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Iris tenax
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Toughleaf Iris
( Iris tenax )
Iris tenax
More Photos at CalPhotos
More Info at Jepson eFlora
Calflora
Click on blue squares to see occurrence records.
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4 Nurseries Carry This Plant
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About Toughleaf Iris (Iris tenax)
4 Nurseries Carry This Plant
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Iris tenax
is a species of Iris native to southwestern Washington and northwestern Oregon. It is known as the Tough-leaved Iris or Oregon Iris. It occurs along roadsides and in grasslands and forest openings at low to middle elevations. One subspecies is also known from northern California. Like most irises, it has large and showy flowers. The flowers bloom in mid to late spring and are usually lavender-blue to purple, but blooms in white, yellow, pink, and orchid shades are known to sometimes occur. The leaves are very slender for an iris, seldom over 5 millimeter broad; the plant is often mistaken for a type of grass when not in bloom. Its rhizomes spread slowly, causing the plant to grow in a tight clump.
Plant Description
Plant Type
Perennial herb
Size
0.8 - 1.5 ft tall
Form
Upright
Growth Rate
Moderate
Flower Color
Purple, Lavender, Blue
Flowering Season
Spring
Wildlife Supported
Butterflies & moths hosted ( 1
likely
* )
SHOW ALL
*
Verbena Bud Moth
Endothenia hebesana
Endothenia hebesana
Landscaping Information
Sun
Shade, Part Shade
Moisture
Low
Nurseries
Carried by 4
Ease of Care
Moderately Easy
Soil Description
Prefers sandy or loamy soils. Does not grow well in clay soils.
Common uses
Groundcovers, Deer Resistant
Natural Setting
Site Type
mixedevergreen s
Climate
Annual Precipitation: 16.8" - 82.1", Summer Precipitation: 0.26" - 2.39", Coldest Month: 38.4" - 48.9", Hottest Month: 64.0" - 71.6", Humidity: 0.67" - 20.97", Elevation: 3" - 5170"
Alternative Names
Common Names
: Oregon Iris, Tough-leaved Iris
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Toughleaf Iris
Iris tenax
Sources include:
Wikipedia
. All text shown in the "About" section of these pages is available under the
Creative Commons Attribution-ShareAlike License
. Plant observation data provided by the participants of the
California Consortia of Herbaria
, Sunset information provided by
Jepson Flora Project
. Propogation from seed information provided by the
Santa Barbara Botanical Garden
from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include
CalPhotos
,
Wikimedia Commons
, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include
Calflora
,
CNPS Manual of Vegetation Online
,
Jepson Flora Project
,
Las Pilitas
,
Theodore Payne
,
Tree of Life
,
The Xerces Society
, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from
PRISM Climate Group, Oregon State University
, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.
Links:
Jepson eFlora Taxon Page
CalPhotos
Wikipedia
Calflora
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