Donn ex Hornem.
Iris sanguinea is a rhizomatous flowering plant in the genus Iris and in the Iris series Sibiricae. It is cultivated as an ornamental plant in temperate regions. It is one of the species considered a Japanese iris. It is from Asia, found between Russia, Mongolia, China, Japan and Korea. It has grey green leaves, an unbranched flowering stem and flowers in reddish-purple shades, from blue to blue-purple, red-violet, with a rare white variant.
It has a thick creeping rhizome.
It has grey-green leaves that are more or less the same height as the flowering stems, but as the leaves droop, they appear shorter. The linear, narrow leaves grow between 20–60 cm long and 5-13mm wide.
It has a hollow unbranched flowering stem, that grows up to between 30 and 90 cm (12–36 inches) long. The stems bear two to three flowers, at the terminal ends in early summer, between May and July.
The flowers come in a range of reddish-purple shades, from blue to blue-purple, red-violet, with a rare white variants. The flowers are 6–8 cm in diameter.
It has two pairs of petals, three large sepals (outer petals), known as the 'falls' and three inner, smaller petals (or tepals, known as the 'standards'). The large obovate (shaped like an egg), drooping 'falls' have reddish-purple veins on a white or yellowish signal. The smaller, erect obovate standards are 4–5 cm long and 1.5 cm wide.
It has perianth tube of 8–10 mm long, 3 cm long white filaments, yellow anthers, a cylindric ovary 1.5–2 cm long by 3–4 mm wide, and a reddish-purple style branches 3.5 cm long by 5 mm wide.
In 2012, a genetic study was carried out on Iris laevigata and several of its closely related iris species, including Iris ensata, Iris setosa, Iris halophila, Iris scariosa, Iris potaninii, Iris tenuifolia, Iris bloudowii, and Iris sanguinea. 
As most irises are diploid, having two sets of chromosomes, this can be used to identify hybrids and classification of groupings. It has been count various times; 2n=28, Simonet, 1928; 2n=26,28 Lee, 1970; 2n=28, Starodubtsev & Mironova, 1990; 2n=28, Huang, S.-f. & Zhao, 1995. 2n=28 is the most common listed count. This means it is similar to Iris sibirica and Iris typhifolia.
Iris sanguinea is pronounced as EYE-ris san-GWIN-ee-a.
It was originally published as Iris orientalis by Thunberg in Transactions of the Linnaean Society Vol. 2 page 328 in 1794, but the name had already been used for an iris within the series Spuriae Iris.
It was first published as Iris sanguinea, described by Jens Wilken Hornemann in Hortus Regius Botanicus Hafniensis (In Usum Tyronum et Botanophilorum. Hauniae) (Copenhagen) issue 58 in 1813. But this was based on an earlier description by James Donn in 'Hortus Cantabrigensis.' Vol. 6, 17 in 1811.
Distribution and habitat
It is found between Russia (East of Lake Baikal in Siberia, Buryatia, Chita, Irkutsk, Amur, Khabarovsk, Magadan and Primorye), Mongolia, China (provinces of Heilongjiang, Jiangsu, Jilin, Liaoning and Nei Monggol), Japan (Hokkaido, Honshu and Shikoku) and Korea.
It will tolerate temperatures of −3.8 °C (25 °F) down to −34.4 °C (-30 °F). It is hardy to USDA Zone 4-9, and Zone H2 (which means hardy to -15 to −20 °C (5 to -4 °F ), in Europe. It is hardy in the UK, but will not survive wet winters in cooler parts of the world.
The plant needs moisture during the growing season (in spring and early summer) to create the best blooms. But they don't grow in the water, although they will tolerate occasional flooding.
They are best propagated by division. The divisions must be not be allowed to dry out and can be temporarily stored in bucket of water, while the new planting position is prepared. The best time to divide plants is between August and September.
To grow from seed, allow the mature pods to dry on the plant. Then break open to collect seeds and the direct sow outdoors in fall or autumn. The seed should germinate within three months, if they have been pre-chilled for four weeks or placed outdoors over winter. Once germinated they should be brought indoors (or place in a cold frame) to avoid temperature shock and then transplant outside, when the plant has four leaves. The climatic conditions of the garden, controls planting (or transplanting) times. In the north, they are best planted in the spring (avoiding frost damage to tender roots). In the south, they are best planted in the autumn (or fall), which avoids the hot dry period.
They can be used in gardens, at waterside locations beside pools, ponds or streams.
It is naturally propagated by pollinating insects such as bees which will feed on its nectar.
Hybrids and cultivars
Iris sanguinea crosses:
- Iris sanguinea and Iris sibirica; 'Abitibi'; 'Chaudiere'; 'Gatineau'; 'Kootenay'; 'Madawaska'; 'Matane'; 'Ottawa'; 'Pembina'; 'Pickaninny'; 'Pickanock'; 'Richelieu'; 'Soothsayer'; 'Rideau'; 'Rimouski'
- Iris sanguinea and Iris chrysographes: 'Aegea';
- Iris sanguinea and Iris hookeri; 'Humble Path';
- Iris sanguinea and Iris setosa; 'Orientosa';
- Iris sanguinea and Series Californiae (Cal-Sibes); 'Crimson Accent';
- Iris sanguinea and Iris ensata; 'Adrenaline Rush';
- Iris sanguinea and Iris versicolor; 'Lillabelle';
It also has the following known cultivars; 'Annick'; 'Baby Sister'; 'Blue King'; 'Coreana'; 'Dreams'; 'Emperor'; 'Fairy Fingers'; 'Flossie Bobbsy'; 'Grace Ashley'; 'Haematophylla'; 'Kamayama';'Kobana'; 'La Blanchefleur'; 'Nana'; 'Nana Alba' (white flowers usually with some purple veins); 'Nertchinskia'; 'Orientalis Alba'.; Orientalis Alba Stellata'; 'Sanguinea 1615'; 'Sanguinea 1616'; 'Snowcrest'; 'Snow Queen'; 'Sorak Blue'; 'Tetrapetala'; 'Trigonocarpa'; 'Yankee Trader'; 'Yixingensis';
Like many other irises, most parts of the plant are poisonous or toxic (rhizome and leaves); if mistakenly ingested, it can cause stomach pains and vomiting. Also handling the plant may cause a skin irritation or an allergic reaction.
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