Pseuduvaria obliqua
Herbarium specimen of Pseuduvaria obliqua.[1]
Scientific classification Edit this classification
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]

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]

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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