| Family | Campanulaceae |
| Subfamily | Lobelioideae |
| Scientific name | Lobelia loochooensis Koidzumi |
| Synonyms | none |
| Common name | (Japanese common name) maruba-hatake-mushiro (マルバハタケムシロ, 丸葉畑筵 [meaning: round leaved farm yard mat weed]) |
| (English common name) none | |
| Distribution | (Japan) Kyushu (Amami Islands), Okinawa |
| (Other nations) none | |
| Habitat | Seaside, farm yard |
| Chromosomal number | unknown |
| Description | Plants creeping. Leaves 5-7mm long, evergreen. Flowers calyxs ca. 3mm long, white or pale blue corollas 8mm long, flowering in July to September. Fruits ca. 4mm long. Perennial plants. |
| Note | Rare species. |
| Lobelia loochooensis Koidzumi is a similar spesies with Lobelia quadrangularis R. Brown in Australia. See Lobelia quadrangularis R. Br.. |
| April 2008 at Koishikawa Botanical Garden |
April 2008 at Koishikawa Botanical Garden |
April 2008 at Koishikawa Botanical Garden |