Ceratopteris thalictroides
Ceratopteris thalictroides (L.) Brongniart, Swamp Fern, is reported to have been common in taro patches on Kaua'i and O'ahu in 1907, although the first collection of it was not made until 1919 (Forbes 2530.O, BISH) (Lloyd 1973) . It became widespread on O'ahu and Kaua'i, but by 1973, because of intensive weeding and reduction in the number of taro patches, its distribution had become more limited. It has never been reported from any of the other islands even though taro is cultivated on them. Lloyd, in a study of the sexual and vegetative reproduction of C. thalictroides in Hawai'i, expected that it would be soon eliminated from the Hawaiian flora (Lloyd 1973) . Recent reports indicate that it is still extant in taro fields in Hanalei and Hanapepe on the island of Kaua'i (Flynn pers. comm.).
