Abstract
This review recognizes 41 spp. of Arenaria to occur in N. America north of Mexico. Keys, name-bringing and pertinent synonomy and general statements of distr. and habitat, are provided for all spp. and subspp. New are: Arenaria muriculata, Arkansas; A. congesta var. glandulifera Idaho; A. pusilla var. diffusa, Calif.; A. rossii var. apetala, Montana and Wyoming; and A. hookeri var. desertorum, Utah. A. chamissonis (A. dicranoides (Cham. and Schlecht.) Hult., preoc.) is proposed and the new combs.; A. lanuginosa ssp. saxosa (A. s. Gray), A. patula var. robusta (A. p. f. r. Steyerm.), A. stricta ssp. texana (A. s. var. t. Robins.). A. s. ssp. dawsonensis (A. d. Britt.), and A. s. ssp. macra (A. m. Nels. and Macbr.).

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