Vascular Plants of North Carolina
Account for Flattop Mille-graines - Oldenlandia corymbosa   L.
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Section 6 » Order Rubiales » Family Rubiaceae
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DistributionWidely scattered in 7 counties. No doubt other populations exist. First discovered in NC by O.M. Freeman in 1956, NW of Tryon, Polk Co. Recently collected in Duplin (2003), Mecklenburg (2017), Currituck (2018), and Moore (2020) counties. Weakley (2018) also mentions a report by Nesom (2000) from Orange County and B. England reports it from Wake Co (several locations from 2014 forward).

Native of South America; in N.A. VA to FL, TX, and AR.
AbundanceRare. Seems to be spreading in SC and NC, according to verbal communications by various botanists.
HabitatSeasonally wet hardpan forest (Mecklenburg Co.), garden weed (Duplin Co.), sandy roadside (Currituck Co.), cultivated land (Polk Co.), gravel driveway (Moore Co.).
PhenologyFlowering and fruiting July-October.
IdentificationThis plant is slender, the stems up to a foot or more tall and widely branching. In unfavorable situations, plants are less than 6 inches long and +- prostrate. The leaves are opposite and vary from linear to lance-shaped. The flowers occur singly or a few together in upper axils, tiny, white, with 4 pointed petals. The flowers are on quite long pedicels.
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State RankSE
Global RankGNR
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B.A. SorrieIn gravel driveway, Whispering Pines, NC, August 2020. MooreOther_non_natural
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