Callitriche petriei R.Mason
starwort
Monoecious or dioecious herb of wet ground with creeping unbranched stems ascending 3-7 cm, less often aquatic with submerged stems to 20 cm or more long, without definite rosettes. Terrestrial lvs (1)-2.2-(8) mm long, thin, spathulate or obovoid to suborbicular, entire, 3-5-nerved; submerged lvs slightly longer and linear or linear-spathulate, 1-nerved. Fls usually solitary in 1 lf axil of each pair, ebracteolate. Filaments 2-4 mm long; Style 1.7-2.2 mm long, ± persistent. Fr. 0.6-0.9 × 0.7-1.1 mm, suborbicular and broader than long; wing 0; faces strongly convex; commissural groove shallow and narrow.
N.; S.: scattered from 37°-46° 30' S, but apparently absent between 42° and 45° ( subsp. petriei); Ch. ( subsp. chathamensis R. Mason).
Endemic.
Wet ground beside streams, ponds and lakes.
FL Dec-Feb.
