Mitrephora polypyrena

Mitrephora polypyrena is a species of plant in the family Annonaceae. It is native to Java, the Lesser Sunda Islands, and Myanmar.[1]

Mitrephora polypyrena
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Magnoliids
Order: Magnoliales
Family: Annonaceae
Genus: Mitrephora
Species:
M. polypyrena
Binomial name
Mitrephora polypyrena
Synonyms

Kinginda macrantha (Hassk.) Kuntze
Kinginda polypyrena Kuntze
Mitrephora javanica Backer
Mitrephora macrantha Hassk.
Uvaria polyprena Blume

Description

It is a tree reaching 20 meters in height. Its leathery leaves are 8-22.5 by 3.5-9 centimeters and come to a point at their tips. The leaves are smooth and shiny on their upper surfaces, while their undersides are slightly hairy. Its petioles are 4.5-11 millimeters long. Its flowers are arranged in groups of 3 or fewer on a rachis. Each flower is on a fleshy, slightly hairy pedicel 20-40 millimeters long. Its flowers have 3, oval-shaped sepals that are 5-7.5 by 5.5-7.5 millimeters. The outside of the sepals are densely hairy, while their inner surfaces are smooth. Its 6 petals are arranged in two rows of 3. The yellow, oval-shaped outer petals are 24-36 by 18-28 millimeters and come to a point at their tip. The outside surface of the outer petals are densely hairy, while their inner surface is slightly hairy. The inner petals are white with reddish-purple highlights and 17-22 by 9.5-16 millimeters. The outside surface of the inner petals is densely hairy while the tip of the inner surface has long hairs.[2][3]

Reproductive biology

The pollen of M. polypyrena is shed as permanent tetrads.[4]

gollark: Yes, this is also not ideal.
gollark: They didn't have swivel chairs then, among other things.
gollark: I would *not* like 500 BC.
gollark: Another issue is that the requirement that the human running everything not have to look far to place the next rock (→ cellular automaton is needed, as is said in the image) means there's even more indirection for useful computing, so you need even more rocks and time!
gollark: Also, you'll get bored.

References
  1. "Mitrephora polypyrena (Blume) Zoll". Plants of the World Online. The Trustees of the Royal Botanic Gardens, Kew. n.d. Retrieved March 26, 2019.
  2. Zollinger, H. (1858). "Ueber die Anonaceen des Ostindischen Archipels" [About the Anonaceae of the East Indian Archipelago]. Linnaea : Ein Journal für die Botanik in ihrem ganzen Umfange (in German and Latin). 29: 297–325.
  3. Weerasooriya, Aruna D.; Saunders, Richard M. K. (2010). "Monograph of Mitrephora (Annonaceae)". Systematic Botany Monographs. 90: 1–167. JSTOR 41059228.
  4. 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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