Commelina erecta Linnaeus var. angustifolia (Michaux) Fernald. Sand Dayflower. Phen: Jun-Oct. Hab: Dunes and dry sand flats on barrier islands, longleaf pine sandhills, other dry sandy sites, shale barrens, other dry rocky sites. Dist: E. NC south to s. FL, west to TX, and north and west in the interior to IA, nw. NE, CO, and NM; also apparently in Central and South America.

ID notes: Contrary to the specific epithet, C. erecta var. angustifolia is a trailing plant, the stems sometimes as long as 1.3 m.

Origin/Endemic status: Native

Taxonomy Comments: The taxonomy and distribution of the varieties here recognized need further study.

Synonymy: = C, ETx1, F, G, Il, K1, NcTx, Tat, Tx, WV, Brashier (1966); > Commelina angustifolia Michx. – S, S13; > Commelina crispa Wooton – S, S13; > Commelina elegans Kunth – Bah; < Commelina erecta L. var. angustifolia (Michx.) Fernald – FNA22, K3, K4, Meso6, RAB, Tn, W, WH3, Faden (1993), Tucker (1989); < Commelina erecta L. var. angustifolia (Michx.) Fernald – GrPl; > Commelina nashii Small – S13

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Wetland Indicator Status:

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

Heliophily ?: 8