Vascular Plants of North Carolina
Account for Dallis-grass - Paspalum dilatatum   Poiret
Members of Paspalum with account distribution info or public map:
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Section 5 » Order Cyperales » Family Poaceae
AuthorPoiret
DistributionThroughout the state; no doubt in every county.

Native of South America; in N.A. in the southern U.S. north to OR, OK, MO, and MD.
AbundanceCommon throughout the Coastal Plain and Piedmont, uncommon in the Mountains.
HabitatDry to moist roadsides, fields, meadows, clearings, disturbed ground.
PhenologyFlowering and fruiting May-November.
IdentificationDallis-grass is a familiar field/pasture weed and is one of the few in the genus with long-hairy spikelets. P. urvillei also has hairy spikelets, but that species is taller and has 10-30 inflorescence branches (vs. 2-7 such branches in P. dilatatum).
Taxonomic CommentsPaspalum is a genus of more than 300 species, found mostly in the New World. The genus is quite easily identified by the neat row of spikelets along each side of a flattened rachis (inflorescence branch), and also by the hemispherical outline of each spikelet. In some species there are only 2 such inflorescence branches, paired at the stem summit; in most of our species there are 3-4 branches; and in a few there may be many. Keys ask whether spikelets are paired or not -- that is, at each node on each side of the rachis there are pairs of spikelets on tiny stalklets. Care must be taken with a hand lens to make sure there are 2 stalklets at each node, as frequently one of the two spikelets will not grow. Non-paired or single spikelets will clearly have only a single stalklet per node.
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State RankSE
Global RankGNR
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