Isolona pilosa Diels, Bot. Jahrb. Syst. 41: 328 1908
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 pilosa

description: Isolona pilosa Diels, Bot. Jahrb. Syst. 41: 328, 1908 Fig. 39; Map 5E = Isolona theobromina Exell, J. Bot. 64 (Suppl. 1): 10, 1926. Type. Angola. Cabinda, Pango Munga, <i>Gossweiler J. 6112</i>, 7 Jan 1916: holotype: BM[BM000889332]; isotypes: COI[COI00077211]; LISJC <i>n.v.</i>; LISC[LISC000094, LISC000095, LISC000096]. Type. Democratic Republic of the Congo. Kasai Oriental; Lualaba, <i>Ledermann C. 11</i>, Mar 1906: holotype: B[B 10 0154216]; isotype: K <i>n.v</i>. Description. Tree, 13 m tall, d.b.h. up to 50 cm; stilt roots or buttresses absent, trunk not fluted. Indumentum of simple hairs; <b>old leafless branches glabrous, young foliate branches densely pubescent.</b> Leaves: petiole 3-12 mm long, 3-4 mm in diameter, <b>densely pubescent, grooved, blade inserted on the side of the petiole</b>; blade 19-27 cm long, 6-10 cm wide, obovate, apex acuminate, acumen 1-2 cm long, base rounded to cordate, papyraceous, below densely pubescent when young, densely pubescent when old, above sparsely pubescent to glabrous when young, sparsely pubescent to glabrous when old, concolorous; midrib raised above, above sparsely pubescent when young, sparsely pubescent when old, <b>below densely pubescent when young, densely pubescent when old</b>; secondary veins 15 to 20 pairs, glabrous below; tertiary venation reticulate. Individuals bisexual; inflorescences ramiflorous on old branches, axillary. Flowers with 9 perianth parts in 2 whorls, 1 to 2 per inflorescence; pedicel 2-4 mm long, 1-2 mm in diameter, <b>densely pubescent</b>; in fruit 2-8 mm long, 2-3 mm in diameter, pubescent; bracts 2 to 4, all basal, 2-4 mm long, 1-2 mm wide; sepals 3, valvate, free, 2-5 mm long, 2-4 mm wide, ovate, apex acuminate, base truncate, <b>densely pubescent outside</b>, glabrous inside, margins flat; petals basally fused, tube 5-10 mm long, inner and outer whorl not differentiated, equal; lobes 8-13 mm long, 3-5 mm wide, elliptic, apex acute, yellow, margins flat, <b>densely pubescent outside, pubescent with base glabrous inside</b>, curving inwards over the receptacle; stamens numerous, in 3 to 4 rows, 2 mm long, broad; connective discoid, glabrous; staminodes absent; carpels fused into a single structure, 2 mm long, stigma bilobed, glabrous. Fruit syncarpous, sessile, 30-60 mm long, 20-40 mm in diameter, ellipsoid, apex cuspidate, sparsely pubescent, <b>longitudinally ribbed</b>, color unknown; seeds not counted, 13-15 mm long, 6-8 mm in diameter, flattened ellipsoid; aril absent. Distribution. A central African species with a disjunct distribution, from Cameroon to Gabon and the Republic of Congo, also present in the Democratic Republic of Congo; in Cameroon known from the extreme East region. Habitat. A rare species in Cameroon; in lowland rain forests or swampy areas. Altitude 100-450 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Vulnerable B2ab(iii) (Cosiaux et al. 2019u). Uses in Cameroon. None reported. Notes. <i>Isolona pilosa</i> is the most pubescent species of the genus. It is distinguishable by its densely pubescent leaf midrib on the upper side (even in older leaves), as well as its short and densely hairy flowering pedicels. The corolla lobes are densely hairy on the outside and near the margins on the inside; the inner part of the tube is glabrous, which distinguishes it from <i>I. congolona</i> which is pubescent on the inner surface of the tube but glabrous on the outside. Several specimens collected by Harris DJ are reported from The Lobéké National Park in East Cameroon, but we were not able to see them and verify their identification (e.g. <i>6408, 6538, 6627</i>). Specimens examined. <b>East Region</b>: Region near Station Molundu Dscha (Ngoko) Nginda 21 km north Molundu, 2.2°N, 15.2°E, <i>07 January 1911</i>, <i>Mildbraed G.W.J.</i> 4193 (HBG).
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 145-147, DOI: 10.3897/phytokeys.207.61432
description: {"references": ["Le Thomas, A, 1969b. Annonacees. In: Aubreville, A, Ed., Flore du Gabon. Museum National d'Histoire Naturelle, Paris: 1 - 371", "Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019u. Isolona pilosa. The IUCN Red List of Threatened Species: e.T65604009A132678057. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T65604009A132678057.en"]}