Dichanthelium annulum (Ashe) LeBlond. Ringed Witchgrass. Phen: May-Oct. Hab: Dry sandy or rocky soil of open woods, dry grasslands, and barrens, and glades over serpentine, limestone, calcareous shales, and other high pH dry soils. Dist: NY, NJ, IN, and MO south to AL and MS, primarily in the Appalachian Province with very few occurrences in the Coastal Plain

Origin/Endemic status: Native

Other Comments: One of the more distinctive taxa within the D. dichotomum group by morphology, habitat, and range. Plants from se. MA with all leaves pubescent, glabrous internodes, and spikelets 2.2-2.5 mm long were described as Panicum annulum var. glabrescens, but belong to D. mattamuskeetense. Reported for Pulaski County, KY (Brock 2020).

Synonymy: = NY, Pa, Va, LeBlond (2001a); = Panicum annulum Ashe – F, HC, S; = Panicum annulum Ashe var. annulum – G; < Dichanthelium dichotomum (L.) Gould – K1, Gould & Clark (1978); < Dichanthelium dichotomum (L.) Gould ssp. mattamuskeetense (Ashe) Freckmann & Lelong – FNA25; < Dichanthelium dichotomum (L.) Gould var. dichotomum – K3, K4; < Panicum dichotomum L. – C, GW1, RAB; < Panicum dichotomum L. var. mattamuskeetense (Ashe) Lelong – Lelong (1984)

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Wetland Indicator Status:

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

Heliophily: 8