Pseuduvaria philippinensis

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Pseuduvaria philippinensis
Pseuduvaria philippinensis.jpg
Herbarium specimen of Pseuduvaria philippinensis. [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. philippinensis
Binomial name
Pseuduvaria philippinensis

Pseuduvaria philippinensis is a species of plant in the family Annonaceae. [2] It is native to the Philippines. [1] Elmer Drew Merrill, the botanist who first formally described the species, named it after the Philippines where the specimen he examined was collected in the Province of Quezon (then called the Province of Tayabas). [3]

Contents

Description

It is a tree reaching 18 meters in height. The young, yellow-brown to dark brown branches are densely hairy. Its elliptical, papery to leathery leaves are 9.5-24 by 2.5-7 centimeters. The leaves have flat to pointed bases and tapering tips, with the tapering portion 5-20 millimeters long. The leaves are sparsely hairy on their upper surfaces and densely hairy on their lower surfaces. The leaves have 10-18 pairs of secondary veins emanating from their midribs. Its very densely hairy petioles are 3-11 by 1–2.5 millimeters with a broad groove on their upper side. Its Inflorescences occur in groups of 3–13 on branches, and are organized on indistinct peduncles. Each inflorescence has a solitary flower. Each flower is on a very densely hairy pedicel that is 11-20 by 0.5-1 millimeters. The pedicels are organized on a rachis up to 5 millimeters long that have 2-3 bracts. The pedicels have a medial, very densely hairy bract that is 0.5-1.5 millimeters long. Its flowers are unisexual. Its flowers have 3 free, triangular sepals, that are 0.5-2 by 1-2 millimeters. The sepals are hairless on their upper and lower surfaces, and hairy at their margins. Its 6 petals are arranged in two rows of 3. The blackish-yellow, oval, outer petals are 1-2 by 1–2.5 millimeters. The outer petals have hairless upper surfaces, except near their base, and densely hairy lower surfaces. The inner petals are blackish-yellow, and arch-shaped to inverted heart-shaped. The inner petals have a 2.5-5.5 millimeter long claw at their base and a 4.5-7.5 by 3-5 millimeter blade. The inner petals have flat bases and rounded to slightly notched tips. The inner petals are densely hairy on their upper and lower surfaces. Male flowers have up to 73 stamens that are 0.5-0.8 by 0.4-0.6 millimeters. Female flowers have about 7 carpels that are 1.5-1.8 by 0.6-1 millimeters. Each carpel has 2-9 ovules arranged in a row. Female flowers usually have a sterile stamen. The fruit occur in clusters of 2–6 on densely hairy pedicles that are 13-22 by 1–2.5 millimeters. The fruit are globe-shaped and 11-17 by 9-16 millimeters. The fruit are wrinkly, and very densely hairy. Each fruit has 2-9 wrinkly, hemispherical to lens-shaped seeds that are 7–8.5 by 4-4.5 by 2–3.5 millimeters. [4]

Reproductive biology

The pollen of P. philippinensis is shed as permanent tetrads. [5] [6]

Habitat and distribution

It has been observed growing in damp habitats in lowland forests at elevations of up to 50 meters. [4]

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References

  1. 1 2 "Pseuduvaria philippinensis Merr". Plants of the World Online. The Trustees of the Royal Botanic Gardens, Kew. n.d. Retrieved August 3, 2021.
  2. ↑ "Pseuduvaria philippinensis Merr. | COL". www.catalogueoflife.org. Retrieved 2021-08-03.
  3. ↑ Merrill, E.D. (1915). "Studies on Philippine Anonaceae, I". The Philippine Journal of Science (in English and Latin). 10 Pt. C [Botany]: 227–264.
  4. 1 2 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. ↑ 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.
  6. ↑ Walker, James W. (1971). "Pollen Morphology, Phytogeography, and Phylogeny of the Annonaceae". Contributions from the Gray Herbarium of Harvard University. 202 (202): 1–130. JSTOR   41764703.
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