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Pentapetalum
Genus Pentapetalum Mart.-Mill., Crepet, Nixon Amer. J. Bot., 96(5): 935. 1 May 2009
- Name
- Pentapetalum
- Rank
- Genus
- Authors (Pub.)
- Martínez-Millán M.
Crepet W. L.
Nixon K. C.
- Publication
- Pentapetalum trifasciculandricus gen. et sp. nov., a thealean fossil flower from the Raritan Formation, New Jersey, USA (Turonian, Late Cretaceous) [2009/5]
- Journal
- American Journal of Botany
- Volume
- 96
- Issue
- 5
- Page number
- 935
- Year
- 2009
- Parent Taxon
- [Order] Theales
- Fossil Status
- flowers
- Type
- Pentapetalum trifasciculandricum
- Diagnosis
- Flowers bisexual, pentamerous, actinomorphic,
and with a flat, wide, somewhat triangular receptacle.
Calyx and corolla well-differentiated, sepals and petals free from
one another. Androecium of numerous tetrasporangiate stamens
grouped in three clusters that resemble fascicles. Filaments longest
at the cluster’s center and decrease in size laterally. Gynoecium
tricarpellate with three distinct styles. Ovary trilocular with axile
placentation. This genus can be easily distinguished among the
fossil flowers of the Raritan Formation primarily by its numerous
nonlaminar stamens of unequal sizes. Although very similar to extant
Stewartia and Gordonia, it differs in having a tricarpellate gynoecium.
Nomenclatural synonyms
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