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

Autor: 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
Rok vydání: 2022
Předmět:
DOI: 10.5281/zenodo.7228476
Popis: 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, Zenker G.A. 3217, 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, young foliate branches glabrous. Leaves: petiole 4-12 mm long, 1 mm in diameter, glabrous, grooved towards the base, blade inserted on the side of the petiole; 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 raised above, 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, glabrous outside, glabrous inside, 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, margins wavy, glabrous outside, glabrous inside, 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, apex rounded, glabrous, rugulose, longitudinally 6-8 ribbed, green when unripe; 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 (van Andel 4177). IUCN conservation status. Endangered (EN) (Cosiaux et al. 2019v). Uses in Cameroon. None reported. Notes. Isolona pleurocarpa 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. South Region: NE of Mt Elephant ca 20 km SE of Kribi, 2.8°N, 10.03°E, 10 February 1970, Bos J.J. 6298 (WAG); mountain chain Ngovoyang 42 km in forest from Bikiliki village situated between Bipindi and Lolodorf, 3.18°N, 10.53°E, 19 February 2012, Couvreur T.L.P. 402 (WAG,YA); Colline Nkolo Manga (20 km SE Kribi), 2.95°N, 9.916°E, 16 April 1968, Letouzey R. 9341 (P,WAG); Elephant Mont, 2.8°N, 10.01°E, 22 October 2001, van Andel T.R. 4177 (KRIBI,WAG,YA); Bipindi, 3.08°N, 10.41°E, 1895, Zenker G.A. 1716 (B,G,M,P,WAG); Bipindi, 3.08°N, 10.41°E, 01 January 1918, Zenker G.A. 22 (P,WAG); Mbiave, 3.21°N, 10.61°E, 01 January 1913, Zenker G.A. 267 (A,B,BR,C,G,M,MO,U,WAG); Bipindi, 3.08°N, 10.41°E, 01 April 1904, Zenker G.A. 3038 (B,COI,G,K,L,M,MO,P,S,WAG); Bipindi, 3.08°N, 10.41°E, 01 July 1904, Zenker G.A. 3217 (B,BR,G,K,L,M,S,WAG); Bipindi, 3.08°N, 10.41°E, 01 January 1908, Zenker G.A. 3433 (BR,COI,G,G,L,M,M,MO,P,S); Bipindi, 3.08°N, 10.41°E, 01 January 1908, Zenker G.A. 3540 (G,K,L,M,M,MO); Bipindi, 3.08°N, 10.41°E, 01 January 1909, Zenker G.A. 3921 (B,BR,COI,COI,G,L,M,M,MO,P,S); Bipindi, 3.08°N, 10.41°E, 01 January 1913, Zenker G.A. 4704 (BM,BR,G,K,L,M,P,S); Bipindi, 3.06°N, 10.38°E, 01 November 1919, Zenker G.A. 95 (BM). South-West Region: Southern Bakundu Forest 3 km from Kindongi Camp, 4.55°N, 9.416°E, 02 May 1972, Leeuwenberg A.J.M. 9784 (B,BR,C,H,K,LD,M,MO,P,WAG,YA); Korup National Park, 5.06°N, 8.783°E, 13 April 1978, Thomas D.W. 349 (K).
Published as part of 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, pp. 1-532 in PhytoKeys 207 on pages 147-148, DOI: 10.3897/phytokeys.207.61432
{"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"]}
Databáze: OpenAIRE
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