Erigeron pusillus Nuttall. Southern Horseweed. Phen: (May-) Jul-Dec. Hab: Dunes, brackish marsh edges, coastal sand flats, sand prairies, old fields, disturbed areas, barrens and glades. Dist: Se. MA and CT west to s. IN, south to FL and TX, and south into tropical America.

Origin/Endemic status: Native

Taxonomy Comments: Cronquist (1980) considered this and Erigeron canadensis as "well-marked varieties".

Synonymy: = F, Tat; = Conyza canadensis (L.) Cronquist var. pusilla (Nutt.) Cronquist – C, G, GrPl, Mo2, Pa, SE1, Tx, Va, W; = Conyza canadensis (L.) Cronquist var. pusillus – Oh3; = Conyza parva Cronquist; = Erigeron canadensis L. var. pusillus (Nutt.) B.Boivin – NY, RAB; = Leptilon pusillum (Nutt.) Britton – S; < Conyza canadensis (L.) Cronquist – Ar, Fl7, FNA20, Il, K2, Mex, Tn, WH3; > Conyza canadensis (L.) Cronquist var. glabrata (A.Gray) Cronquist – NcTx; < Erigeron canadensis L. – K3, K4, NE

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FACU (taxonomic split from wetland indicator species)
• Eastern Mountains and Piedmont: FACU (taxonomic split from wetland indicator species)
• Great Plains: FACU (taxonomic split from wetland indicator species)
• Midwest: FACU (taxonomic split from wetland indicator species)
• Northcentral & Northeast: FACU (taxonomic split from wetland indicator species)

Heliophily: 8