Isolona dewevrei Engl. &amp; Diels, Monogr. Afrik. Pflanzen. - Fam. 6: 83 1901
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 dewevrei

description: Isolona dewevrei (De Wild. &amp; T. Durand) Engl. &amp; Diels, Monogr. Afrik. Pflanzen.-Fam. 6: 83, 1901 Fig. 36; Map 5C ≡ Monodora dewevrei De Wild. &amp; T. Durand, Bull. Soc. Roy. Bot. Belg., Compt. Rend. 38: 11, 1899. Type. Democratic Republic of the Congo. Bas Congo; Lemba-Luki, <i>Dewèvre A.P. 365</i> , no date: lectotype, sheet here designated: BR[BR0000008801050]; isotypes: BR[BR0000008799968, BR0000008800725, BR0000008799630]. Description. Tree to shrub, 8-15 m tall, d.b.h. 20 cm; stilt roots or buttresses absent. <b>Indumentum of simple hairs</b>; old leafless branches glabrous, young foliate branches glabrous. Leaves: petiole 4-15 mm long, 1-2 mm in diameter, glabrous, grooved, <b>blade inserted on the side of the petiole</b>; blade 10-17 cm long, 4-7 cm wide, elliptic to obovate, apex acuminate, acumen ca. 1 cm long, base decurrent to cuneate, papyraceous, below glabrous when young and old, above glabrous when young and old, concolorous; midrib raised, above glabrous when young and old, below glabrous when young and old; secondary veins 9 to 14 pairs, glabrous below; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on old branches, axillary. Flowers with 9 perianth parts in 2 whorls, 1 per inflorescence; pedicel 2-7 mm long, 1 mm in diameter, <b>sparsely pubescent</b>; in fruit 9-10 mm long, 2-3 mm in diameter, glabrous; bracts 3 to 5, several basal and one upper towards the lower half of pedicel, basal bracts 1 mm long, 0.5-1 mm wide; upper bract 1 mm long, 1 mm wide; sepals 3, valvate, free, 2-3 mm long, 3-4 mm wide, ovate, apex acuminate, base truncate, glabrous outside, glabrous inside, margins flat; petals basally fused, tube 3-4 mm long, inner and outer whorl not differentiated, equal; lobes 7-17 mm long, 5-7 mm wide, <b>elliptic, apex rounded, green, margins flat</b>, overall glabrous but pubescent towards margins outside and inside; <b>margins curved outwards</b>; stamens ca. 50, in 3 to 4 rows, 2 mm long, broad; connective discoid, glabrous; staminodes absent; carpels fused into a single structure, ca. 1 mm long, stigma capitate, glabrous. Fruit syncarpous, sessile, 60-70 mm long, 40-50 mm in diameter, <b>ovoid, apex rounded, glabrous, smooth, not ribbed, green when ripe</b>; seeds not counted, 10-20 mm long, 10-15 mm in diameter, ellipsoid; aril absent. Distribution. A widespread species, but with few overall specimens, from Liberia to Nigeria, and from Cameroon to Democratic Republic of Congo; in Cameroon in the South and South-West regions. Habitat. A rare species in Cameroon known from two specimens; in lowland primary and secondary forests. Altitude 0-860 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Least Concern (LC) (Cosiaux et al. 2019s). Uses in Cameroon. None reported. Notes. <i>Isolona dewevrei</i> resembles <i>I. thonneri</i> in leaf and fruit shape, but the former can be distinguished by its elliptic and shorter corolla lobes with hairy margins and its flowering pedicel sparsely covered with short hairs. It is, however, very hard to distinguish both species apart based on fruit or vegetative characters alone. Specimens examined. <b>South Region</b>: Ngongondje hill near Akonetye 2 30'S of Ebolowa, 2.5°N, 11.13°E, <i>28 August 1979</i>, <i>Koufani A.</i> 123 (P,YA). <b>South-West Region</b>: Piste Munkep-Gayama 40 km NNW Wum, 6.73°N, 9.95°E, <i>08 July 1975</i>, <i>Letouzey R.</i> 13984 (K,MO,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 139-141, DOI: 10.3897/phytokeys.207.61432
description: {"references": ["Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019s. Isolona dewevrei. The IUCN Red List of Threatened Species: e.T32737A132677388. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T32737A132677388.en"]}