Syrmatium was a formerly accepted genus of flowering plants in the family Fabaceae (legumes), native to the southwestern United States. , it was considered a synonym of Acmispon by Plants of the World Online, and only Acmispon was recognized by the Jepson eFlora.
Taxonomy Syrmatium belonged to a group of species traditionally placed in the tribe Loteae of the subfamily Faboideae. The taxonomy of this group is complex, and its division into genera has varied considerably. Many species of Syrmatium were formerly placed in a broadly defined genus Lotus. A molecular phylogenetic study in 2000 based on nuclear ribosomal ITS sequences confirmed the view that the "New World" (American) and "Old World" (African and Eurasian) species of Lotus did not belong in the same genus. Syrmatium was monophyletic.
Species Species that have been placed in Syrmatium include:
Syrmatium argophyllum (A.Gray) Greene = Acmispon argophyllus (A.Gray) Brouillet Syrmatium cytisoides (Benth.) Greene = Acmispon cytisoides (Benth.) Brouillet Syrmatium decumbens (Benth.) Greene = Acmispon decumbens (Benth.) Govaerts Syrmatium distichum Greene = Acmispon distichus (Greene) Brouillet Syrmatium haydonii (Orcutt) Brand = Acmispon haydonii (Orcutt) Brouillet Syrmatium junceum Benth.) Greene = Acmispon junceus (Benth.) Brouillet Syrmatium leucophyllum (Greene) Brand = Acmispon procumbens (Greene) Brouillet var. procumbens Syrmatium micranthum (Nutt. ex Torr. & A.Gray) Greene = Acmispon micranthus (Nutt. ex Torr. & A.Gray) Brouillet Syrmatium prostratum (Nutt.) Greene = Acmispon prostratus (Nutt.) Brouillet Syrmatium tomentosum (Hook. & Arn.) Vogel = Acmispon tomentosus (Hook. & Arn.) Govaerts Syrmatium veatchii (Greene) Greene = Acmispon dendroideus var. veatchii (Greene) Brouillet Syrmatium watsonii (Vasey & Rose) Brand = Hosackia alamosana Rose
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