Vascular Plants of North Carolina
Account for One-flower Sandwort - Mononeuria uniflora   (Walter) Dillenberger & Kadereit
Members of Caryophyllaceae:
Members of Mononeuria with account distribution info or public map:
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Section 6 » Family Caryophyllaceae
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Author(Walter) Dillenberger & Kadereit
DistributionWidely scattered in the southern Piedmont and southern Mountains. A specimen from Wake County is not verified at NCU herbarium, and with M. glabra being numerous there, the website editors choose not to map that as valid. Ranges north to Rowan and Burke counties.

This is a Southern species, ranging north only to southwestern NC and then south to central GA and central AL. It does not reach VA or TN.
AbundanceRare to locally uncommon, and restricted to rock outcrops, and thus quite limited on the landscape. It is a State Endangered species. There may be enough records to push the State Rank more toward S2, but the website editors will leave the NCNHP's rank of S1 as is, for now.
HabitatThis species is limited to granitic outcrops, almost always on flat (flatrocks) or rounded ones (domes). It grows in the thin soil along margins of the outcrops.
See also Habitat Account for Flatrocks
PhenologyBlooms in April and May, and fruits soon after flowering.
IdentificationThis is a slender herb that grows erectly or leaning, but only to about 6 inches tall at best. It is quite similar to M. glabra, but this species has much shorter stem leaves, each pair being only 2-5 mm (about 1/8-inch) long, as compared with 10-30 mm (about 3/4-inch) long in M. glabra. Also, the upper stem leaves are often oblong or lanceolate and generally are not linear, as opposed to narrowly linear leaves in M. glabra. The several flowers at the tips of branches have 5 white petals, as in others in the genus, but these are rather small and normally less than 1/3-inch across. Thus, the visual aspect of this species is of short plants in clusters that are not overly slender owing to the broader but shorter leaves; M. glabra is more slender looking owing to the very narrow leaves. Thankfully, the ranges of these two do not, or barely do, overlap in the state.
Taxonomic CommentsThe Mononeuria species were formerly named as Arenaria species, and then as Minuartia. NatureServe still names this as Minuartia uniflora, but Weakley (2018) uses Mononeuria.

Other Common Name(s)One-flower Stitchwort, Single-flower Sandwort, Piedmont Sandwort
State RankS1
Global RankG4
State StatusE
US Status
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B.A. SorrieAnson County, 2009, Flatrock Church Outcrop. AnsonPhoto_natural
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