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Erigeron rhizomatus
''Erigeron rhizomatus'' is a rare species of flowering plant in the aster family known by the common names Zuni fleabane and rhizome fleabane. It is native to western New Mexico and eastern Arizona in the United States.〔(Biota of North America Program 2014 county distribution map )〕 It is a federally listed threatened species.
''Erigeron rhizomatus'' was thought to be a New Mexico endemic until 1999, when some plants were found over the border in Arizona.〔(''Erigeron rhizomatus''. ) The Nature Conservancy.〕 These are located in the Chuska Mountains on the Navajo Nation, and they occur in 15 populations that make up one metapopulation.〔United States Fish & Wildlife Service. (''Erigeron rhizomatus'' Five-year Review. ) September 2007.〕 The two previously known metapopulations in New Mexico are composed of 24 populations in the Zuni, Datil, and Sawtooth Mountains.〔 These three metapopulations are geographically isolated from each other but are still similar in morphology.〔
==Characteristics==
''Erigeron rhizomatus'' is a perennial herb up to 45 cm (18 inches) tall, with a rhizome and large network of clumped, fibrous roots topped with a branching caudex. It produces one or more erect, rough-haired stems up to about 45 centimeters (18 inches) in maximum height. The leaves are lance-shaped near the base of the plant and much narrower and linear in shape toward the top of the stem. The inflorescence is usually a single flower head at the end of the stem with 25–45 white or purple-tinged ray florets each under a centimeter long. These surround many yellow disc florets.〔(''Erigeron rhizomatus''. ) Flora of North America.〕〔(''Erigeron rhizomatus''. ) New Mexico Rare Plant List.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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