Monanthotaxis hexamera P. H. Hoekstra, Blumea 66 (1): 163 2021
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 hexamera

description: Monanthotaxis hexamera P.H.Hoekstra, Blumea 66 (1): 163, 2021 Fig. 60; Map 8A Type. Cameroon. South Region; près de zingui, <i>Letouzey R.G. 10288</i>, 5 Apr 1970: holotype: P[P01960096]; isotype: YA[YA0002998]. Description. Liana, up to 3 m tall, d.b.h. unknown. Indumentum of simple hairs; old leafless branches glabrescent, <b>young foliate branches pubescent with dense appressed to ascending yellowish-white hairs 0.1-0.2 mm long</b>. Leaves: petiole 3-5 mm long, ca. 1 mm in diameter, densely pubescent, slightly grooved, blade inserted on top of the petiole; blade 9.5-11.5 cm long, 3.3-4.1 cm wide, oblong to elliptic, apex acute, acumen 0.5-1 cm long, base rounded to subcordate, papyraceous, <b>below sparsely pubescent with yellowish-white hairs when young and old</b>, above glabrous when young and old, discolorous, whitish below; midrib impressed, above glabrous when young and old, below pubescent when young, sparsely pubescent when old; secondary veins 11 to 13 pairs, glabrous above; tertiary venation percurrent. Individuals bisexual; inflorescences ramiflorous on old leafless branches, leaf opposed to axillary. Flowers with 9 perianth parts in 3 whorls, 1 to 4 per inflorescence; pedicel 15-24 mm long, ca. 0.5 mm in diameter, sparsely pubescent; in fruit unknown; bracts 2, one basal and one upper towards the lower half of pedicel, basal bract ca. 1 mm long, ca. 0.5 mm wide; upper bract ca. 1 mm long, ca. 0.5-1 mm wide; sepals 3, valvate, basally fused, ca. 1 mm long, ca. 1 mm wide, ovate, apex acute, base truncate, sparsely pubescent outside, glabrous inside, margins flat; petals free, outer petals longer than inner, inner petals entirely covered in bud; outer petals 3, 4.5-8 mm long, 3.7-5.8 mm wide, ovate, apex rounded to obtuse, base truncate, white, margins flat, sparsely pubescent outside, pubescent, base glabrous inside; inner petals 3, valvate, ca. 5.1 mm long, 2.7-2.9 mm wide, elliptic, apex obtuse and shortly acuminate, base truncate, margins flat, densely pubescent outside, pubescent with a glabrous base inside; stamens 6, in 1 row, ca. 2 mm long, linear; connective truncate, pubescent, <b>filament ca. 2 mm long</b>; staminodes absent; carpels free, 6, ovary ca. 2 mm long, stigma globose, glabrous. Fruits unknown. Distribution. endemic to Cameroon; known only from the type locality in the South region. Habitat. In bushy scrub. Altitude ca. 450 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 reported. Notes. <i>Monanthotaxis hexamera</i> can be distinguished from the other Cameroonian species by the yellowish-white hairs on the branches and leaf underside. Furthermore, the stamens have very long filaments (ca. 2 mm long versus less than 0.5 mm long in other species), a characteristic only shared with <i>Monanthotaxis filamentosa</i>, which has a very different indumentum consisting of long erect reddish-brown hairs.
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 209-212, 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"]}