Monanthotaxis bicornis Verdc., Kew Bull. 25 (1): 31 1971
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 bicornis

description: Monanthotaxis bicornis (Boutique) Verdc., Kew Bull. 25(1): 31, 1971 Map 6D ≡ Popowia bicornis Boutique, Bull. Jard. Bot. État Bruxelles 21: 115. Type. Democratic Republic of the Congo. Orientale; Yamboa, <i>Louis J.L.P. 8957</i>, 21 Apr 1938: lectotype, chosen by Hoekstra et al. (2021), p. 129: BR[BR0000008805386]; isolectotypes: BR[BR6102005255172, BR0000008805379]; K[K000913657]; P[P00362792]. Description. Liana, 30 m tall, d.b.h. unknown. Indumentum of simple hairs; old leafless branches glabrescent with lenticels, <b>young foliate branches yellow-brown, with dense appressed yellow-brown hairs 0.2-0.4 mm long.</b> Leaves: petiole 3-5 mm long, 0.6-1 mm in diameter, densely pubescent, cylindrical, blade inserted on the side of the petiole; blade 6-12 cm long, 1.9-3.5 cm wide, oblong to elliptic, apex acuminate, acumen 0.5-1.5 cm long, base cuneate, papyraceous, below densely pubescent when young, densely pubescent to sparsely pubescent when old, above glabrous when young and old, discolorous, whitish below; midrib impressed, above sparsely pubescent to glabrous when young and old, below densely pubescent when young and old; secondary veins 11 to 14 pairs, glabrous above; tertiary venation percurrent. Individuals bisexual; inflorescences ramiflorous on young foliate branches, axillary. Flowers with 9 perianth parts in 3 whorls, 1 to 3 per inflorescence; pedicel 15-60 mm long, 0.3-0.6 mm in diameter, sparsely pubescent to densely pubescent; basal bract ca. 1 mm long, ca. 0.5 mm wide; upper bract 0.5-1 mm long, 0.5-1 mm wide; sepals 3, valvate, free, ca. 1 mm long, 2-3 mm wide, ovate, apex acute, base truncate, densely pubescent outside, densely pubescent inside, margins flat; petals free, outer petals longer than inner; inner petals entirely covered in bud; outer petals 3, 4-6.7 mm long, 4.6-6 mm wide, ovate, apex obtuse, base truncate, yellow to white, margins flat, densely pubescent outside, pubescent with a glabrous base inside; inner petals 3, valvate, 2.5-2.8 mm long, 2.2-3 mm wide, rhombic, apex obtuse, base truncate, yellow to white, margins flat, pubescent outside, pubescent, base glabrous inside; <b>stamens 15 to 17, in 1 row, ca. 1 mm long, oblong</b>; connective truncate, glabrous, thecae <b>converging apically</b>; staminodes absent; carpels free, 6 to 9, ovary ca. 1 mm long, stigma deeply bilobed, glabrous. Fruits unknown. Distribution. A central African species, known from Cameroon and the Democratic Republic of the Congo; in Cameroon known from the South region. Habitat. A rare species only known by two collections in Cameroon, in swamp and secondary rain forests. Altitude: 100-650 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 recorded. Notes. <i>Monanthotaxis bicornis</i> is distinguished by the branches and petioles with appressed yellow-brown hairs, the cuneate leaf base, 15 to 17 stamens in one whorl and the thecae (pollen sacs) converging apically. Converging thecae are also found in <i>M. pellegrinii</i> but this latter species has ascending reddish brown hairs. Specimens examined. <b>South Region</b>: Route minière E of Mt Elephant ca 20 km SE of Kribi, 2.78°N, 10.01°E, <i>07 April 1970</i>, <i>Bos J.J.</i> 6735 (BR,K,LM,MO,P,WAG,YA); Oveng (Sangmelima), 3.09°N, 11.90°E, <i>22 March 1962</i>, <i>Breteler F.J.</i> 2692 (B,BR,K,MO,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 171-172, 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"]}