Coelorachis cylindrica
Coelorachis rugosa
Carolina jointgrass, cylinder jointtail grass
wrinkled jointgrass, wrinkled jointtail grass
60-120 cm, terete.
60-120 cm, compressed-keeled.
terete;
ligules 0.2-0.8 mm.
compressed-keeled;
ligules 0.5-1 mm.
about 2.2 mm.
about 2 mm, broadly ellipsoid.
6.5-12.5 cm, often purple.
3-9.5 cm;
rachises distinctly indented adjacent to the sessile spikelets.
spikelets 5-5.5 mm;
lower glumes with circular pits on the sides, the central region initially smooth, usually developing rectangular pits at maturity, occasionally remaining smooth;
upper lemmas and paleas 4-4.5 mm.
spikelets 3-4 mm;
lower glumes transversely rugose;
upper lemmas and paleas 2-3 mm.
spikelets 1-2 mm.
spikelets 1-3 mm.
= 18.
= unknown.
Coelorachis cylindrica
Coelorachis rugosa
Coelorachis cylindrica is native to the southeastern United States, where it grows in tallgrass prairies, the edges of forests, and roadsides. The specimen from Michigan was found in an old field, in association with many native species. Its source is unknown.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Coelorachis rugosa is endemic to the southeastern United States. It grows in moist to wet areas in prairies, bogs, and pine woods, especially flatwoods and savannahs.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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