■ (SPEC) Iris thompsonii R. C. Foster
1937, Botanical author Robert C. Foster
Iris thompsonii R. C. Foster
(Robert C. Foster
, 1937). Series Californicae
. Flower color is typically purple, but varies among other colors, including white, cream, gray, blue, red and lavender. The perianth tube is longer than in I. douglasiana
or I. innominata
. Plants are small, evergreen, with narrow leaves. There are one to two flowers per stem.
Long thought to be a natural hybrid between Iris douglasiana
and Iris innominata
, this purple flowered species was recognized as a separate species initally by R.C. Foster, then subsumed into Iris innominata
as a purple-flowered form by L. Lenz. In 1990, Wilson et al completed chromatography studies on all three species and concluded it is a valid species in on its own.
is found south of Powers, Oregon in Coos County, southward into northern Del Norte County, California. It grows on open, lightly wooded sites, with sunnier aspect than preferred by I. innominata,
and is well inland from the coastal areas preferred by I. douglasiana
. Soil preference appears to be transitional between serpentines and non-serpentine soils in this region.
| Foster in Rhodora 1937
| Wilson et al, 1990. Madrono 37:113.
No hybrids registered
Distribution and Cultivation
| Distribution: The distribution of the species gives clues as to its cultural requirements, although plants in cultivation can often tolerate a wider range of variables: The species is found in the following region:Bonap's North American Plant Atlas shows the following map reproduced by permission of Kartesz, J.T., The Biota of North America Program (BONAP). 2015. Taxonomic Data Center. (http://www.bonap.net/tdc). Chapel Hill, N.C. [maps generated from Kartesz, J.T. 2015. Floristic Synthesis of North America, Version 1.0. Biota of North America Program (BONAP). (in press)]
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