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Bransford, W.D. and Dolphia
Iris prismatica Pursh ex Ker-Gawl.
Coastal iris, Slender blue flag, Slender blue iris
USDA Symbol: irpr
USDA Native Status: Native to U.S.
Thin, grass-like leaves rise from a basal cluster to 1-3 ft. The typically iris-like blossom, occuring on a branched stem, is blue.
A member of the iris family (family Iridaceae) which consists of herbs growing from rhizomes, bulbs, or corms, with narrow basal leaves and showy clusters at the tips of long stalks. There are about 60 genera and 1,500 species, distributed in temperate and tropical regions. Among them, Iris, Freesia, Gladiolus, Bugle Lily, and Montbretia are popular ornamentals. Saffron dye is obtained from Crocus, and essence of violets, used in perfumes, is extracted from the rhizomes of Iris.
Plant CharacteristicsDuration: Perennial Habit: Herb Fruit:
Green, Brown Size Class:
Bloom InformationBloom Color: Blue
Bloom Time: May , Jun , Jul
CT , DE , GA , MA , MD , ME , NC , NH , NJ , NY , PA , RI , SC , TN , VA , VT Canada: NS Native Distribution:
Coastal areas from N.S. to GA; also s. Appalacians Native Habitat:
Brackish to fresh swamps & meadows near the coast USDA Native Status: L48(N), CAN(I)
Growing ConditionsLight Requirement: Part Shade
Soil Moisture: Moist
Soil Description: Moist, acid soil.
Conditions Comments: Will tolerate high pH soils.
BenefitWarning: POISONOUS PARTS: Rhizomes (thickened roots) and rootstocks, fresh or dry. Minor skin irritation when touched, low toxicity if ingested. Symptoms include nausea, vomiting, abdominal pain, diarrhea, elevated temperature following ingestion; skin irritation upon contact with seeds, rootstock, or cell sap. Toxic Principle: Irisin, iridin, or irisine. (Poisonous Plants of N.C.)
PropagationDescription: Sow seeds outside as soon as they are ripe. Seedlings will germinate in one year and flower in two. Propagation is also accomplished by division.
Seed Collection: Not Available
Seed Treatment: Not Available
Commercially Avail: yes
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Record Modified: 2007-01-01
Research By: TWC Staff