论文信息 - DISTRIBUTION AND TAXONOMY OF SYMPHYOTRICHUM SERICEUM AND S. PRATENSE (ASTERACEAE: ASTEREAE)

DISTRIBUTION AND TAXONOMY OF SYMPHYOTRICHUM SERICEUM AND S. PRATENSE (ASTERACEAE: ASTEREAE)

Symphyotrichum sericeum and S. pratense are distinct, non-intergrading species primarily of the central U.S.A., sympatric only in Texas. The densest distribution of S. sericeum is in north-central states, with disjunct populations and population systems extending southward to Arkansas, Oklahoma, and Texas. The densest distribution of S. pratense is in Texas, southern Arkansas, and Louisiana, with disjuncts extending to Alabama, Florida, Georgia, Kentucky, Mississippi, Tennessee, and Virginia, with an historical record from North Carolina. Specimens from these disjunct sites in the southeastern U.S., some of which are still being listed as S. sericeum on state checklists and rare species reports, are here treated as S. pratense . Symphyotrichum sericeum consists largely of diploid populations, while both tetraploid and diploid populations occur in S. pratense . County-level distributions of both species are mapped. Symphyotrichum sericeum is statelisted in 4 states and S. pratense in 7 states.

G. Nesom | C. Witsell | Ronald L. Jones

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