Curtis's Botanical Magazine, Table 8844, 1920
"The handsome Iris here figured is a native of Turkestan, for the introduction of which horticulture is indebted to Mr. C. G. van Tubergen, the younger. Its earliest appearance in cultivation in this country dates from 1913, in which year rhizomes reached the garden of Mr. W. R. Dykes at Godalming, where it flowered for the first time in 1916, and whence the material for the present plate was contributed by Mr. Dykes in May, 1919. When describing the species on the occasion of its first making blossom, Mr. Dykes pointed out that it is a member of the section Regeliana, in foliage closely resembling I. Korolkowii, Reg., from Turkestan (figured at t. 7025 of this work), and I. stolonifera, Maxim., from Kokan, two well-known species of the same group, with rootstocks that spread even more rapidly by stolons than the former, though hardly to be distinguished, when in dormant condition, from the latter. This new Iris Mr. Dykes has dedicated to the Messrs. Hoog, nephews of its introducer, and now the heads of the famous establishment at Haarlem whence it was received by him. Like other members of the same section as I. Hoogiana, Mr. Dykes finds that its rhizomes, if they are to remain firm and plump, should not be taken up before the middle of July. One of the more pronounced features of this Iris is the uniform coloring of all parts of the flower, with the exception of the rich golden-yellow beard. The general color is lavender in the fully opened flower, though the shade appears to vary slightly, and in his original account of the plant Mr. Dykes states, on the authority of Mr. Hoog, that white flowered specimens occur in the original stock.<br /> Description.
-Herb with the rhizome emitting numerous stolons which are often of considerable length. Leaves ensate, slightly curved, somewhat blunt, 14-18 in. long, up to ¾ in. wide, glaucous green, smooth. Stem about 20 in. high, 2-3-flowered at the top. Spathes herbaceous, green except at the tip and along the upper portion of the membranous margin where they are flushed with purple, sharply keeled, 2 ½-3 ½ in. Pedicels very short. Perianth-tube green, streaked with purple, about 1 ¼ in. long, reaching the top of the spathe; outer segments with a reflexed rounded-obovate quite blunt, uniformly clear lavender-violet limb, 1 ¾ in. long, 1 ½ in. wide, and with a wide cuneate claw 1 ¼ in. long, of a pale lavender, indistinctly veined at the sides, beard copious, golden yellow, extending almost for 1 ½ in. somewhat beyond the claw on to the limb, where it becomes thinner and ends abruptly; inner segments erect, with an obovate somewhat acute limb gradually narrowed downwards to a short rather narrow claw, including the claw over 3 in. long, 1 ½ in. wide, uniform in color with the outer segments, beard scanty, golden yellow, extending about 1 in. Anthers slightly longer than the filaments, pale in color, with whitish pollen. Ovary oblong, 1-1 ½ in. long; style-arms wide-oblong, lavender; crests with broadly semi-ovate, almost entire lobes. Capsule elongated, narrowed to the tip Seeds pyriform, brown, rugulose, with a conspicuous whitish aril."
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