| Callitriche stenoptera Lansdown | |
| Publ. & Syn. | Lansdown, Novon 19: 367 (2009). Holotype (MO-3834806): U.S.A.: Arizona, "Apache Co., Mexican Hay Lake, 6 mi. S of AZ 260 along AZ 273 on the N side of the rd.", 22. Sept. 1984, leg. J. Ricketson 2106. |
| Notes | Lansdown (2009) reported this new species from one collection from western Alaska: "Kotzebue-Kobuk Lowland", 1960, without collector (UAM). Its closest relative among the northern species seems to be Callitriche hermaphroditica. |
| Chromosomes | 6 (2x, x = 3). - Europe (N, C), Russia, Canada, U.S.A., Greenland. - Numerous reports. Not included: A report of 2n = 12 (4x) from northeastern Asia (Probatova et al. in Tzvelev 1996b) needs confirmation. |
| Geography | North American: ALA. |
| Distribution | N = R E = R AW = r [ key ] |
| Parent taxon | Callitriche L. |
| PAF ID | 800702 |