Silvianthemum E.M.Friis

Plant Fossil Names Registry Number: PFN002046

Act LSID: urn:lsid:plantfossilnames.org:act:2046

Author: E. M. Friis

Rank: genus

Reference: Friis, E. M. (1990): Silvianthemum suecicum gen. et sp. nov., a new saxifragalean flower from the Late Cretaceous of Sweden. – Biologiske Skrifter 36: 1–35., link

Page of description: 7

Type

Original diagnosis/description

Flower minute, perfect and actinomorphic; floral parts whorled; perianth pentamerous, epigynous. Calyx of five free sepals, much smaller than petals, completely free in bud not covering the corolla; corolla of five free petals, quincuncially imbricate in bud. Stamens apparently in a single whorl; anthers tetrasporangiate, dorsifixed. Pollen grains isopolar, spherical to prolate, triaperturate with three long colpi; pollen wall tectate and perforate. Gynoecium trimerous, carpels basally connate and adnate to hypanthium to form an inferior, unilocular ovary; styles free, stout; stigmas capitate; placentation parietal, placentae large; ovules and seeds minute, numerous, anatropous with reticulate outer surface. Nectary disc-shaped. Pedicel, hypanthium and outer surface of sepals and petals with multicellular and multiseriate glandular trichomes; inner and outer surface of petals and surface of styles with short, unicellular, eglandular trichomes.

Etymology

In honour of Her Majesty, the Queen Silvia of Sweden.