| Chamaesyce barberoana Croizat, 1943 |
| Chamaesyce barbicarina Millsp., 1916 |
| Chamaesyce bartolomaei (Greene) Millsp., 1916 |
| Chamaesyce berteroana (Balb. ex Spreng.) Millsp., 1909 |
| Chamaesyce biramensis (Urb.) Alain, 1952 |
| Chamaesyce blodgettii (Engelm. ex Hitchc.) Small, 1903 |
| Chamaesyce bombensis (Jacq.) Dugand, 1968 |
| Chamaesyce brandegeei (Millsp.) Millsp., 1916 |
| Chamaesyce buxifolia (Lam.) Small, 1903 |
| Chamaesyce capitellata (Engelm.) Millsp., 1916 |
| Chamaesyce carmenensis (Rose) Millsp., 1916 |
| Chamaesyce carunculata (Waterf.) Shinners, 1952 |
| Chamaesyce chaetocalyx (Boiss.) Wooton & Standl., 1913 |
| Chamaesyce chaetocalyx var. triligulata (L.C. Wheeler) Mayfield, 1993 |
| Chamaesyce chalicophila (Weath.) Millsp., 1916 |
| Chamaesyce chamaecaula (Weath.) Millsp., 1916 |
| Chamaesyce cinerascens (Engelm.) Small, 1903 |
| Chamaesyce conjuncta (Millsp.) Millsp., 1916 |
| Chamaesyce consanguinea (Millsp.) Lunell, 1910 |
| Chamaesyce cozumelensis (Millsp.) Millsp., 1916 |