*Digitaria ischaemum (Schreber) Muhlenberg. Smooth Crab Grass. Phen: Jul-Nov. Hab: Fields, lawns, disturbed areas. Dist: Native of Eurasia.

Origin/Endemic status: Eurasia

Taxonomy Comments: Two varieties have sometimes been recognized. Var. ischaemum has racemes (1-) 2-6, 1-9 (-10) cm long, mostly curved and plants mostly to 4 dm tall. Var. mississippiensis (Gattinger) Fernald has racemes 5-7, 6-15 cm long, mostly stiff and straight and plants to 10 dm tall.

Synonymy: = Ar, C, ETx1, FlGr, FNA25, Il, K1, K3, K4, Mi, Mo1, NE, NY, Pa, Tat, Tn, Va, W, WH3, WV; = Digitaria ischaemum (Schreb.) Muhl. var. ischaemum – RAB; = Syntherisma ischaemum (Schreb.) Nash – S; > Digitaria ischaemum (Schreb.) Muhl. var. ischaemum – F, G, HC; > Digitaria ischaemum (Schreb.) Muhl. var. mississippiensis (Gatt.) Fernald – F, G, HC; > Syntherisma humifusum (Pers.) Rydb. var. humifusum – S13; > Syntherisma humifusum (Pers.) Rydb.) var. mississippiense (Gatt.) Nash – S13

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: UPL
• Eastern Mountains and Piedmont: UPL
• Great Plains: UPL
• Midwest: FACU
• Northcentral & Northeast: FACU

Heliophily: 8