$modus 0: smartphone
$modus 1: smartphone
Ptilimnium costatum
Ptilimnium costatum (Elliott) Raf. [Accepted]
Umbelliferae
Ptilimnium costatum test 17 (Elliott) Raf.
D.S. Correll, H.B. Correll, Aquatic Wetl. Pl. SW U.S.: , fig. 591 (1972) [V. Frazier]