Hexalobus A. DC., Mem. Soc. Phys. Geneve 5: 212 1832
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

description: Hexalobus A. DC., Mém. Soc. Phys. Genève 5: 212, 1832 Type species. <i>Hexalobus monopetalus</i> (A. Rich.) Engl. &amp; Diels. Description. Trees, 10-40 m tall, d.b.h. 35-100 cm; stilt roots or buttresses absent, but trunk strongly fluted. Indumentum of simple hairs. Leaves: petiole 1-8 mm long, 1-4 mm in diameter; blade 3.6-36 cm long, 1.2-10 cm wide, elliptic or obovate or ovate, apex acuminate or rounded to obtuse, base cuneate or cordate, concolorous; midrib sunken or flat; secondary veins 5 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 3 per inflorescence; pedicel (0)1-15 mm long, 1-5 mm in diameter; in fruit 2-30 mm long, 1-5 mm in diameter; bracts 5 to 6, several basal and two (sometimes fused) on upper half of pedicel; sepals 3, valvate, free, 4-21 mm long, 3-14 mm wide, ovate, apex acute, base truncate; petals 6, in a single whorl and basally fused, tube 2-10 mm long, inner and outer whorl not differentiated, equal or subequal; lobes 9-80 mm long, 3-21 mm wide, margins plicate (folded in bud) or wavy; stamens numerous, in 10 to 13 rows, 1-8 mm long, elongated; connective discoid or elongated; staminodes absent; carpels free, 2 to 16, ovary 2-5 mm long, stigma bilobed or divided into two lobes with margins coiled inwards. Fruit apocarpous, monocarps stipitate or sessile, stipes 0-3 mm long; monocarps 1 to 8, 22-95 mm long, 13-65 mm in diameter, ellipsoid to cylindrical, apex rounded, smooth or rugose or warty, pubescent, orange-brown to medium brown when ripe; seeds 2 to 36, 10-40 mm long, 7-20 mm in diameter, flattened ellipsoid; aril absent. A genus of five species, distributed across Africa. Four species are known from Cameroon, one endemic. This genus of trees is characterized by thin plicate (folded) petals, a unique character for Annonaceae (Botermans et al. 2011). In addition, the petals are fused at the base and form a short tube with 6 lobes, a character otherwise only seen in <i>Isolona</i>. The trunk of adult trees is strongly fluted, a character also seen in the larger species of the genus <i>Isolona</i> (e.g. <i>I. hexaloba</i>). Taxonomy. Botermans et al. (2011).
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 page 118, 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"]}