(Spec) Iris setosa variety interior (Anderson) Hulten
( Edgar Anderson
, 1936) Originally described by Anderson in . The variety of Iris setosa
Pallas that occurs East of the Alaska range across Canada almost to the coast. Synonym Iris interior
Anderson. Not to be confused with Iris hookeri which has a synoym Iris setosa
Anderson's comments in 1936 read:
Iris setosa Pall. var. interior, var. nov. Ab specie bracteis scariaceis vel crasse chartaceis non foliaceis rubicundiusculis saepe minoribus quam pedicellis differt.
Bracts scarious to thickly chartaceous, not foliaceous, somewhat florid, often exceeded by the pedicels. Upper Yukon valley of Alaska, merging into the type in the lower valley and along the western coast.
Alaska: Fort Gibbon, frequent throughout the Yukon and Tanana valleys in lakes and along small streams, July 4, 1905, Heideman 62 (US type) ; same locality, Aug. 10, 1905, Heideman 98 (US) ; well-drained gully, Tolstoi, July 4, 1917, Harrington 37 (US); Rampart, July 24, 1901 [fruit], Jones 63 (US); alt. 150 m., vicinity of Fairbanks, Aug. 31, 1928 [fruit], Mexia 2302 (MBG) ; Fairbanks, July 25, 1931, Anderson 1221 (US) ; Fairbanks, June, 1927, Palmer 1783 (US).
The characters which distinguish Iris setosa var. interior from the type have been found to characterize all the available herbarium material from interior Alaska. Transitional forms are to be found in the region where this great interior valley meets the coast. The following specimens represent such transitional forms : Alaska: Ft. St. Michaels, Norton Sound, 1865-66, Bannister s.n. (US); moist grassy places, shade of alders, 16 miles west of Nome City, Aug. 5, 1900 [fruit], Flett 1560 (US) ; on the Yukon River, between Andreafski and Anvik, July 16-18, 1889, Russell s.n. (US).
According to glacial geologists, 3 this large region remained unglaciated during the Pleistocene, and there, if anywhere, we might hope to find living irises most similar to those Iris setosa which must in preglacial times have extended across northern North America. A number of facts have been found which support this hypothesis and they are discussed below (p. 480). While the irises of coastal Alaska are probably not varietally distinct from the type 4 (which is from Asia) there are minor geographical differences to be noted, when one compiles careful averages for such regions as the Arctic coast, the Alaskan Peninsula and Aleutian Islands, and the southern Alaskan coast. Such averages have been prepared from all the available herbarium material and the results are presented graphically, to scale, in fig. 1, along with similar averages for Iris setosa var. canadensis and Iris setosa var. interior.
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