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 | |
Mitrephora williamsii is a species of plant in the family Annonaceae. It is native to The Philippines.[2] 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.[3]
Description
[edit]It is a tree reaching 12 meters in height. Its oval 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. The leaves have 20-25 pairs of secondary veins emanating from their midribs. Its petioles are 12-18 by 2.5-4 millimeters. 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.[4]
Reproductive biology
[edit]The pollen of M. williamsii is shed as permanent tetrads.[5]
Habitat and distribution
[edit]It has been observed growing in low elevation forests.[6]
References
[edit]- ^ Energy Development Corporation (EDC) (2020). "Mitrephora williamsii". IUCN Red List of Threatened Species. 2020: e.T153919775A157177796. doi:10.2305/IUCN.UK.2020-2.RLTS.T153919775A157177796.en. Retrieved May 26, 2021.
- ^ "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.
- ^ Merrill, Elmer D (1923). An Enumeration of Philippine Flowering Plants. Manila: Bureau of Printing. p. 169.
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