(SPEC) 'Iberica Ochracea' 1863, Regel 'Iberica Ochracea' ( Eduard August Regel, 1863) Section Oncocyclus; Color Code Y (yellow). Original Diagnosis in Transaction...
(SPEC) 'Iberica Van Houtteii' 1872, Van Houtte 'Iberica Van Houtteii' (Louis Benoît Van Houtte, 1872), Section Oncocyclus. Van Houtte's form of Iris iberica; Krel...
■(SPEC) 'Ida' 1973, van Eeden ‘Ida’. (P. B. van Eeden, 1973). Section Hermodactyloides. Standards lobelia blue (RHS 91a,b), falls pale lobelia blue, veined green,...
(Spec) 'Igor' YYYY, Hybridizer/collector? 'Igor' (unregistered, ) Subgenus Scorpiris; Very bright white standards and style arms. Falls white with conspicuous cit...
(Spec) 'Iktomi' 1992, Duffy 'Iktomi' (Lawrence J. Duffy, R. 1992). Seedling #W1 7 72. SPEC, 36 41" (91 104 cm), Early bloom. Lavender blue with large white blotch...
(SPEC) 'Il Gengold 1980, Berlin 'Il Gengold' ( Eckard Berlin, R. 1979) Seedling #102 B Mitte. LAEV, 35" (90 cm). Midseason bloom. Standards light yellow; falls st...
(SPEC) 'Illina Watson' 1931, Watson 'Illina Watson' (J. H. watson, 1931) English Iris; Color code WW: 'Virginia' X 'L'Obscurite'. See below: * References Ref...
■ (SPEC) Iris illyrica Tommasini 1875, Tommasini 'Illyrica' (Mutius von Tommasini, 1875, Lago di Garda to northeast shores of the Adriatic). Dark blue self. Dykes...
(Spec) 'Imperatrice Elizabetta' YYYY, HYBRIDIZER 'Imperatrice Elizabetta' ( Dammann and Company, 1892). Series Unguiculares. November to March. Color Code B3L, Li...
(SPEC) 'Impostor In Purples' 1994, Tankesley Clarke 'Impostor In Purples' ( Eric and Bob Tankesley Clarke, R. 1994) SPEC, 18 20" (46 51 cm). Early bloom. Standard...
(Spec) 'Indianensis' 1930, Perry 'Indianensis'. ( Amos Perry, 1930). VERS. Color Code R2M; Medium blue toned feathered red. Listed by Perry in 1930. Iris versicol...
■ (SPEC) Iris innominata L. F. Hend. 1930, Henderson Iris innominata Louis Forniquet Henderson (Collected by Mrs. John R. Leach, 1928, Curry County, Oregon) Cal (...
(SPEC) Iris iochroma Small aka 'Iochroma' 1931, Small 'Iochroma' ( John Kunkel Small, R. 1931). Vinic; Color Code R1D; "Flower stalk erect: sepals recurved spread...
(SPEC) Iris iocyanea Small aka 'Iocyanea' 1931, Small 'Iocyanea' (John Kunkel Small, R. 1931). Vinic; Color Code B7D; Described by Small as "Flower stalk erect, s...
(SPEC) 'Iodantha' 1931, Alexander 'Iodantha' ( Edward Johnston Alexander, R. 1931). Vinic; Color Code B7M; Royal Gardens describes as "4 ft. One of the largest an...
(SPEC) 'Ioleuca' 1931, Alexander 'Ioleuca' ( Edward Johnston Alexander, R. 1931). Vinic; Color Code S3M; Alexander describes it as "Flower stalk erect stiff: sepa...
(SPEC) 'Iophaea' 1931, Alexander 'Iophaea' (Edward Johnston Alexander, R. 1931). Vinic; Color Code S3L; Light blue toned bicolor blend; as Iris iophaea Alex in Bo...
(Spec) 'Itazpejuta' 1992, Duffy 'Itazipejuta' (Lawrence J. Duffy, R. 1992). Seedling #W1 35 81. SPEC. 30 36" (76 91 cm), Early bloom. Purple red with white streak...
(SPEC) 'It's Mine' 1981, Kokich 'It's Mine' (Phylliss Kokich, R. 1980) LAEV, 25.5" (65 cm). Midseason bloom. White with very pale green infusion, thumbspot of dee...