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Orchard Grass,
Dactylis glomerata
Membranous ligules, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
Downy Brome,
Bromus tectorum
Its ligules are 0.04-0.1 in. (1-2.5 mm) long, per www.invasive.org.
Poverty Brome,
Bromus sterilis
Leaf sheath pubescent; blade soft, 5-20cm x 4-10mm, pubescent; ligule 2-4mm, per Flora of China.
Smooth Brome,
Bromus inermis
Leaf wraps stem w a V-shaped notch; ligule < 0.15cm, brownish at the base, per Invasive Plants, Guide to Identification, Impacts and Control (Kaufman & Kaufman, 2007).
Hairy Woodland Brome,
Bromus pubescens
Summit of sheath opposite the ligule lacking a conspicuous tuft of hairs, per Weakley's Flora (2020).
Satin Brome,
Bromus nottowayanus
Summit of sheath opposite the ligule with a conspicuous tuft of hairs, per Weakley's Flora (2018).
Rescue Grass,
Bromus catharticus var. catharticus
Lf sheath pubescent; blade 30-40cm x 4-6mm, scattered pubescent; ligule ~2mm, per Flora of China.
Cheat,
Bromus secalinus
Leaf sheath usually glabrous; blade 5-15cm x 3-6mm, pubescent; ligule 1-2mm, per Flora of China.
Little Barley,
Hordeum pusillum
Ligules scarious (thin, dry, membranaceous, often more or less translucent), per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
Smut-grass,
Sporobolus indicus
Ligules less than 0.1mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
Slender Muhly,
Muhlenbergia tenuiflora
Ligule obsolete or shorter than the elongate cartilaginous summit of the leaf sheath, per Weakley's Flora (2023).
Nuttall's Reedgrass,
Greeneochloa coarctata
Node and ligule.
Reed Canarygrass,
Phalaris arundinacea
Reed Canarygrass has a distinctive transparent ligule, per Invasive Plants, Guide to Identification, Impacts and Control (Kaufman & Kaufman, 2007).
Dallis-grass,
Paspalum dilatatum ssp. dilatatum
Ligule membrane 2-3mm long, per Forest Plants of the Southeast and Their Wildlife Uses (Miller & Miller, 2005).
Dallis-grass,
Paspalum dilatatum ssp. dilatatum
Ligules of P. dilatatum (on left) vs. P. urvillei (on right).
Vasey Grass,
Paspalum urvillei
Ligule a long membrane, 4-8mm, w long hair tufts behind, collar often dark, per Forest Plants of the Southeast and Their Wildlife Uses (Miller & Miller, 2005).
Vasey Grass,
Paspalum urvillei
Ligules of P. dilatatum (on left) vs. P. urvillei (on right).
Switchgrass,
Panicum virgatum var. virgatum
Ligule ciliate or lacerate [torn, irregularly cleft or cut], 1-5mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
Woolly Witchgrass,
Dichanthelium acuminatum var. acuminatum
Ligules ciliate, 2-4mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
Velvet Witchgrass,
Dichanthelium scoparium
Ligules densely ciliate, 1.5-3mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
Gama Grass,
Tripsacum dactyloides var. dactyloides
Ligules ciliate, 2-4mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
Bachelor's Buttons,
Cyanus segetum
Flowers discoid, perfect, or the outer simulating ligules and sterile, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
Hairy Beggarticks,
Bidens alba var. radiata
Ray florets white, 5-8, the ligule 5-16 mm long, per Weakley's Flora.