Vascular Plants of North Carolina
Account for Clustered Bluet - Edrastima uniflora   (L.) Rafinesque
Members of Rubiaceae:
Only member of Edrastima in NC.
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Section 6 » Family Rubiaceae
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Author(L.) Rafinesque
DistributionThroughout the southern half of the Coastal Plain, but scattered in the northern portion; a disjunct record into the southern Piedmont (Union County).

This is a mainly Coastal Plain species, extending from Long Island, NY to southern FL and west to eastern TX.
AbundanceInfrequent and easily overlooked, in the Coastal Plain north to Moore, Johnston and Carteret counties; rare to locally uncommon north to the VA border. Extremely rare in the southern Piedmont. It is much more numerous than the NCNHP's S2S3, and the website editors recommend S3.
HabitatThis is a wetland species of many habitats. It occurs in ditches, shores of pools and ponds, especially in muddy drawdowns, and other damp ground.
PhenologyBlooms from August to October, and fruits shortly after flowering.
IdentificationThis is a very easily overlooked species, even when in bloom, as it grows well under a foot tall. It has a slender stem to about 10 inches tall, often leaning, with scattered opposite stem leaves. Each leaf is elliptical, about 2/3-inch long and about 1/3 as wide; the leaves and the stem are quite hairy/hispid. The flowers are mostly single in axils, or terminal on the stem, bell-shaped, but the 4 white petals have a spread of barely 1/6-inch across. Oldenlandia boscii is similar but has much narrower, linear leaves, about 1/10-inch wide, much longer than wide. Though hardly a scarce species, many biologists are not familiar with it, as it certainly does not draw attention by large or colorful flowers.
Taxonomic CommentsThis species was long placed in the genus Oldenlandia, as O. uniflora; some references still retain it there.

Other Common Name(s)Oldenlandia, Clustered Mille-graines
State RankS2S3 [S3]
Global RankG5
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B.A. SorrieSandhills Game Land, upper ecotone of streamhead, 1998. RichmondPhoto_natural
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