Monanthotaxis couvreurii P. H. Hoekstra, PhytoKeys 69: 79 2016
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 couvreurii

description: Monanthotaxis couvreurii P.H.Hoekstra, PhytoKeys 69: 79, 2016 Fig. 51; Map 6I Type. Cameroon. Central Region; Ottotomo Forest Reserve, <i>Couvreur T.L.P. 762</i>, 24 Apr 2015: holotype: WAG[WAG.1576998, WAG.1576999, WAG.1577000]; isotypes: MPU[MPU1374962]; YA <i>n.v</i>. Description. Liana, up to 20 m tall, d.b.h. up to 4 cm. Indumentum of simple hairs; old leafless branches glabrous, young foliate branches densely pubescent with dense ascending reddish brown hairs 0.1-0.2 mm long. Leaves: petiole 3-5 mm long, ca. 1 mm in diameter, densely pubescent, slightly grooved, blade inserted on top of the petiole; blade 4.5-12 cm long, 1.5-4.5 cm wide, oblong to obovate, apex acuminate to acute, acumen ca. 1 cm long, base cuneate to rounded, papyraceous, below sparsely pubescent when young and old, above sparsely pubescent when young, glabrous when old, discolorous, whitish below; midrib sunken or flat, above glabrous when young and old, below pubescent when young and old; secondary veins 7 to 11 pairs, glabrous above; tertiary venation percurrent. Individuals bisexual; <b>inflorescences cauliflorous</b> or more rarely ramiflorous on old leafless branches, axillary. Flowers with 9 perianth parts in 3 whorls, 1 to 2(3) per inflorescence when on branches, up to 20 per inflorescence when on main trunk; pedicel 4-20 mm long, ca. 1 mm in diameter, sparsely pubescent; in fruit unknown; basal bract not seen, upper bract minute, ca. 0.5 mm, ca. 1 mm wide; sepals 3, valvate, basally fused, ca. 1 mm long, 1 mm wide, triangular, apex acute, base truncate, brown, densely pubescent outside, glabrous inside, margins flat; petals free, subequal, <b>inner petals partly covered in bud</b>; outer petals 3, 3.5-5 mm long, 2-3.5 mm wide, elliptic to ovate, apex obtuse, base truncate, light yellow to white, margins flat, densely pubescent outside, sparsely pubescent inside; inner petals 3, valvate, 3-4.5 mm long, 1.2-1.5 mm wide, elliptic to ovate, apex acute, base truncate, light yellow to white, margins flat, pubescent outside, glabrous inside; <b>stamens 13 to 15, in 1 row, basally fused between each them</b>, ca. 1 mm long, linear; connective truncate to rounded, pubescent, cream; staminodes absent; carpels free, 9 to 12, ovary ca. 1 mm long, stigma globose, glabrous. Fruits unknown. Distribution. endemic to Cameroon; known from the Central Region. Habitat. A rare species, in lowland old secondary rain forests. Attitude around 700 m a.s.l. Local and common names known in Cameroon. None recorded. Preliminary IUCN conservation status. Critically Endangered (CR) (Hoekstra et al. 2021). Uses in Cameroon. None recorded. Notes. <i>Monanthotaxis couvreurii</i> is distinguished by its mainly cauliflorous flowers (but may also be ramiflorous) and its stamens in one row that are basally fused, a unique feature in <i>Monanthotaxis</i> (Hoekstra et al. 2016). This species is only known from the Ottotomo Forest reserve, near Yaoundé. Specimens examined. <b>Central Region</b>: Ottotomo Forest Reserve 45 km South of Yaoundé ca 5 km on main path into reserve, 3.65°N, 11.28°E, <i>24 April 2015</i>, <i>Couvreur T.L.P.</i> 762 (WAG,YA); Reserve Forestière d’Ottotomo 40 km de Yaoundé sur la route de Kribi, 3.64°N, 11.27°E, <i>05 May 1970</i>, <i>Farron C.</i> 7266 (P); Reserve forestière d’Ottotomo Yaoundé à environ 40 km au SW sur la route de Makak, 3.64°N, 11.27°E, <i>26 May 1970</i>, <i>Farron C.</i> 7359 (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 182-184, 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, Wieringa, JJ, Chatrou, LW, 2016. A nonet of novel species of Monanthotaxis (Annonaceae) from around Africa. PhytoKeys 69: 71 - 103, DOI: https://doi.org/10.3897/phytokeys.69.9292"]}