Actinocalyx E.M.Friis

Plant Fossil Names Registry Number: PFN001018

Act LSID: urn:lsid:plantfossilnames.org:act:1018

Author: E. M. Friis

Rank: genus

Reference: Friis, E. M. (1985): Actinocalyx gen. nov., sympetalous angiosperm flowers from the Upper Cretaceous of southern Sweden. – Review of Palaeobotany and Palynology 45(3–4): 171–183.

Page of description: 173

Type

Original diagnosis/description

Flowers small, actinomorphic and perfect, subtended by two persistent bracteoles. Perianth hypogynous, heterochlamydous; calyx persistent, formed from five free sepals, aestivation imbricate, sepals in the early stage upturned, later spreading, star-shaped, woody, with distinct parallel vascular bundles; corolla sympetalous with five ligulate lobes, constricted below the lobes. Androecium haplostemonous; stamens five, antisepalous; pollen minute, tricolporate, foveolate, and almost smooth. Ovary trilocular; styles three, slender; placentation central and basal; ovules many; fruit a loculicidal capsule, seeds small, anatropous, reticulate.

Etymology

From the star-shaped calyx.