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Trigonobalanoidea
Genus Trigonobalanoidea Crepet, Nixon Amer. J. Bot., 76(6): 851. 23 Jun 1989
- Name
- Trigonobalanoidea
- Rank
- Genus
- Authors (Pub.)
- Crepet W. L.
Nixon K. C.
- Publication
- Earliest megafossil evidence of Fagaceae: phylogenetic and biogeographic implications [1989/6]
- Journal
- American Journal of Botany
- Volume
- 76
- Issue
- 6
- Page number
- 851
- Year
- 1989
- Parent Taxon
- [Family] Fagaceae
- Fossil Status
- infructescences
- Type
- Trigonobalanoidea americana
- Diagnosis
- Immature pistillate infructescences and dispersed fruits. Infructescences elongate, unbranched, with a straight to slightly curved axis bearing alternately arranged cupules. Cupules scaly, obscurely lobed, partially enclosing up to three trigonous fruits. Styles 3 per fruit, divergent, ca. 2 mm long. Stigmas terminal, capitate or discoid. Mature dispersed fruits: Fruits with valvate cupules enclosing about 213 of the fruit. Cupule scales tongue-shaped, arranged in (sometimes obscure) transverse rows. Fruits 1-3 in each cupule, trigonous, winged, with an indument of elongate simple trichomes particularly along wings and apices. Perianth often persistent
at fruit apex, with 3 styles that expand distally to the capitate stigmatic region. Triangular attachment scar visible basally on some solitary dispersed fruits.
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