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Archaestella verticillata
Archaestella verticillata Mas. Takah., Herendeen, X.-H. Xiao J. Pl. Res. [8]. 11 May 2017
- Name
- Archaestella verticillata
- Rank
- Species
- Original spelling
- verticillatus
- Generic Name
- [Genus] Archaestella
- Authors (Pub.)
- Takahashi M.
Herendeen P. S.
Xiao X.-H.
- Publication
- Two early eudicot fossil flowers from the Kamikitaba assemblage (Coniacian, Late Cretaceous) in northeastern Japan [2017/5]
- Journal
- Journal of Plant Research
- Page number
- [8]
- Year
- 2017
- Fossil Status
- flowers
- Stratigraphy
- Coniacian
- Location
- Kamikitaba locality, Hironomachi, Fukushima Prefecture, NE Japan
- Paleoregion
- Eurasia (Japanese Archipelago)
Data for Holotypus
- Repository
- Field Museum, Chicago, USA
- Repository Number
- PP56485
- Diagnosis
- Flower pedicellate, actinomorphic, bisexual, half-inferior, and multicarpellate. Floral receptacle concave with a perigynous perianth consisting of several tepals, borne in two cycles, around the rim. Androecium consisting of ca. 120 stamens with clear differentiation into anther and filament. Gynoecium is syncarpous and consisting of a whorl of 10 conduplicate carpels that are laterally connate basally but distinct distally, with a conspicuous dorsal bulge, including a central cavity. Styles recurved with a papillate and ventrally decurrent stigma. Ovules ca. 10 per carpel, marginal, pendulous from the broad, concrescent oblique summit of the locule. Seeds with chalazal, apical and lateral wing-like extensions. Pollen grains, tricolpate, with reticulate exine pattern. Dimensions: Pedicel of flower, 0.1 mm in diameter, developed to 1.0 mm in diameter in fruit. Flower, 1.2 mm in diameter and 1.2 mm high, developed to 4.2 mm in diameter and 4.0 mm high in fruit. Tepals ca. 0.8 mm wide, length unknown (incomplete). Stamens, 0.2–0.3 mm in length; anthers 0.1 mm in length; filaments, 0.1–0.2 mm. Pollen grains 9.3 μm in equatorial diameter, no data on polar axis. Gynoecium, 0.8 mm in diameter, 0.6 mm high, developed to 3.9 mm in diameter, 1.7 mm high in fruit. Stigma 0.1 mm wide, 0.1 mm high.
