Iris prismatica Pursh ex Ker Gawl.
Coastal iris, Slender blue flag, Slender blue iris
Iridaceae (Iris Family)
Synonym(s): Iris carolina, Iris prismatica var. austrina
USDA Symbol: irpr
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.
From the Image Gallery
Bloom InformationBloom Color: Blue
Bloom Time: May , Jun , Jul
DistributionUSA: CT , DE , GA , MA , MD , ME , NC , NH , NJ , NY , PA , RI , SC , TN , VA , VT
Native Distribution: Coastal areas from N.S. to GA; also s. Appalacians
Native Habitat: Brackish to fresh swamps & meadows near the coast
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
From the National Suppliers DirectoryAccording to the inventory provided by Associate Suppliers, this plant is available at the following locations:
Edge of the Woods Native Plant Nursery - Orefield, PA
Toadshade Wildflower Farm - Frenchtown, NJ
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Mt. Cuba Center - Hockessin, DE
Recommended Species Lists
Find native plant species by state. Each list contains commercially available species suitable for gardens and planned landscapes. Once you have selected a collection, you can browse the collection or search within it using the combination search.View Recommended Species page
Additional resourcesUSDA: Find Iris prismatica in USDA Plants
FNA: Find Iris prismatica in the Flora of North America (if available)
Google: Search Google for Iris prismatica
MetadataRecord Modified: 2007-01-01
Research By: TWC Staff