Mitrephora williamsii

Mitrephora williamsii
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Magnoliids
Order:	Magnoliales
Family:	Annonaceae
Genus:	Mitrephora
Species:	M. williamsii
Binomial name
	Mitrephora williamsii; C.B.Rob.

Mitrephora williamsii is a species of plant in the family Annonaceae. It is native to The Philippines.[1] Charles Budd Robinson, the Canadian botanist who first formally described the species, named it after Robert Statham Williams who collected the specimen that Robinson examined.[2]

Description

It is a tree reaching 12 meters in height. Its leaves are 20-32 by 7-11.5 centimeters and come to a point at their tips. The leaves are smooth and shiny green on their upper surfaces while their undersides are brown-green and slightly hairy. Its petioles are 12-18 millimeters long. Its fragrant flowers are red and yellow and are arranged in cymes opposite the leaves. Each flower is on a hairy pedicel 5-8 millimeters long. Its flowers have 3, oval-shaped sepals, 5-6 millimeters long, that come to a point at their tip. Its 6 petals are arranged in two rows of 3. The outer petals are 13-15 by 9-10 millimeters, hairy on their outer surface and smooth inside. The inner petals have a 10 by 2 millimeter claw below a 6-7 by 7.5 millimeter hood-shaped blade which is hairy on its inner surface. It has approximately 200-250 stamens that are 0.8-1 millimeter long.[3]

Reproductive biology

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

References

"Mitrephora williamsii C.B.Rob". Plants of the World Online. The Trustees of the Royal Botanic Gardens, Kew. n.d. Retrieved April 3, 2019.
"Williams, Robert Statham (1859-1945)". Global Plants. ITHAKA. n.d. Retrieved April 3, 2019.
Robinson, Charles Budd (1908). "Alabastra Philippinensia - I". Bulletin of the Torrey Botanical Club. 35 (2): 63–75. doi:10.2307/2479141. JSTOR 2479141.
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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[1] "Mitrephora williamsii C.B.Rob". Plants of the World Online. The Trustees of the Royal Botanic Gardens, Kew. n.d. Retrieved April 3, 2019.

[2] "Williams, Robert Statham (1859-1945)". Global Plants. ITHAKA. n.d. Retrieved April 3, 2019.

[3] Robinson, Charles Budd (1908). "Alabastra Philippinensia - I". Bulletin of the Torrey Botanical Club. 35 (2): 63–75. doi:10.2307/2479141. JSTOR 2479141.

[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.