Archamamelis P.K.Endress et E.M.Friis
Plant Fossil Names Registry Number: PFN002041
Act LSID: urn:lsid:plantfossilnames.org:act:2041
Reference: Endress, P. K. & Friis, E. M. (1991): Archamamelis, hamamelidalean flowers from the Upper Cretaceous of Sweden. – Plant Systematics and Evolution 175(1–2): 101–114., link
Page of description: 112
Archamamelis bivalvis P.K.Endress et E.M.Friis
Flower small, apparently bisexual, perhaps functionally unisexual, actinomorphic, floral parts whorled, all whorls alternating; perianth hexa- to heptamerous, epigynous or semiepigynous; calyx of 6–7 sepals (?); corolla of 6–7 petals; androecium of 6–7 stamens; anthers basifixed, not well delimited from filament, with massive sterile apex, disporangiate, opening by a valve on each side, valve hinged on the ventral side; pollen grains isopolar, spheroidal to subprolate, tricolpate with long colpi, pollen wall tectate and perforate; staminodia 6–7 (?); gynoecium (2-? to) 3-merous, carpels basally connate and united with the hypanthium to form a semiinferior or inferior ovary; styles free; placentation possibly axile (?); ovules possibly two (?).
Name derived from greec "archä": beginning, and "Hamamelis": name of extant genus.