Vascular Plants of North Carolina
Account for Awned Mountain-mint - Pycnanthemum setosum   Nuttall
Members of Lamiaceae:
Members of Pycnanthemum with account distribution info or public map:
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Section 6 » Order Lamiales » Family Lamiaceae
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DistributionScattered in the Coastal Plain (only), concentrated mostly in the northern portion near the VA line, and also in the far southern counties. A handful of other records, near the coast.

This species is limited to the lower Coastal Plain, from NJ to northern FL, and barely west to MS. It is a relatively scarce species. Not only is it scarce, but there seems to be conflicting information about it among references.
AbundanceRare to perhaps locally uncommon. This is a Significantly Rare species, and the NCNHP gives it a State Rank of S2.
HabitatThere is quite conflicting information about habitats in NC. NCNHP's rare plant list says "blackwater swamps"; yet, Weakley (2018) says "Dry pinelands"! Most references say it occurs in pine flatwoods, wet pine savannas, ditches, and openings in bottomlands and swamps. At any rate, it appears to be a wetland species.
PhenologyBlooms rather early for the genus, from mid-June to August, and fruits from August to October.
IdentificationThis species is a typical mountain-mint, being about 2-3 feet tall, freely branched in the upper portions of the stem, and with numerous pairs of opposite leaves. The leaves tend to be ovate, nearly sessile, toothed along the margin, and about 2-3 inches long and half as wide. These species have rather flat-topped heads of about 1-2 inches wide at the ends of each branch, subtended by bracts, with the flowers being very small and generally white with some purple spots on the lower lip. This species has somewhat fewer heads in bloom over the plant than most others, though they are scattered and not close together in a flat-topped inflorescence as in P. flexuosum. It has wider leaves than that common species, also. From P. muticum, it can be separated by calyx lobes that are attenuated into a subulate (extremely narrow) tip, versus calyx lobes triangular to acute but not subulate; this may require a hand lens to see well. To find this species, you may have to use your hand lens and be prepared to collect a plant or at least a few twigs.
Taxonomic CommentsNone

Other Common Name(s)None
State RankS2
Global RankG4
State StatusSR-T
US Status
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