Pseudoxandra williamsii

Pseudoxandra williamsii is a species of plant in the Annonaceae family.[2] It is endemic to Peru.[1] Robert Elias Fries, the Swedish botanist who first formally described the species using the basionym Cremastosperma williamsii, named it after Llewelyn W. Williams, the Welsh economic botanist, who collected the holotype specimen he examined.[3]

Pseudoxandra williamsii
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Magnoliids
Order: Magnoliales
Family: Annonaceae
Genus: Pseudoxandra
Species:
P. williamsii
Binomial name
Pseudoxandra williamsii
Synonyms

Cremastosperma williamsii R.E.Fr.

Description

It is a bush. Its shiny, brown, papery leaves are 16-20 by 4-5 centimeters and come to a point at their tips. The mature leaves are hairless on their upper surfaces and lightly hairy on their lower surfaces. The leaves have 10-12 distinct, curved secondary veins emanating from the primary vein. Its petioles are 4-5 millimeters long. Each flower is on a short pedicel less than 1 millimeter long. Its flowers have 3 oval-shaped sepals that are 5 by 8 millimeters. The outer surface of the sepals is covered in dense white hairs. Its 6 petals are arranged in two rows of 3. The outer petals 11-12 by 9 millimeters and their outer surface is covered by dense white hairs. The inner petals are 6-7 by 5-6 millimeters and concave. The inner petals are smooth on their outer surface except for a hairy patch running from the base to the tip. It has numerous stamens that are 3.5-4 millimeters long.[4]

Reproductive biology

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

References
  1. World Conservation Monitoring Centre 1998. Pseudoxandra williamsii. 2006 IUCN Red List of Threatened Species. Downloaded on 23 August 2007.
  2. "Pseudoxandra williamsii (R.E.Fr.) R.E.Fr". Plants of the World Online. The Trustees of the Royal Botanic Gardens, Kew. n.d. Retrieved May 23, 2019.
  3. Natural History Museum (n.d.). "Williams, Llewelyn W. (1901-1984)". Global Plants. ITHAKA. Retrieved May 23, 2019.
  4. Maas, Paul J.M.; Westra, Lubbert Y.Th. (2003). "Revision of the Neotropical genus Pseudoxandra (Annonaceae)". Blumea - Biodiversity, Evolution and Biogeography of Plants. 48 (2): 201–259. doi:10.3767/000651903X674955. ISSN 0006-5196.
  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. JSTOR 41764703.


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