Isolona congolana Engl. &amp; Diels, Monogr. Afrik. Pflanzen. - Fam. 6: 84 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 congolana

description: Isolona congolana (De Wild. &amp; T. Durand) Engl. &amp; Diels, Monogr. Afrik. Pflanzen.-Fam. 6: 84, 1901 Figs 33, 34; Map 5A ≡ Monodora congolana De Wild. &amp; T. Durand, Bull. Soc. Roy. Bot. Belgique 38: 13, 1899. = Isolona maitlandii Keay, Kew Bull. 7(2): 155, 1952. Type. Cameroon. North-West Province, Ngong, Maitland T.D. 1555, Jun 1931: holotype: K[K000105576]; isotypes: BM, FHO. Type. Democratic Republic of the Congo. Equateur; Lukandu, <i>Dewèvre A.P. 1103, 19 Nov</i> 1896: lectotype, sheet here designated: BR[BR0000006248932]; isotypes: BR[BR0000006248857, BR0000006249588, BR0000006249250]. Description. Tree, 10-30 m tall, d.b.h. 5-45 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches densely pubescent. Leaves: petiole 4-7 mm long, 2-3 mm in diameter, densely pubescent, grooved, blade inserted on top of the petiole; blade 13-19 cm long, 4-5 cm wide, <b>narrowly ovate to narrowly elliptic or oblong</b>, apex acuminate, acumen 0.5-1 cm long, base cuneate to rounded, subcoriaceous, below sparsely pubescent when young, glabrous when old, above sparsely pubescent when young, glabrous when old, concolorous; midrib raised, above sparsely pubescent when young, glabrous when old, below sparsely pubescent when young, glabrous when old; secondary veins 11 to 14 pairs, sparsely pubescent to glabrous below; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on old leafless or young foliate branches, axillary. Flowers with 9 perianth parts in 2 whorls, 1 to 3 per inflorescence; pedicel 10-23 mm long, 1 mm in diameter, sparsely pubescent to glabrous; in fruit 2-5 mm long, 2-3 mm in diameter, glabrous; bracts 3 to 4, several basal and one upper towards the lower half of pedicel, basal bracts 1 mm long, 1 mm wide; upper bracts 1 mm long, 1 mm wide; sepals 3, valvate, free, 3 mm long, 2 mm wide, ovate, apex acute, base truncate, green, pubescent outside, glabrous inside, margins flat; petals basally fused, tube 4-10 mm long, inner and outer whorl not differentiated, equal; lobes 9-20 mm long, 3-7 mm wide, elliptic to ovate, apex rounded, green turning red, margins wavy, <b>glabrous outside, densely pubescent inside</b>, spreading horizontally; stamens numerous, in 3 to 4 rows, 2 mm long, broad; connective discoid, densely pubescent, cream; staminodes absent; carpels fused into a single structure, 2 mm long, stigma bilobed, slightly capitate, densely pubescent. Fruit syncarpous, sessile, 60-80 mm long, 40-50 mm in diameter, ellipsoid, apex rounded, glabrous, smooth to verrucose, irregularly ribbed, green when ripe; seeds not counted, 15-25 mm long, 10-15 mm in diameter, ellipsoid; aril absent. Distribution. A central African species, with a disjunct distribution between the Cameroon Volcanic Line in Cameroon, and Eastern Democratic Republic of Congo, one collection from Central African Republic; in Cameroon known from the Littoral, North-West and South-West regions. Habitat. A common species when present, mainly in montane or premontane rain forests, along rivers and bush land. Altitude 800-1700 m a.s.l. Local and common names known in Cameroon. Ndin (<i>Westphal 10012</i>). IUCN conservation status. Least Concern (LC) (Cosiaux et al. 2019q). Uses in Cameroon. <i>food</i>: fruit for condiments, spices, flavourings (<i>Westphal 10012</i>). Notes. This the only species of <i>Isolona</i> growing above 1000 m in Cameroon. <i>Isolona congolana</i> is characterized by the densely pubescent inner part of the corolla tube and a glabrous outer part of the tube, a unique feature in this genus (<i>I. pilosa</i> is pubescent on both sides of the corolla). The leaves are also characteristic being narrowly ovate to narrowly elliptic or oblong, giving a unique aspect to the foliage. Specimens examined. <b>Littoral Region</b>: Manengouba Mt 4 km WNW Of Nkongsamba, 4.98°N, 9.900°E, <i>04 April 1972</i>, <i>Leeuwenberg A.J.M.</i> 9550 (B,BR,C,GC,H,K,LD,M,MO,P,WAG,YA). <b>North-West Region</b>: Kagwene, 6.12°N, 9.734°E, <i>20 May 2009</i>, <i>Ashworth J.</i> 196 (K,YA); Bamenda Distr Ngong, 6.58°N, 10.43°E, <i>01 June 1931</i>, <i>Maitland T.D.</i> 1555 (BM,K); Bamenda Wae, 6°N, 10.41°E, <i>01 April 1931</i>, <i>Maitland T.D.</i> 1596 (K). <b>South-West Region</b>: Nyasoso, 4.86°N, 9.7°E, <i>04 June 1996</i>, <i>Cable S.</i> 2843 (K,MO,WAG,YA); 2 km north of Nyasoso towards Mpako, 4.84°N, 9.679°E, <i>04 April 2016</i>, <i>Couvreur T.L.P.</i> 1054 (WAG,YA); Nyasoso, 4.83°N, 9.683°E, <i>19 March 1996</i>, <i>Etuge M.</i> 1794 (K,WAG); White trail (above Kupe village) towards Madam 4.78°N, 9.716°E, <i>28 May 1996</i>, <i>Etuge M.</i> 2000 (BR,K,MO,P,WAG,YA); Lake Edip, 4.95°N, 9.65°E, <i>21 November 1998</i>, <i>Etuge M.</i> 4488 (K,WAG,YA); Etube Tape from Nyasoso, 4.83°N, 9.683°E, <i>06 February 1995</i>, <i>Lane P.</i> 532 (K,YA); Bu 4.15°N, 9.233°E, <i>6 June 1898</i>, <i>Lehmbach H.</i> 224 (B). <b>West Region</b>: Bali Ngemba Forest Reserve, 5.82°N, 10.08°E, <i>13 April 2004</i>, <i>Etuge M.</i> 5431 (K,WAG,YA); Along the road 6 km W of Dschang on road to Fongo Ndeng, 5.45°N, 9.95°E, <i>15 May 1978</i>, <i>Westphal E.</i> 10012 (P,WAG).
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 133-136, DOI: 10.3897/phytokeys.207.61432
description: {"references": ["Couvreur, TLP, 2009. Monograph of the syncarpous African genera Isolona and Monodora (Annonaceae). Systematic Botany Monographs 87: 1 - 150", "Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019q. Isolona congolana. The IUCN Red List of Threatened Species: e.T32736A132677351. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T32736A132677351.en"]}