Reproductive and Vegetative Organs of Browniea gen. n. (Nyssaceae) from the Paleocene of North America

Autor:	Steven R. Manchester, Leo J. Hickey
Rok vydání:	2007
Předmět:	biology Tapiscia Camptotheca Cornales Plant Science medicine.disease_cause biology.organism_classification Inflorescence Viburnum Genus Pollen Botany medicine Nyssaceae Ecology Evolution Behavior and Systematics
Zdroj:	International Journal of Plant Sciences. 168:229-249
ISSN:	1537-5315 1058-5893
DOI:	10.1086/509661
Popis:	We recognize a new genus of Nyssaceae on the basis of abundant foliage and reproductive remains from the Paleocene of North America. Browniea gen. n. is known from leaves, inflorescences, and fruits co‐occurring in at least 30 sites in Wyoming, Montana, North and South Dakota, Saskatchewan, and Alberta, ranging from Maastrichtian to uppermost Clarkforkian. The simple, serrate leaves of Browniea serrata (Newberry) comb. n. were previously referred to such diverse genera as Alnus, Amelancier, Celastrus, Eucommia, Tapiscia, and Viburnum. Inflorescences and infructescences are globose heads borne on long, slender peduncles. Each fruiting head bears numerous elongate fruits with five persistent epigynous sepals and a single style with two stigmatic arms. The stamens have globose anthers with normal slitlike dehiscence and contain prolate tricolporate pollen with microreticulate ornamentation. Although the infructescences and fruits resemble those of extant Camptotheca, Browniea is distinguished by distinct cal...
Databáze:	OpenAIRE
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