ISSN:
1615-6110
Keywords:
Dirachmaceae
;
Dirachma socotrana
;
Geraniales
;
Rhamnaceae
;
Ovule
;
seed
;
fruit
;
taxonomic relationships
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Dirachma has a bitegmic, crassinucellate and anatropous ovule with a single median provascular tegumentary bundle. The seed coat is characterized by an exotesta and an endotegmic pigment layer. Although the fruit ofDirachma superficially resembles that of theGeraniaceae s. str., the characters of ovule and seed do not support a relationship with that family. Also a relationship withBarbeyaceae, as suggested by recentrbcL studies, is not supported by seed anatomical characters. The true relationships ofDirachma are difficult to assess on the basis of ovule and seed characters alone. TheRhamnaceae may be a closer relative.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01464405
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