Myrianthus holstii

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Myrianthus holstii
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Rosales
Family: Urticaceae
Genus: Myrianthus
Species:
M. holstii
Binomial name
Myrianthus holstii
Engl.

Myrianthus holstii is a plant species within the family Urticaceae . It grows either as a shrub or tree. It is considered a dioecious species but a monoecious tree has been observed. [1]

Contents

Description

Species grows as a shrub or a tree, as a tree it can reach an height of 20 m. [2] It has a spreading crown and a short trunk, and the base of the tree has strong stilt roots; the bark is light brown and the slash is pinkish in color. Leaves are palmately compound with 3 - 8 leaflets, the upper surface is commonly glabrous while the veins on the lower surface is regularly covered in short minute hairs. [2] Petiole and stipule are present, the petiole can reach up to 35 cm long and the stipule is caducous and can reach about 4 cm long. [2] Leaflets can reach a length of 60 cm and width of about 32 cm, the outline is oblanceolate to oblong - elliptic and the margin tends to be subentire or serrate to dentate. [2]

Fuit is cone like with a hard outer surface, orange to yellow when ripe.

Distribution and habitat

Occurs in Central and East Africa, from the democratic Republic of Congo and Tanzania southwards to Tanzania. Found in moist montane forest environments or near rivers. [2]

Ecology

The African bush elephant, eastern gorillas and chimpanzees have been observed to eat the fruits of Myrianthus holstii and also strip the stems for foliage. [1]

Uses

In ethnomedicine, a decoction of bark extracts of the species is used in the treatment of malaria and also as an anti cough medicine, while leaves are used as a galactogogue and also in the treatment of a variety of ailments including hearth issues and pregnancy complications. [3]

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Branches dull brown or blackish, cylindric, pubescent or glabrous. Petiole 1·5–6·5 cm. long, almost cylindric, narrowly canaliculate and marginate above, pubescent or glabrous. Leaflets ± dull red-brown, ovate or ovate-lanceolate, acuminate, entire and ± undulate at the margin, membranous to ± rigid or subcoriaceous, glabrous or ± pubescent on the margin, midrib and nerves; median leaflet (3)6–13(16) × (1·2)2·5–4(7) cm., cuneate and frequently petiolulate at the base, the lateral ones (2)2·5–7(12) × (0·8)1·3–3·5(5·5) cm., asymmetric and slightly cuneate or somewhat rounded at the base, very shortly petiolulate to sessile; midrib slightly raised in the upper surface, very prominent below; lateral nerves arcuate, slender, raised on both sides, reticulation lax, almost invisible or sometimes conspicuous. Panicles terminal and axillary, ample, pyramidal, much branched, multiflorous, the terminal ones longer than the leaves, the axillary ones as long as the latter or somewhat longer; pedicels 1–2·5 mm. long. Male flowers: calyx-segments 0·5 mm. long, ovate, obtuse, glabrous; petals c. 1·5 mm. long, elliptic, obtuse; filaments c. 1 mm. long. Female flowers: ovary ovoid; styles reflexed; disk cupuliform, 5-lobulate; staminodes present. Drupe pinkish-yellow to reddish-brown, shining, (4)5(6) mm. in diam., globose, glabrous.

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References

  1. 1 2 Kissa, David Ocama; Ssali, Fredrick; Sheil, Douglas (2023). "Sex ratios, damage and distribution of Myrianthus holstii Engl.: a dioecious afromontane forest tree". Journal of Tropical Ecology. 39. doi: 10.1017/S0266467422000499 . ISSN   0266-4674.
  2. 1 2 3 4 5 de Ruiter, G. (1976-12-31). "Revision of the Genera Myrianthus and Musanga (Moraceae)". Bulletin du Jardin botanique national de Belgique / Bulletin van de National Plantentuin van België. 46 (3/4): 471–510. doi:10.2307/3667730. JSTOR   3667730.
  3. Bussmann, Rainer W.; Paniagua-Zambrana, Narel Y.; Njoroge, Grace N. (2021), Bussmann, Rainer W. (ed.), "Myrianthus holstii Engl. Urticaceae", Ethnobotany of the Mountain Regions of Africa, Cham: Springer International Publishing, pp. 717–719, doi:10.1007/978-3-030-38386-2_110, ISBN   978-3-030-38385-5 , retrieved 2024-02-06