2. Arenaria L.
About 210
species, North America, South America, Europe, Asia, introduced nearly
worldwide.
The present
treatment follows that of McNeill (1962) in segregating Minuartia and Moehringia
from Arenaria, rather than the broad, inclusive concept of Arenaria
often followed by some American authors (Steyermark, 1963; Wofford, 1981).