Taxaceae


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Related to Taxaceae: Cupressaceae, Pseudotsuga, yew family

Taxaceae

 

a family of gymnospermous plants. Representatives of Taxaceae are evergreen trees and shrubs, usually heavily branched. The leaves, for the most part, are needle-like, linear, or linear-lanceolate and often asymmetrical. The plants are most often dioecious. The male spikelets, which are found in the axils of the leaves, may be solitary or gathered into catkins. The fruits are greatly reduced and are not shaped like cones; at the base they are surrounded by several pairs of scalelike leaves and bear one ovule. Mature seeds are surrounded by a fleshy aril. The family consists of approximately 20 species, which grow mainly in the northern hemisphere. There are five genera: Taxus, Torreya, Pseudotaxus (one species, in China), Austrotaxus (one species, in New Caledonia), and Amentotaxus (several species, in China and Vietnam).

References in periodicals archive ?
The principal area of disagreement among gymnosperm taxonomists concerning the Taxaceae has been the evolutionary position of the family in relation to other groups of conifers.
Two tribes have been distinguished in the Taxaceae (Janchen, 1949).
Amentotaxus has been allied with Cephalotaxus as a member of the Cephalotaxaceae, the sister family and best outgroup to the Taxaceae (Hart, 1987; Keng, 1969).
Foliar resin is present in the leaves and arils as in Torreya and the Cephalotaxaceae, although Amentotaxus is the only genus of the Taxaceae that has its resin organized into a duct or canal (Ferguson, 1978; Jeffrey, 1903; Keng, 1969; Singh, 1961).
Austrotaxus may also be distinguished by its apparent lack of spiral thickenings on the tracheid walls that is so distinctive of Taxaceae wood (Greguss, 1955).
Torreya is unique in the Taxaceae in having embryogenesis with cleavage rather than simple polyembryony and a cell wall formed at the 4 or 8 nuclei stage (Doyle & Brennan, 1971; Tang et al.
Kayaflavone, which has not been found in other genera of Taxaceae, is the only biflavonoid that has been isolated from Torreya (He et al.
On Nothotaxus, a new genus of the Taxaceae, from eastern China.
Biochemical systematics of gymnosperms (3) - On the syststematic position of Taxaceae from their seed protein peptides and needle peroxidases.
Kritische Ubersicht uber die neuere Literatur betreffend die Familie der Taxaceae.
The genera of Taxaceae in southeastern United States.
On the systematic position of Taxaceae from the embryo-logical and anatomical studies.