• Scientific Name: Hemerocallis middendorffii Trautv. & C.A.Mey.
• Ref: A.T.von Middendorff, Reise Sibir. 1(2; 3):94. 1856
• Synonym: Hemerocallis dumortieri subsp. middendorffii (Trautv. & C.A.Mey.) Vorosch.
• English Common Name: Amur daylily
• Chinese Common Name: 大苞萱草 dàbāo xuāncǎo, 大花萱草 dàhuā xuāncǎo
• Japanese Common Name: エゾゼンテイカ [蝦夷禅庭花] ezozenteika
• Family: Asphodelaceae
• Genus: Hemerocallis
• Distribution: Forests, forest margins, meadows, wet grasslands; near sea level to 2000 m. Heilongjiang, Jilin, Liaoning [Japan, Korea, Russia].
• Photo: Mt. Changbai, Jilin
• Note: Named for Alexander Theodor von Middendorff, misspelt as Hemerocallis middendorfii in FRPS Vol.14, 1980.

Plants 40--80 cm tall. Roots ropelike, 1.5--3 mm thick, slightly fleshy, sometimes fibrous, without a tuberous part. Leaves linear, 35--80 × 0.8--1.6 cm, base surrounded by fibrous remains of older leaves. Scape stout, hollow. Inflorescence subcapitate, 0.1--0.5 cm, densely 2- or 3(--6)-flowered; bracts green or slightly pink, ovate to ovate-lanceolate, large, 2--6 × 1--3 cm, apex catkinlike. Pedicel 1--3 mm. Flowers slightly fragrant. Perianth golden yellow or orange; tube 0.9--1.7 cm, enclosed by bracts for at least 1/3 its length; segments 6--7.5 cm, inner ones wider than outer, 1--2 cm wide. Filaments ca. 4.5 cm; anthers purplish black, yellow abaxially, ca. 5 mm. Capsule broadly ellipsoid, 1.5--2.3 × 1--1.4 cm. Fl. May--Jun. (Flora of China)