Pseuduvaria obliqua

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Pseuduvaria obliqua
Pseuduvaria obliqua.jpg
Herbarium specimen of Pseuduvaria obliqua. [1]
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Magnoliids
Order: Magnoliales
Family: Annonaceae
Genus: Pseuduvaria
Species:
P. obliqua
Binomial name
Pseuduvaria obliqua

Pseuduvaria obliqua is a species of plant in the family Annonaceae. [3] It is native to Borneo. [1] Yvonne Su and Richard Saunders, the botanists who first formally described the species, named it after its slightly uneven (obliqua, in Latin) leaf bases. [4] [5]

Contents

Description

It is a tree reaching 20 meters in height. The young, light to dark brown branches are very densely hairy and have sparse lenticels. Its elliptical to oval, papery leaves are 13-25 by 5-8 centimeters. The bases of the leaves are slightly uneven and pointed to broadly heart-shaped. The leaves have tapering tips, with the tapering portion 12-25 millimeters long. The leaves are hairless on their upper surfaces and sparsely hairy on their lower surfaces. The leaves have 14-18 pairs of secondary veins emanating from their midribs. Its very densely hairy petioles are 6-15 by 1.5-2.5 millimeters with a broad groove on their upper side. Its Inflorescences occur in clusters of 2–4 on branches, and are organized on indistinct peduncles. Each inflorescence has a single flower. Each flower is on a densely hairy pedicel that is 9-16 by 0.4-0.8 millimeters. The pedicels are organized on a rachis up to 5 millimeters long that have up to 4 bracts. The pedicels have a medial, very densely hairy bract that is 0.7-1 millimeters long. Its flowers are unisexual. Its flowers have 3 free, oval sepals, that are 1-1.5 by 1-1.5 millimeters. The sepals are hairless on their upper surface, densely hairy on their lower surface, and hairy at their margins. Its 6 petals are arranged in two rows of 3. The cream-colored to light brown, oval, outer petals are 1.5-2.5 by 1.5-2 millimeters with hairless upper and densely hairy lower surfaces. The cream-colored to light brown, triangular inner petals have a 2.5-5.5 millimeter long claw at their base and a 4.5-8 by 2.5-4 millimeter blade. The inner petals have slightly heart-shaped bases and pointed tips. The inner petals are very densely hairy on their upper and lower surfaces. The inner petals sometimes have a solitary, rod shaped, smooth, raised gland on their upper surface. The male flowers have 27-37 stamens that are 1-1.5 by 2-2.5 millimeters. The female flowers have 9-11 carpels that are 1.4-1.7 by 0.6-1 millimeters. Each carpel has 1-2 ovules arranged in a row. The fruit occur in clusters of 3-6 that are organized on indistinct peduncles. The fruit are attached by slightly hairy pedicles that are 19-21 by 1.5 millimeters. The green, mature globe-shaped fruit are 9-13 by 9-12 millimeters. The fruit are wrinkly, and densely hairy. Each fruit has up to 2 spherical, wrinkly seeds that are 6.5-8 by 6.5-7 by 3.5-4 millimeters. [4]

Reproductive biology

The pollen of P. obliqua is shed as permanent tetrads. [6]

Habitat and distribution

It has been observed growing in forests at elevations of 100–750 meters. [4]

Related Research Articles

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<i>Pseuduvaria mulgraveana</i> Species of plant in the family Annonaceae

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<i>Pseuduvaria philippinensis</i> Species of plant in the family Annonaceae

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<i>Pseuduvaria sessilifolia</i> Species of plant in the family Annonaceae

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Pseuduvaria silvestris is a species of plant in the family Annonaceae. It is native to New Guinea. Ludwig Diels, the botanist who first formally described the species under the basionym Orophea silvestris, named it after the forested habitat the specimens he examined were found growing in near the Waria River.

References

  1. 1 2 "Pseuduvaria obliqua Y.C.F.Su & R.M.K.Saunders". Plants of the World Online. The Trustees of the Royal Botanic Gardens, Kew. n.d. Retrieved July 23, 2021.
  2. ↑ Verspagen, N.; Erkens, R.H.J.; Daniels, A. (2021). "Pseuduvaria obliqua". IUCN Red List of Threatened Species . 2021: e.T179886740A179886744. doi: 10.2305/IUCN.UK.2021-2.RLTS.T179886740A179886744.en . Retrieved 20 June 2022.
  3. ↑ "Pseuduvaria obliqua Y. C. F. Su & R. M. K. Saunders". Catalogue of Life. Species 2000. n.d. Retrieved July 23, 2021.
  4. 1 2 3 Su, Yvonne C.F.; Saunders, Richard M.K. (2006). Monograph of Pseuduvaria (Annonaceae). Systematic Botany Monographs. Vol. 79. American Society of Plant Taxonomists. pp. 1–204. JSTOR   25027955.
  5. ↑ Stearn, William (2004). Botanical Latin. Portland, Ore. Newton Abbot: Timber Press David & Charles. ISBN   9780881926279.
  6. ↑ Su, Yvonne C. F.; Saunders, Richard M. K. (2003). "Pollen structure, tetrad cohesion and pollen-connecting threads in Pseuduvaria (Annonaceae)". Botanical Journal of the Linnean Society. 143 (1): 69–78. doi: 10.1046/j.1095-8339.2003.00204.x . ISSN   1095-8339.
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