Vascular Plants of North Carolina
Account for Bayard's Adder's-mouth - Malaxis bayardii   Fernald
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Section 5 » Order Orchidales » Family Orchidaceae
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DistributionThis is a poorly known species owing to its fairly recent split out from M. unifolia; the two species are quite similar in appearance as a result, and M. bayardii is likely overlooked. Thus the NC range of the species -- right now known only from the western Piedmont (foothills east to Rowan County) plus Buncombe and Watauga counties in the nearby mountains -- is certainly incomplete. The specimen(s) from Buncombe at Drexel University (PH) have not been examined by the website editors, though Weakley's (2018) map shows it as rare in the NC mountains.

This species is known only from East Coast states, ranging from MA and southeastern NY south to western NC. There are no records known from KY or TN, and most states within the range have only a few county occurrences.
AbundanceApparently very rare, as only a few records are known, one or two of which are many decades old. Note that there is confusion over the identifications even of specimens, and thus one or more of the specimen records might refer to M. unifolia. This is a Significantly Rare species, and whether it still exists in the state is uncertain.
HabitatThis is an upland species over its range. The very similar M. unifolia grows mostly in moist forests and bottomlands. The North American Orchid Conservation Center website say the habitat over its range is "dry woodlands, pine barrens, and especially favors sandy and shallow soils." These habitats probably refer mostly to sites in the northeastern Coastal Plain, but the one definitive NC specimen was from Blowing Rock Mountain in Caldwell County.
PhenologyThis species blooms mostly from July to September -- perhaps mostly July or August in NC, and fruits shortly thereafter. Its blooming period is generally one or two months later than that of M. unifolia where both might be present.
IdentificationAs expected, the identification of this species can be tricky, as M. unifolia is very similar. Each is a bright green to yellow-green plant overall; it grows to about 6-12 inches tall, with one large, broadly elliptic, entire leaf clasping the stem. The leaf is about 3-3.5 inches long, with a rounded tip. The inflorescence contains numerous very small green flowers, covering the top third to half of the stem. In this species, the flower stalk (pedicel) is short and only about 3-5 mm long, whereas M. unifolia has pedicels about 5-10 mm long. There are tiny characters on the flowers that are helpful to the experts. The main visual character may be a less dense inflorescence in this species, as compared with a dense clustering of flowers in M. unifolia, especially toward the tip of the stem. It may well be that the habitat of the orchid in question is the best separator in NC -- dry and upland forest in this species, versus moist ground -- boggy areas, bottomlands, and damp thickets, for M. unifolia.
Taxonomic CommentsMost references, at least until one or two decades ago, did not list this entity, even as a variety; it was simply sunk within M. unifolia. However, it is generally conceded to be a good, valid species by recent authorities.

Other Common Name(s)Appalachian Adder's-mouth
State RankS1
Global RankG1G2
State StatusSR-T
US Status
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