°E, <i>01 July 1904</i>, <i>Zenker G.A.</i> 3217 (B,BR,G,K,L,M,S,WAG); Bipindi, 3.08°N, 10.41°E, <i>01 January 1908</i>, <i>Zenker G.A.</i> 3433 (BR,COI,G,G,L,M,M,MO,P,S); Bipindi, 3.08°N, 10.41°E, <i>01 January 1908</i>, <i>Zenker G.A.</i> 3540 (G,K,L,M,M,MO); Bipindi, 3.08°N, 10.41°E, <i>01 January 1909</i>, <i>Zenker G.A.</i> 3921 (B,BR,COI,COI,G,L,M,M,MO,P,S); Bipindi, 3.08°N, 10.41°E, <i>01 January 1913</i>, <i>Zenker G.A.</i> 4704 (BM,BR,G,K,L,M,P,S); Bipindi, 3.06°N, 10.38°E, <i>01 November 1919</i>, <i>Zenker G.A.</i> 95 (BM). <b>South-West Region</b>: Southern Bakundu Forest 3 km from Kindongi Camp, 4.55°N, 9.416°E, <i>02 May 1972</i>, <i>Leeuwenberg A.J.M.</i> 9784 (B,BR,C,H,K,LD,M,MO,P,WAG,YA); Korup National Park, 5.06°N, 8.783°E, <i>13 April 1978</i>, <i>Thomas D.W.</i> 349 (K).
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 147-148, DOI: 10.3897/phytokeys.207.61432
description: {"references": ["Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019v. Isolona pleurocarpa. The IUCN Red List of Threatened Species: e.T200682A132677929. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T200682A132677929.en"]}