| Chamaesyce glyptosperma (Engelm.) Small, 1903 |
| Chamaesyce glyptosperma var. pubescens (Boiss.) Millsp., 1913 |
| Chamaesyce golondrina (L.C. Wheeler) Shinners, 1949 |
| Chamaesyce gooddingii Millsp., 1916 |
| Chamaesyce gracillima (S. Watson) Millsp., 1916 |
| Chamaesyce grammata McVaugh, 1993 |
| Chamaesyce greenei (Millsp.) Rydb., 1917 |
| Chamaesyce grisea (Engelm. ex Boiss.) Millsp., 1916 |
| Chamaesyce hartwegiana (Boiss.) Small, 1913 |
| Chamaesyce heraldiana Millsp., 1916 |
| Chamaesyce hirsuta (Torr.) Arthur, 1911 |
| Chamaesyce hirta (L.) Millsp., 1909 |
| Chamaesyce hirtula (Engelm. ex S. Watson) Millsp., 1916 |
| Chamaesyce hypericifolia (L.) Millsp., 1909 |
| Chamaesyce hyssopifolia (L.) Small, 1905 |
| Chamaesyce incerta (Brandegee) Millsp., 1916 |
| Chamaesyce indivisa (Engelm.) Millsp., 1914 |
| Chamaesyce ingallsii Small, 1903 |
| Chamaesyce interaxillaris (Fernald) Millsp., 1916 |
| Chamaesyce intermixta S. Watson, 1889 |