| Author | LeBlond & S.C. Carr | |
| Distribution | This species was newly described in the Journal of the Botanical Institute of Texas vol 18: 64-66, in 2024. LeBlond and Carr originally verified it from only Clay and Volusia counties in peninsular Florida. However, in 2026 LeBlond annotated a specimen collected by Eric Ungberg from Sandhills Game Land in Richmond County as this species; thus disjunct from the FL locations.
Peninsular Florida; disjunct to Sandhills region of NC. | |
| Abundance | No data | |
| Habitat | The SGL plants were growing in dry longleaf pine sandhills with Pinus palustris, Ageratina aromatica, Eupatorium linearifolium, Sericocarpus spp., Anatherum spp. (formerly Andropogon), Aristida stricta, and Vernonia angustifolia. | |
| Phenology | | |
| Identification | D. arenicollinum is in the section Pedicellata, which notably have a hard, cormlike base and lack a basal rosette. Spikelets are 2.3-2.9 mm long. From other Dichanthelium species in NC, see the key in Weakley (2025). The gestalt of the plant is one of several leaves on lower main stem and on basal branches, few shorter leaves on mid and upper stem, and an open inflorescence atop a long stem. | |
| Taxonomic Comments | A note about Dichanthelium: This genus is not impossible to identify to species! But it takes applied effort over a period of time in order to learn the various species and what their morphological limits are. We strongly recommend that you read the introduction to the treatment in Weakley et al. (2025), written by Richard LeBlond. LeBlond has made order out of near chaos, and his keys work very well for our plants. Most Dichanthelium taxa ("Dichs") do not grow everywhere indiscrimminately, but prefer certain well-defined habitats. Note that most species produce flowers/fruits twice a year -- a vernal period and an autumnal period -- and that measurements of spikelets and achenes are taken from vernal plants. Some species also have a third, or summer, period. In the vernal period there is a single inflorescence at the tip of the stem. In the autumnal period, plants produce elongate branches with bunched (congested) leaves and so look very different from vernal plants--inflorescences are produced in leaf axils as well as at the tips of branches. NOTE: Older texts had these species essentially all within the very large genus Panicum. "Dich" species are typically named as "Witchgrass" and Panicum species named as "Panicgrass". | |
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| State Rank | [S1] | |
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