Hexalobus bussei Diels, Bot. Jahrb. Syst. 39: 479 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
Hexalobus
Hexalobus bussei

description: Hexalobus bussei Diels, Bot. Jahrb. Syst. 39: 479, 1907 Fig. 30; Map 4E = Hexalobus megalophyllus Engl. &amp; Diels, Bot. Jahrb. Syst. 39: 479, 1907. Type. Cameroon. South Region, Bipindi, Zenker G.A. 2889, 1904: holotype: B[B100154197]; isotypes: BR[BR0000015306210]; COI[COI00033178]; F; G[G00011590]; HBG[HBG518920]; K[K000198935]; L[L-0049297]; M[M0089222]; MO[MO-2246481]; P[P00315838]; S[S12-22791]; US[00098767]; WAG[WAG0053629]; WRSL; WU[WU 0025867]; Z[Z-000000827]. Type. Cameroon. South Region; Kribi, <i>Busse W.C.O. 3216</i>, 1904: holotype: B[B 10 0154198]. Description. <b>Tree, 20-30 m tall</b>, d.b.h. unknown; stilt roots or buttresses absent, <b>trunk slender, not fluted</b>. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches pubescent. Leaves: petiole 1-7 mm long, 3-4 mm in diameter, pubescent, grooved, blade inserted on the side of the petiole; <b>blade 15.5-36 cm long, 5.5-10 cm wide</b>, obovate, apex acuminate, acumen 0.5-1 cm long, base cordate, coriaceous, below glabrous when young and old, above sparsely pubescent to glabrous when young, sparsely pubescent to glabrous when old, concolorous; midrib sunken or flat, above pubescent when young and old, below pubescent when young and old; secondary veins 12 to 17 pairs; 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 2 per inflorescence; pedicel 10-12 mm long, 4-5 mm in diameter, densely pubescent; in fruit 10-13 mm long, 2-3 mm in diameter, glabrous; bracts 5 to 6, several basal and two (sometimes fused) towards the upper half of pedicel, basal bracts 3-9 mm long, 2-5 mm wide; upper bracts 6-13 mm long, 2-3 mm wide; sepals 3, valvate, free, 16-20 mm long, 11-14 mm wide, ovate, apex acute, base truncate, brown, densely pubescent outside, glabrous inside, margins flat; petals basally fused, tube 2-5 mm long, purple, inner and outer whorl not differentiated, equal, lobes 23-40 mm long, 8-10 mm wide, elliptic, apex rounded, pale yellow, margins wavy, densely pubescent outside, densely pubescent inside, plicate; stamens numerous, 7-8 mm long, elongated; connective elongated, glabrous; staminodes absent; carpels free, 3 to 7, ovary 4-5 mm long, stigma elongate, pubescent. Monocarps stipitate, ca. 1 mm long, ca. 3 mm in diameter; monocarps 2 to 4, 53-78 mm long, ca. 40 mm in diameter, ellipsoid, apex rounded, sparsely pubescent, <b>rugose, irregularly ribbed in reticulate pattern, orange when ripe</b>; seeds 17 to 19 per monocarp, 23-28 mm long, 17-19 mm in diameter, flattened ellipsoid; aril absent. Distribution. endemic to Cameroon; known from the South region. Habitat. A rare species, in primary lowland rain forests, sometimes riverine. Altitude 0-200 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Endangered (EN) (Cosiaux et al. 2019l). Uses in Cameroon. None recorded. Notes. <i>Hexalobus bussei</i> is distinguished by its large leaf blades (15-36 cm long) and the irregularly ridged and strongly rugose surface of its monocarps. Specimens examined. <b>South Region</b>: S bank of Kienke river just E of Kribi, 3.1°N, 10.25°E, <i>12 May 1969</i>, <i>Bos J.J.</i> 4495 (P,WAG); 21 km from Kribi high forest exploitation N of Lolodorf road, 3.03°N, 10.05°E, <i>07 August 1969</i>, <i>Bos J.J.</i> 5157 (BR,P,WAG,YA); ca 16 km from Kribi Lolodorf road, 3°N, 10.01°E, <i>19 September 1969</i>, <i>Bos J.J.</i> 5370 (BR,C,K,LD,LM,MO,P,WAG,YA); Kribi, 2.95°N, 9.916°E, <i>01 September 1904</i>, <i>Busse W.C.O.</i> 3216 (B); 31 km ESE Kribi N of Kienke River Nyabessan, 2.9°N, 10.16°E, <i>19 April 1968</i>, <i>Letouzey R.</i> 9387 (P,YA); Bipindi, 3.08°N, 10.42°E, <i>01 January 1904</i>, <i>Zenker G.A.</i> 2889 (B,BR,COI,F,G,L,M,MO,P,S,WAG); Bipindi, 3.08°N, 10.42°E, <i>26 October 1908</i>, <i>Zenker G.A.</i> 3550 (BR,COI,G,M,MO,P,S); Bipindi, 3.08°N, 10.41°E, <i>01 January 1908</i>, <i>Zenker G.A.</i> 3592 (G,K); Bipindi, 3.08°N, 10.41°E, <i>01 January 1909</i>, <i>Zenker G.A.</i> 3889 (BR,COI,G,K,L,M,MO,P,S); Bipindi, 3.08°N, 10.42°E, <i>01 January 1913</i>, <i>Zenker G.A.</i> 4831 (BR,G,P,S).
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 119-121, DOI: 10.3897/phytokeys.207.61432
description: {"references": ["Botermans, M, Sosef, MSM, Chatrou, LW, Couvreur, TLP, 2011. A revision of the African genus Hexalobus (Annonaceae). Systematic Botany 36: 33 - 48, DOI: https://doi.org/10.1600/036364411X553108", "Cosiaux, A, Couvreur, TLP, Erkens, RHJ, 2019l. Hexalobus bussei. The IUCN Red List of Threatened Species: e.T132520196A132520522. https://doi.org/10.2305/IUCN.UK.2019-3.RLTS.T132520196A132520522.en"]}