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Iris odaesanensis
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Iris odaesanensis

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Iris odaesanensis

Iris odaesanensis is a beardless iris in the genus Iris, in the subgenus Limniris and in the series Chinenses of the genus. It is a rhizomatous herbaceous perennial from China and eastern Korea. It has blue-green grass-like leaves, short stem, 1 or 2 fragrant, white or off-white flowers in spring to early summer. It is a rare plant in the wild, but it is cultivated in east Asia.

Iris odaesanensis growth is more vigorous than Iris minutoaurea and Iris koreana.

It has small, slender rhizome measuring about 1 cm × 0.5 cm (0.39 in × 0.20 in), it spreads by growing many stolons or branches. Under the rhizome, are secondary roots growing into the soil, looking for nutrients. These roots have small nodules on them. These are used to fix nitrogen, from the soil.

It has glaucous (blue-green), grass-like leaves. They are sword-shaped (ending in a point),. and measure between 10–25 cm (4–10 in) long and 0.5–1.1 cm (0.20–0.43 in) wide. The leaves then elongate after flowering, up to 35 cm (13.8 in) long. It also has many midribs, along the length.

It has short, flowering stems (or scapes) 9–13 cm (3.5–5.1 in). It has one or two terminal (at the top of the stem) flower, in spring to early summer, between April or June.

It has 2 lanceolate (lance-like) 3.3–6.2 cm (1.3–2.4 in) long and 0.1–0.4 cm (0.039–0.157 in) wide, spathes (leaves of the flower bud).

The small fragrant, flowers are 3–4 cm (1–2 in) in diameter, and white or off-white.

It has 2 pairs of petals, 3 large sepals (outer petals), known as the 'falls' and 3 inner, smaller petals (or tepals, known as the 'standards'. The falls are obovate (egg-like), 1.8–2.4 cm (0.71–0.94 in) long and 1–1.6 cm (0.39–0.63 in) wide, with a central yellow signal patch, spreading towards the centre of the flower.

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