Monodora zenkeri Engl., Notizbl. Koenigl. Bot. Gart. Berlin 2: 301 1899
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
Monodora
Monodora zenkeri

description: Monodora zenkeri Engl., Notizbl. Königl. Bot. Gart. Berlin 2: 301, 1899 Fig. 79; Map 10D Type. Cameroon. Central Region; Yaoundé, <i>Zenker G.A. 776</i>, 1896: holotype: B[B 10 015406]; isotypes: COI[COI00077202]; G[G00011721]; K[K000199027]; NY[NY00026141]; P[P00363263]. Description. Leaning tree [or liana?], to 6 m tall, d.b.h. up to 6 cm; stilt roots or buttresses absent. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches sparsely pubescent to glabrous. Leaves: petiole 2-4 mm long, 1 mm in diameter, glabrous, grooved, blade inserted on the side of the petiole; blade 10-15 cm long, 8-14 cm wide, elliptic to obovate, apex acuminate, acumen 3-6 cm long, base rounded to obtuse, coriaceous to papyraceous, below glabrous when young and old, above glabrous when young and old, concolorous; midrib raised above, above glabrous when young and old, below glabrous when young and old; secondary veins 10 to 13 pairs, glabrous below; tertiary venation intermediate. Individuals bisexual; inflorescences ramiflorous on young foliate branches, leaf opposed or extra axillary. Flowers bisexual with 9 perianth parts in 3 whorls, 1 per inflorescence; pedicel 28-50 mm long, 1 mm in diameter, sparsely pubescent; in fruit unknown; bracts 1, towards the upper half or middle of pedicel, 11-20 mm long, 10-13 mm wide; sepals 3, valvate, free, 2-5 mm long, 2-4 mm wide, ovate, apex acute, base truncate, green to brown-red, glabrous outside, glabrous inside, margins flat; petals basally fused, tube 4-7 mm long, inner and outer whorl differentiated, outer petals longer than inner; outer petals 3, 35-45 mm long, 20-28 mm wide, ovate, apex acute to obtuse, base truncate flanked by two small lobes, speckled and streaked yellow-purple, base creamy-white, <b>margins flat</b>, sparsely pubescent outside, sparsely pubescent to glabrous inside; inner petals 3, valvate, 9-13 mm long, 13-16 mm wide, triangular, apex acute, base narrowed into a claw, claw 4.0-7 mm long, pale green with red spots, margins flat, folded outwards, glabrous inside, pubescent outside; receptacle convex to flat; stamens numerous, in 9 to 10 rows, 1 mm long, broad; connective discoid, glabrous; staminodes absent; carpels fused into a single structure, 1 mm long, stigma bilobed, slightly capitate. Fruits unknown. Distribution. endemic to Cameroon; known from Central, East, South regions. Habitat. A rare species, not collected recently; in secondary and disturbed lowland rain forests. Altitude 600-700 m a.s.l. Local and common names known in Cameroon. None recorded. IUCN conservation status. Not evaluated (certainly threatened). Uses in Cameroon. None reported. Notes. <i>Monodora zenkeri</i> is easily distinguished by the presence of two small lobes at the base of the outer petals. Some labels indicate that it is a liana, probably a strongly leaning tree, mainly near large rocks. In this sense it resembles <i>M. crispata</i> in its lianescent habit. Specimens examined. <b>Central Region</b>: ca. 4 km NE of Otélé near the road to Yaoundé, 3.58°N, 11.25°E, <i>28 March 1964</i>, <i>de Wilde J.J.F.E</i> 2249 (BR,P,WAG,YA); Etwa 195 km NO Jaunde, 5.21°N, 12.9°E, <i>01 January 1914</i>, <i>Mildbraed G.W.J.</i> 8476 (K); Mt Ngoro à 38 km au N de Bafia (piedmont), 4.93°N, 11.38°E, <i>01 May 1978</i>, <i>Ngameni B.K.</i> 113 (P,YA); Yaoundé, 3.87°N, 11.52°E, <i>1896</i>, <i>Zenker G.A.</i> 776 (B,COI,G,K,P). <b>East Region</b>: Bertoua, 4.58°N, 13.73°E, <i>27 April 1961</i>, <i>Breteler F.J.</i> 1319 (WAG); 6 km along road south to Doumé, 4.38°N, 12.91°E, <i>10 April 1962</i>, <i>Breteler F.J.</i> 2747 (BR,K,P,WAG,YA); Deng Deng, 5.16°N, 13.58°E, <i>01 April 1914</i>, <i>Mildbraed G.W.J.</i> 8850 (K); Bertoua, 4.58°N, 13.68°E, <i>27 May 1955</i>, <i>Nana P.</i> 98 (P,YA). <b>South Region</b>: Nkoldjobe dans le massif du Mbam-Minkom 18 km Nord-Ouest de Yaoundé, 3.93°N, 11.35°E, <i>16 April 1984</i>, <i>Achoundong G.</i> 1056 (YA); Bitye river, 3.02°N, 12.37°E, <i>01 January 1920</i>, <i>Bates G.L.</i> 1244 (COI); Near village Oveng 27 km from Sangmélima along road to Yaoundé, 3.09°N, 11.90°E, <i>21 March 1962</i>, <i>Breteler F.J.</i> 2683 (BR,K,P,U,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 262-264, 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"]}