4. Aphanisma Nutt. ex Moq

Aphanisma Nutt. ex Moq. in DC., Prodr.13, 2: 43, 54 (1849)

Annual herb, glabrous. Flowers (1-)3-5 together, concealed in the axil of the bracts; perianth lobes 3, erect in fruit; stamen 1 or wanting; stigmas 3. Fruit compressed, 3-5 ridged, circumscissile in the lower third; seeds horizontal; embryo incompletely annular. One sp., A. blitoides Nutt. ex Moq., California.