Flora of the Southeastern United States

Dichanthelium hirstii (Swallen) Kartesz. Common name: Hirst Brothers' Witchgrass. Phenology: Jun-Sep. Habitat: Pond-cypress savannas, limesink depressions, and other seasonally ponded depression wetlands. Distribution: This distinctive species is known from only seven sites: two in NC, one in DE, two in NJ (one not seen since 1992), and two populations in GA (one considered historical, the other rediscovered in 2015; see McAvoy, Patrick, & Kruse [2015]).

Origin/Endemic status: Endemic

Taxonomy Comments: Described in 1961 (Swallen 1961), it is treated by some taxonomists as part of the D. aciculare group and by others as part of the D. dichotomum group; its affinities appear to lie with the former. See Schuyler (1996) for a discussion of the taxonomic distinctiveness of this species. The occurrence of this species in NC is documented in LeBlond & Sorrie (2001). A further assessment of the taxonomy and history of D. hirstii is found in LeBlond et al. (2017).

Synonymy ⓘ: = K4, LeBlond (2017a) in Weakley et al (2017), LeBlond et al (2017); = n/a — RAB; = Panicum hirstii Swallen — Schuyler (1996); < Dichanthelium dichotomum (L.) Gould ssp. roanokense (Ashe) Freckmann & Lelong — FNA25; < Panicum aciculare Desv. ex Poir. — C. Basionym: Panicum hirstii Swallen 1961

Links to other floras: < Dichanthelium dichotomum ssp. roanokense - FNA25

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: OBL

Heliophily ⓘ: 9