Neostenanthera gabonensis

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Neostenanthera gabonensis
S. gabonensis.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Magnoliids
Order: Magnoliales
Family: Annonaceae
Genus: Neostenanthera
Species:
N. gabonensis
Binomial name
Neostenanthera gabonensis
Synonyms
  • Neostenanthera bakuana(A.Chev. ex Hutch. & Dalziel) Exell
  • Oxymitra gabonensisEngl. & Diels
  • Stenanthera gabonensis(Engl. & Diels) Engl. & Diels

Neostenanthera gabonensis is a species of plant in the family Annonaceae. It is native to Cabinda Province, Cameroon, Equatorial Guinea, Gabon, Ghana, Ivory Coast, Liberia, and The Republic of the Congo. [2] Heinrich Gustav Adolf Engler and Ludwig Diels, the German botanists who first formally described the species, using the basionym Oxymitra gabonensis, named it after Gabon where the specimen they examined was found near a site they identified as Sibange-Farm. [3]

Contents

Description

It is a shrub or small tree reaching 6 meters in height. Its oblong to lance-shaped leaves are 5.2-20.9 by 2.3-7.1 centimeters. The tips of the leaves taper to a point, and their bases are wedge-shaped to rounded. The upper surface of the leaves are green and hairless to slightly hairy, their lower surface is green to greyish, waxy blue and slightly hairy. The leaves have 8-17 pairs of secondary veins emanating from their midribs. Its slightly hairy petioles are 2.6-12.9 by 0.7-1.7 millimeters. It usually has solitary flowers that are born on 31.3-71.7 millimeter, slightly hairy pedicels. The pedicels are attached to 1-3.7 by 1.7 millimeter peduncles. It has 3 triangular to oval, slightly hairy, sepals are 0.5-1.8 by 0.7-1.7 millimeters. The tips of the sepals are pointed, or taper to a point. Its flowers have 6 petals in two rows of three. The outer petals have a total length of 7.1-46.5 millimeters long. The spoon-shaped basal portion is 3-7 by 3.5-5.3 millimeters with a hairless upper side and slightly hairy underside. The apical lance-shaped portion of the outer petal is 4.1-40.6 by 1-5.9 millimeters and covered in white shaggy hairs, particularly near the edges on the upper side. The inner petals have a total length of 3.1-9.8 millimeters and densely covered in fine hairs on its upper surface. The basal portion is 2.6-6.9 by 3.7-5.4. The apical portion is 0.5-4.5 by 1.2-3.4 with an expended tip that is curved inward. Its flowers have 75-103 stamen that are 1.8-2.9 millimeters long. the tissue connecting the lobes of the anthers extends upward for 0.5-1.5 millimeter and is slightly hairy. Its flowers have 23-38 carpels that are 2.1-3.5 by 0.2-0.6 millimeters with 0.5-1.5 millimeters long styles that that have a knee-like bend. Each spindle-shaped fruit is 6-26.2 by 5.6-11.8 millimeters with a pointed base and a 0.5-4.1 millimeter long tapered tip. The fruit are ribbed and slightly hairy. Each fruit is attached to a 2.9-6.1 centimeter long pedicel, which in turn is attached to a 1.5-1.9 centimeter long peduncle. The fruit have spindle-shaped seeds that are 13.4-22.2 by 4.7-6.9 millimeters. [4]

Reproductive biology

The pollen of N. gabonensis is shed as permanent tetrads. [5]

Habitat and distribution

It has been observed growing near rivers, in swampy areas, in the undergrowth of primary and secondary forests, at elevations from 15-620 meters. [4]

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References

  1. ↑ Cosiaux, A.; Couvreur, T.L.P.; Erkens, R.H.J. (2019). "Neostenanthera gabonensis". IUCN Red List of Threatened Species . 2019: e.T133039474A133042989. doi: 10.2305/IUCN.UK.2019-3.RLTS.T133039474A133042989.en . Retrieved 20 November 2021.
  2. ↑ "Neostenanthera gabonensis (Engl. & Diels) Exell". Plants of the World Online. The Trustees of the Royal Botanic Gardens, Kew. n.d. Retrieved June 14, 2021.
  3. ↑ Engler, A.; Diels, L. (1899). "Diagnosen Neuer Afrikanischer Pflanzenarten: 4. Anonaceae" [Diagnoses of New African Plant Species: 4. Anonaceae]. Notizblatt des Königlichen Botanischen Gartens und Museums zu Berlin (in German). 2 (17): 297.
  4. 1 2 Fero, Maximiliano; Aedo, Carlos; Cabezas, Francisco; Velayos, Mauricio (2014). "Taxonomic Revision of Neostenanthera (Annonaceae)". Systematic Botany. 39 (1): 17–30. doi:10.1600/036364414X678071. ISSN   0363-6445. S2CID   84334715.
  5. ↑ Walker, James W. (1971). "Pollen Morphology, Phytogeography, and Phylogeny of the Annonaceae". Contributions from the Gray Herbarium of Harvard University. 202 (202): 1–130. doi: 10.5962/p.272704 . JSTOR   41764703. S2CID   249081277.
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