Vascular Plants of North Carolina
Account for Bosc's Bluet - Oldenlandia boscii   (de Candolle) Chapman
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Section 6 » Order Rubiales » Family Rubiaceae
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Author(de Candolle) Chapman
DistributionLimited to the southwestern Coastal Plain, from Scotland and Hoke counties southeast to Brunswick County.

This is a Southern species, ranging from southeastern VA and southern MO south to the FL Panhandle and central TX. Thus, this species could be found eventually in the central and northern Coastal Plain.
AbundanceVery rare to rare, and somewhat ephemeral, as it often is found in fluctuating waters of pools and Carolina bays. Though it is State Endangered, the NCNHP has a State Rank of S2. Their database has nine records, of which most are still extant, but the website editors feel that S1S2 is more realistic.
HabitatThis is a wetland species of stationary waters. It grows in drawdown mud and shores of various lakes, ponds, and pools, in clay-based Carolina bays, and rarely along muddy shores of moving waters. It can seemingly disappear for a few years if water levels are not appropriate.
PhenologyBlooms in August and September, and fruits shortly after flowering.
IdentificationThis is a quite insignificant-looking species, often leaning or flattened by water into a procumbent position, with a slender stem and slender leaves, as well. It grows to about 8-10" tall or long, with a number of pairs of opposite leaves, each linear to elliptic, about 3/4" long, and barely 1/10" wide. The very small flowers grow in leaf axils, rather bell-shaped but with 4 tiny white petals. It is most similar to Edrastima uniflora, which was formerly named as O. uniflora. That species also grows in bays and pool margins, but it is quite villous to hispid all over. Also, its leaves are somewhat ovate, about 2 times longer than wide. Weakley (2018) reminds readers that, in vegetative condition, it resembles the unrelated Polypremum procumbens, which normally grows away from water and wetlands, though it could in some situations. Few biologists seem to be familiar with O. boscii, as it is rare, and as it is easy to overlook owing to its wispy look and tiny axillary flowers.
Taxonomic CommentsNone

Other Common Name(s)Bosc's Mille-graines
State RankS2 [S1S2]
Global RankG5
State StatusE
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