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Variation and taxonomy in Hordeum depressum and in the H. brachyantherum complex (Poaceae)
Author(s) -
Bothmer Roland,
Jacobsen Niels,
Seberg Ole
Publication year - 1993
Publication title -
nordic journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.333
H-Index - 33
eISSN - 1756-1051
pISSN - 0107-055X
DOI - 10.1111/j.1756-1051.1993.tb00001.x
Subject(s) - biology , subspecies , disjunct , perennial plant , taxonomy (biology) , disjunct distribution , botany , poaceae , hordeum , ploidy , population , ecology , hordeum vulgare , phylogenetic tree , demography , biochemistry , sociology , gene
The variation pattern in the perennial Hordeum brachyantherum complex and in the annual H. depressum are described. The diploid form of H. brachyantherum s. lat., endemic to California in USA, previously recognized as a separate species is here treated as a subspecies ( H. brachyantherum ssp. californicum ). Despite its restricted distribution it shows a considerable variation and overlap in morphology with the tetraploid ssp. brachyantherum , and no unambiguous determination based on morphology between the two tax a is possible. The tetraploid cytotype has a large distribution area in western North America and easternmost Asia and a very wide morphological variation. It has also a small disjunct distribution area in easternmost Canada. A single hexaploid population from California is referred to ssp. brachyantherum .