IB-MAC (Van Tubergen, 1910) OB I. iberica X I. macrantha. Reddish-violet bitone with small signal patch. It's most distinguishing characteristic is its slightly cup-shaped falls, inherited from I. iberica. Important  because there have been so many imposters on the market.  Valued as the first known amphidipoid arilbred, and the many-times-great-grandfather of many of today's arilbreds.

IMPUDENT ELF (McAllister, 1993) OGB Gene's Little Secret X Rose of Sharon. In an attempt to characterize its personality, one local wit dubbed this one "Little Pffft!" But I thought that "Impudent Elf" would be a much more euphonious, yet still accurate, moniker – and much more likely to win the Registrar's approval. It has a large red-violet spot that almost covers the inner half of its honeysuckle yellow falls, providing a contrast to the soft pinkish-lilac standards that is almost garish. Limited fertility. Has set pods to others of its line, but none of its offspring have been impressive.

INSCRUTABLE (McAllister, 1992) OGB+ Blue-violet standards; darker violet falls. The entire flower has a smoky overlay. Presumably an unbalanced tetraploid from Persian Pansy X Koko Knoll. It has produced a few seedlings when crossed with halfbreds (as both pod and pollen parent), more when used with tetraploid arils. So far, none have survived to bloom size – but I'm continuing to experiment with it. I'd also try it with TBs, if I had the stock. A very mysterious-looking flower that seemed to resist any name I tried to apply to it. In desperation one day, I commented to a friend that it was "inscrutable" and she replied, "I think you just named it." 

INVASION FORCE (McAllister, 1992) OGB Hidden Talents X Gene's Little Secret. Silvery-blue standards. Soft yellow falls, flushed burgundy with burgundy line extending from tip of yellow beard. Limitedly fertile when used with its half-sibs. Eight months after being lined out in the seedling bed, a little less than one year after germination, the original rhizome had put out 18 increases and had to be transplanted to a roomier location. The flower is nice, of course (pale silvery-blue standards and soft yellow falls blushed with burgundy) or it would have been tossed instead of introduced – but I chose a name to describe its unusually vigorous growth habits.

INVISIBLE HANDS (Hunt-McAllister, 1988) OGB Esther the Queen X Sierra Fawn. White standards; golden-yellow style arms and falls. Yellow beard; blood-red veining in signal area. Proven fertile both ways but I've given the seeds away. This song title had struck me as an appropriate name for an iris, and remained on my list of names-in-search-of-an-iris for some time before I matched it to this.

ISRAELI ROSE (Timbs, 1983) OGB+ Dorcas X Werckmeister's Beauty. Pale lavender-violet with deeper violet veining on the upper half of the falls and a rosy-violet signal. One of the early tetraploid 3/4-breds, with enough regelia in its background to thrive in Timb's upstate New York garden.