水麦冬 shui mai dong

Abbotia palustris (Linnaeus) Rafinesque; Juncago palustris (Linnaeus) Moench; Tristemon palustris (Linnaeus) Rafinesque.

Herbs, perennial, ± slender; rhizome short, clothed with sheaths of old leaves. Leaves ca. 20 cm × 1 mm. Scape erect, slender; racemes with ± laxly arranged flowers. Flowers on short pedicels 2(-4) mm, scarcely elongating after anthesis; perianth segments purplish green, elliptic, 2-2.5 mm. Carpels only 3 fertile. Fruit closely appressed to scape, clavate, 6-7(-10) × ca. 1.5 mm, gradually tapering at base, ascending. Fl. and fr. Jun-Oct. 2n = 24, 28.

Marshes, streamsides, wet meadows; below 4500 m. Chongqing (Chengkou), Gansu, Hebei, Heilongjiang, Nei Mongol, Ningxia, Qinghai, Shandong, Xinjiang, Xizang [Afghanistan, Bhutan, India (Sikkim), Japan, Kazakhstan, Korea, Kyrgyzstan, Mongolia, Nepal, Pakistan, Russia, Tajikistan, Turkmenistan, Uzbekistan; cosmopolitan in temperate regions].