Monograph of Carex section Schiedeanae (Cyperaceae): Unexpected taxonomic and ecological diversity in a Mexican sedge clade  

作　　者：Anton A.Reznicek Maria del Socorro Gonzalez-Elizondo Marlene Hahn Mira Gamer Andrew L.Hipp 

机构地区：[1]University of Michigan Herbarium,3600 Varsity Drive,Ann Arbor,Ml 48108,USA [2]CIIDIR Instituto Politecnico Nacional,Sigma 119 Fracc.20 de Noviembre II,Durango,Dgo 34234,Mexico [3]The Morton Arboretum,4100 Illinois Route 53,Lisle,IL 60532,USA

出　　处：《Journal of Systematics and Evolution》2021年第4期698-725,共28页植物分类学报（英文版）

基　　金：ALH and AAR were partially supported by NSF Award#1255901.

摘　　要：Carex section Schiedeanae(subg.Euthyceras)has long been thought to comprise at most five species of Mexican sedges.Our morphological studies in the field and herbarium,however,supported by more recent DNA sequencing work,demonstrate that the section is,in fact,three times as species-rich,making it one of the largest sections in Mexico.Its 15 species range from Chihuahua to Tamaulipas south to Veracruz and Oaxaca;a single species,Carex muriculata,extends into the United States.The section has unusual inflorescences with simple(except in Carex complexa),uniformly androgynous,sessile spikes,utriculiform dadoprophylls,and perigynia with a unique combination of pubescence types composed of papillae;unicellular,simple hairs;and(in many species)multicellular tubercles.We recognize five previously described species(C.muriculata,Carex perstricta,Carex schiedeana,Carex stellata,and Carex vizarronensis)and describe 10 additional species(Carex angustilepis,Carex cabralii,Carex complexa,Carex dentata,Carex gypsophila,Carex mesophila,Carex paneroi,Carex planilamina,Carex revoluta,and Carex tehuacana).We have expanded the morphological features used in the section to include particularly anther,staminate scale,and style features,and more detailed micromorphology of the perigynia,especially indumentum.In total,13 of the 15 species recognized herein,with a total of 32 individuals,were examined for ETS and ITS for phylogenetic reconstruction.Phylogenetically,the xeric species(plus C.paneroi)form a grade leading to a clade of the more mesophytic species adapted to forest understories,plus the unique cliff dwelling C.complexa.

关 键 词：ENDEMISM Mexico new species phylogeny Sierra Madre systematics taxonomy 

分 类 号：Q94[生物学—植物学]