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Eurybia hemisphaerica (Alexander) G. L. Nesom is native to dry to mesic, less commonly in moist, sandy-loamy soils, open habitats, open oak-pine or oak-hickory woods, bottomlands, prairies, pastures, roadsides in two disjunct areas east and west of the Mississippi River from southeastern Kansas to eastern Tennessee south to east Texas and Panhandle Florida and southwest Georgia (). The species is distinguished from E. paludosa but its racemiform array of heads.  The following names are synonyms: Aster hemisphaericusÌý´¡±ô±ð³æ²¹²Ô»å±ð°ù,ÌýA. gattingeriÌý´¡±ô±ð³æ²¹²Ô»å±ð°ù,ÌýA. paludosus Ait. subsp. hemisphaericus (Alexander) Cronquist; A. paludosusÌý±¹²¹°ù.Ìýhemisphaericus (Alexander) Waterfall; A. pedionomusÌý´¡±ô±ð³æ²¹²Ô»å±ð°ù;ÌýA. verutifoliusÌý´¡±ô±ð³æ²¹²Ô»å±ð°ù;ÌýHeleastrum hemisphaericum (Alexander) Shinners.

The species is diploid (2n=18) east of the Mississippi River and predominantly tetraploid (2n=36) west of the Mississippi River. Supernumerary chromosomes have been reported resulting in confusion of the chromosomal base number which Semple (1982) showed was x=9 not x=5.

Semple, J.C. 1982. Observations on morphology and cytology of Aster hemisphaericus, A. paludosus, and A. chapmanii (Asteraceae) with comments on the chromosomal base number and phylogeny of Aster²õ³Ü²ú²µ.ÌýAsterÌý²õ±ð³¦³Ù.ÌýHeleastrum. Syst. Bot. 7: 60-70.   [Correction of Fig. Legend. Syst. Bot.  7: 501-501 1982.]

Last revised 12 May 2025 by J.C. Semple

© 2025 J.C. Semple, including all photographs unless otherwise indicated