The genus Hystrix was basically circumscribed as consisting of species that lacked glumes or had only vestigial glumes. It is always a risky business to base taxon delimitation on the absence of a character for absence can come about through many different paths. Hystrixappears to illustrate this risk. Its type species is Hystrix patula L., a North American species that has the genomic constitution StH. According to most people working in the Triticeae, such species belong in Elymus. If such a treatment is accepted, an appropriate generic name for the remaining species is need - unless they are placed in other genera.
The other North American species included in Hystrix, H. californica, has been shown to have a genomic constitution similar to that of species of Leymus. The same seems to be true of some other species. Some taxonomists, however, continue to recognize Hystrix as a genus. The following table is taken from Baden et al. (1997) treatment of the genus. It will serve as a useful page for keeping track of the species for which genomic data are, or are not, available.M.E. Barkworth
|Hystrix californica (Bol.) Kuntze||56 (Myers 1947; Jensen & Wang 1997)||NsX||Jensen & Wang 1997|
|Hystrix coreana (Honda) Ohwi||28 (Tsvelev 1983; Baden et al. 1997)||NsX||Ns present (Dubcovsky et al. 1997; Jensen & Wang 1998); 2/2 strong Ns bands; 1/3 Y bands, weak; 2 out of 3 weak St bands. (Svitashev et al. 1998)|
|Hystrix duthiei (Stapf) Bor|
|Hystrix duthiei (Stapf) Bor subsp. duthei||28 (Baden et al. 1997)||NsY||2/2 strong Ns bands; 1/3 Y bands, weak; no St band (Svitashev et al. 1998)|
|Hystrix duthiei subsp. japonica (Hack.) Baden et al.|
|Hystrix duthiei (Stapf) Bor subsp. longearistata (Hack.) Baden et al.||28 (Osada 1989)|
|Hystrix komarovii (Roshev.) Ohwi||28 (Tsvelev 1983; Baden et al. 1997)||NsY||2/2 strong Ns bands; 1/3 Y bands, weak (Svitashev et al. 1998)|
Hystrix patula L.
|28 (Dewey 1982; Love 1984)||StH||(Dewey 1983); 1/3 St bands, strong; 1/2 Ns bands, weak (Svitashev et al 1998)|
|Hystrix sibirica (Trautv.) Kuntze||28 (Tzvelev 1983)|