Vascular Plants of North Carolina
Account for Longleaf Spikegrass - Chasmanthium sessiliflorum   (Poiret) Yates
Members of Chasmanthium with account distribution info or public map:
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Section 5 » Order Cyperales » Family Poaceae
Author(Poiret) Yates
DistributionScattered across most of the southern and eastern parts of the state, including the northern Outer Banks. Absent from most of the northwestern half of the state.

Southeastern VA to AR and OK, south to central FL and southeastern TX.
AbundanceUncommon in the southern half of the Piedmont and much of the Coastal Plain; rare in the southern Mountains, and apparently absent in the Sandhills. There are enough records for the species to be given a State Rank of S3, instead of just S2S3. This is a Watch List species, but perhaps is numerous and widespread enough, especially as a G5 taxon, to no longer need that status.
HabitatMesic to moist (to dry) hardwood or hardwood-pine slopes and flats; often in rather rich soil in diverse forests, especially over calcareous or mafic rock. Generally above the normal flood zones of nearby creeks and rivers.
PhenologyFlowering and fruiting July-October.
IdentificationThis species is very much like Slender Spikegrass (C. laxum), which see. The leaves, flowering stems, and inflorescences average longer, and spikelets average more florets (4-7 vs. 3-5 in C. laxum) -- thus giving Longleaf Spikegrass a different gestalt in the field. Always note the pubescent leaf sheaths!
Taxonomic CommentsA purportedly different taxon occurs on the Outer Banks. However, plants there show continuous variation in spikelet characters -- short and appressed to elongate and divergent. Until the website editors see published evidence of the new taxon, this website will maintain a single entity. Older references named this species as Uniola sessiflora.

Other Common Name(s)Longleaf Woodoats. As with several other members of the genus, most websites and references name it as "woodoats". However, in the Carolinas these species with spike-like inflorescences with small spikelets are usually named as "spikegrass" -- including by Weakley (2018) and also by NatureServe. This website follow these last two references.
State RankS2S3 [S3]
Global RankG5
State Status[W1]
US Status
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