Coelorachis cylindrica
Coelorachis tessellata
Carolina jointgrass, cylinder jointtail grass
checkered jointtail grass, pitted jointgrass
60-120 cm, terete.
80-120 cm, compressed4ceeled.
terete;
ligules 0.2-0.8 mm.
compressed-keeled;
blades to 41 cm long, to 7.8 mm wide, folded to flat, scabrous above.
about 2.2 mm.
6.5-12.5 cm, often purple.
4.5-7(12) cm.
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 3.9-6.2 mm long, 2.1-2.4 mm wide;
lower glumes with rectangular pits, keels narrowly winged distally.
spikelets 1-2 mm.
spikelets 2.3-2.7 mm, reduced to scales.
= 18.
= unknown.
Coelorachis cylindrica
Coelorachis tessellata
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 tessellata is endemic to the southern coastal plain of the United States, extending from Louisiana to northern Florida, although it is rare in Florida. It grows in bogs and moist pine woods, especially flatwoods.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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