Monanthotaxis paniculata P. H. Hoekstra, Phytotaxa 186 (2): 106 2014
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
Monanthotaxis
Monanthotaxis paniculata

description: Monanthotaxis paniculata P.H.Hoekstra, Phytotaxa 186(2): 106, 2014 Figs 65, 66; Map 8G Type. Gabon. Ogooué-Ivindo; north of Koumameyong along SHM lumber roads, <i>McPherson G.D. 16123</i>, 31 Jan 1993: holotype: WAG[WAG0357246, WAG0357247]; isotypes: LBV <i>n.v.</i>, MO <i>n.v.</i>, P[P01967243]. Description. Liana, 20 m tall, d.b.h. unknown. Indumentum of simple hairs; old leafless branches glabrescent, young foliate branches densely pubescent with appressed reddish-brown hairs 0.5 mm long. Leaves: petiole 4-8 mm long, ca. 1 mm in diameter, densely pubescent, slightly grooved, blade inserted on top of the petiole; blade 8.5-23.5 cm long, 3.3-6.6 cm wide, ovate to oblanceolate, apex acuminate to acute, acumen 0.5-2.7 cm long, base cuneate to broadly cuneate with small linear black glands, chartaceous, <b>below densely pubescent with yellowish hairs when young</b>, sparsely pubescent to glabrous when old, above sparsely pubescent when young, glabrous when old, discolorous, whitish below; midrib impressed, above glabrous when young and old, below sparsely pubescent when young and old; secondary veins 10 to 16 pairs, glabrous above; tertiary venation percurrent. Individuals bisexual; inflorescences ramiflorous on old leafless branches, axillary or terminal. Flowers with 9 perianth parts in 2 whorls, <b>numerous per inflorescence, peduncle 5.5-27 cm long, panicle-like</b>; pedicel 5-27 mm long, 0.5-1 mm in diameter, densely pubescent with short reddish brown hairs; in fruit 20-30 mm long, 2-3 mm in diameter, pubescent; bracts 2, one basal and one upper towards the middle or lower half of pedicel, basal bract 1-8 mm long, ca. 1 mm wide; upper bract ca. 1 mm long, ca. 1 mm wide; sepals 3, valvate, free, 0.5-1 mm long, 1-1.5 mm wide, broadly ovate, apex obtuse, base truncate, densely pubescent outside, glabrous inside, margins flat; <b>petals free, petals 6 in one whorl</b>, ca. 3 mm long, ca 1.5 mm wide, ovate, apex rounded to obtuse, base truncate, margins flat, sparsely pubescent outside, sparsely pubescent inside; <b>stamens 6, in 1 row, inserted on a black hexagonal disc</b>, opposite to the petals, free at the base, ca. 1 mm long, obconic; <b>connective truncate, kidney-shaped in dorsal view</b>, glabrous; staminodes 6, alternating with the stamens, glabrous; carpels free, 14 to 24, ovary ca. 2 mm long, stigma shortly bilobed, acute, glabrous. Monocarps stipitate, stipes 3-4 mm long, 3-4 mm in diameter; monocarps 2 to10, 15-30 mm long, 10-15 mm in diameter, <b>not moniliform</b>, ellipsoid, apex rounded, pubescent, smooth, green when ripe; <b>seed 1 per monocarp</b>, ca. 10 mm long, ca. 8 mm in diameter, ellipsoid; aril absent. Distribution. A central African species from Gabon and Cameroon; in Cameroon known from Littoral and South regions. Habitat. A rare species in Cameroon; in lowland primary or old secondary rain forests. Altitude 300-350 m a.s.l. Local and common names known in Cameroon. None recorded. Preliminary IUCN conservation status. Endangered (EN) (Hoekstra et al. 2021). Uses in Cameroon. None reported. Notes. <i>Monanthotaxis paniculata</i> is distinguished by the long appressed yellowish pubescence on lower side of the leaf blade, its inflorescence in a large panicle-like rhipidium (unique in the genus) and its flowers with one whorl of 6 petals. It is morphologically close to <i>M. congoensis</i>, but differs by its panicle-like inflorescence, depressed-globose floral buds, stamens inserted on a black hexagonal disc, and connective appendage kidney-shaped in dorsal view. Fruits were unknown when the species was first published (Hoekstra et al. 2014) but have since been collected (<i>Couvreur 1108</i>) and fruits are described here for the first time. The presence of <i>Monanthotaxis paniculata</i> in Cameroon is only based on two sterile collections, and needs to be confirmed with fertile material. Specimens examined. <b>Littoral Region</b>: Mambe Massif above Boga village 100 km along road from Yaoundé to Ed 3.90°N, 10.77°E, <i>19 June 2014</i>, <i>Couvreur T.L.P.</i> 651 (WAG,YA). <b>South Region</b>: Campo Ma’an National Park 11 km on trail from Ebinanemeyong village on road 7 km from Nyabessan to Campo town, 2.47°N, 10.34°E, <i>14 February 2015</i>, <i>Couvreur T.L.P.</i> 708 (WAG,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 223-226, DOI: 10.3897/phytokeys.207.61432
description: {"references": ["Hoekstra, PH, Wieringa, JJ, Maas, JM, Chatrou, LW, 2021. Revision of the African species of Monanthotaxis (Annonaceae). Blumea 66: 107 - 221, DOI: https://doi.org/10.3767/blumea.2021.66.02.01", "Hoekstra, PH, Chatrou, LW, Wieringa, JJ, 2014. A new species of Monanthotaxis from Gabon with a unique inflorescence type for Annonaceae. Phytotaxa 186: 106 - 112, DOI: https://doi.org/10.11646/phytotaxa.186.2.5"]}