Monanthotaxis dielsiana P. H. Hoekstra, Taxon 66: 14 2017
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 dielsiana

description: Monanthotaxis dielsiana (Engl.) P.H.Hoekstra, Taxon 66: 14, 2017 Map 7B ≡ Unona dielsiana Engl., Bot. Jahrb. Syst. 39(3-4): 476, 1907. Oxymitra dielsiana (Engl.) Sprague &amp; Hutch.Bull. Misc. Inform. Kew 6: 156, 1916; Richella dielsiana (Engl.) R.E.Fr., in Engler &amp; Prantl Nat. Pflanzenfam., ed. 2, 17a (2): 139, 1959; Friesodielsia dielsiana (Engl.) Steenis, Blumea 12: 359, 1964. Type. Cameroon. South Region; Bipindi, <i>Zenker G.A. 2473</i>, Dec 1901: lectotype, chosen by Hoekstra et al. (2021), p. 147: B[B100154098]; isolectotypes: B[B100154096, B100154097, B100154099]; BM[BM001125043]; BR[BR000008801388]; COI[COI00071518]; E; G[G00308364]; GOET[GOET005688, GOET005689]; HBG[HBG502481]; K[K000198948]; KFTA[KFTA 0001554, KFTA 0001555]; L[L 0182291]; M[M-0240178]; P[P00363342, P00363343, P01988326]; S[S07-13404]; WAG[WAG0057970]; WU[WU 0025876]. Description. Liana, height unknown, d.b.h. unknown. Indumentum of simple hairs; old leafless branches glabrescent, <b>young foliate branches densely pubescent with orange-brown hairs ca. 0.5 mm long</b>. Leaves: petiole 6-11 mm long, ca. 2 mm in diameter, densely pubescent, grooved, blade inserted on top of the petiole; blade 10.5-21.5 cm long, 3.5-4 cm wide, narrowly oblong to oblanceolate, apex acuminate, acumen 0.5-2.5 cm long, base subcordate, subcoriaceous to membranous, below glabrous when young and old, above glabrous when young and old, discolorous, whitish below; midrib impressed, above sparsely pubescent when young and old, below sparsely pubescent when young and old; secondary veins 7 to 14 pairs, glabrous above; tertiary venation percurrent. Individuals bisexual; inflorescences ramiflorous on old leafless branches, leaf opposed. Flowers with 9 perianth parts in 3 whorls, 1 to 3 per inflorescence, pedicel 15-27 mm long, 1-2 mm in diameter, pubescent; in fruit 15-30 mm long, ca. 3 mm in diameter, pubescent; basal bract ca. 4 mm long, ca. 4 mm wide; upper bract ca. 5 mm long, ca. 4 mm wide; sepals 3, valvate, free, ca. 4 mm long, ca. 4 mm wide, triangular, apex acute, base truncate, densely pubescent outside, glabrous inside, margins flat; petals free, outer petals longer than inner, inner petals entirely covered in bud; outer petals 3, 10-15 mm long, 8-9 mm wide, ovate, apex obtuse, base truncate, margins flat, densely pubescent outside, glabrous inside; inner petals 3, valvate, ca. 8 mm long, ca. 8 mm wide, broadly ovate, apex obtuse, base truncate, margins flat, pubescent outside, glabrous inside; <b>stamens ca. 65, in 3 rows</b>, ca. 0.5 mm long, cylindrical; connective rounded, glabrous; staminodes absent; carpels free, ca. 41, ovary ca. 2 mm long, stigma globose, glabrous. Monocarps stipitate, stipes ca. 3 mm long, ca. 2 mm in diameter; monocarps ca. 6, ca. 45 mm long, 10-12 mm in diameter, moniliform, ellipsoid to cylindrical, apex rounded, densely pubescent, rugulose, constricted around seeds when more than 1, brown when unripe; seeds 1 to 2 per monocarp, ca. 15 mm long, ca. 9 mm in diameter, subcylindrical; aril absent. Distribution. endemic to Cameroon; known from the Central and South regions. Habitat. A rare species, known from two collections; in primary rain forests. Altitude 0-200 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 dielsiana</i> is distinguished by its dense yellow to orange-brown appressed pubescence on the young foliate branches, and flowers with around 65 stamens. It resembles <i>M. enghiana</i> and <i>M. glaucifolia</i> by the overall morphology of the flowers and leaves, but <i>M. enghiana</i> has longer erect hairs and <i>M. glaucifolia</i> has denser light-brown appressed hairs; in addition, <i>M. enghiana</i> and <i>M. glaucifolia</i> have many more stamens (more than 90). Specimens examined. <b>Central Region</b>: 60 km SW of Eséka S of Nyong R 12 km W of Songbong, 3.47°N, 10.5°E, <i>10 March 1965</i>, <i>Leeuwenberg A.J.M.</i> 5088 (BR,K,MO,P,WAG,YA). <b>South Region</b>: Bipindi, 3.08°N, 10.41°E, <i>01 January 1902</i>, <i>Zenker G.A.</i> 2473 (L,P,WAG).
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 188-191, 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"]}