Here's an old thread on fragrance. Your warped foliage could be due to temperatures or Round-Up drift.

Fragrant Irises - The List
Posted by Phantomfyre z5b NE Ohio (My Page) on Mon, May 17, 04 at 7:59

The question of which irises are fragrant is often asked, so it has been suggested that we have an ongoing Fragrance thread that is periodically bumped to the top of the forum, and that can be continually added to as we find varieties to add.

A note: If you are an AIS member, there is a Fragrance Robin. To join, contact the Robin Chairperson, listed in the front of your AIS Bulletins.

Many irises are fragrant to some extent, but some are especially so. So, as your irises bloom, please post your fragrant varieties here.

CELESTE (Lemón 1858)
CREATIVE STITCHERY - like a birthday cake
DAREDEVIL
Death By Chocolate an SDB carried by SnowPeak.
DEVIL'S LAKE very fragrant
EASTER SONG
ELECTRIQUE remember as having a nice fragrance when you're near them
ENGLISH COTTAGE smells like line-dried laundry
EVER AFTER
FALL RERUN
FANCY WOMAN remember as having a nice fragrance when you're near them
FINALIST was very fragrant tonight
FLUSHED DELIGHT
FRAGRANT CLOUD is a TB that's taupe/gray colored. Originially listed only as a gray iris from my local supplier but blooms for me closer to tan. Smells like a floral perfume.
FRAGRABT LILAC a TB carried by just about everybody.
FRENCH PERFUME, TB, strong sweet/perfumy scent
I. pallida, sweet scent - often like grapes, grape Kool-Aid or grape bubble gum
GAY PARASOL (Schreiner 1974)
GOLDEN IMMORTAL
GYPSY WOMAN - lovely anise candy fragrance
IDOL'S DREAM, TB, lemon meringue scent
LAST KNIGHT, which smells like some daffodils. It is a large very ruffly deep magenta.
LILAC WINE
LIME MIST, SDB, lime scent
LINGERING MELODY
LOIS PARRISH
MAKES SCENTS, TB, strong sweet scent
MANDOLIN
MANOR BORN
MISTY LADY
PEKING SUMMER, TB, orange scent
PERFUME COUNTER
PETITE POLKA, SDB, hot chocolate/cocoa scent
PINK SLEIGH
PINKNESS
POCAHONTAS, historic TB, sweet grape scent
RADIENT APOGEE is fragrant.
RIPPLING RIVER has a definite and pleasant fragrance.
SCOTTISH WARRIOR (Sutton '02) Strong what I would call a male's cologne musky scent!!
Scottie smelled so strongly he found a new home on the porch!
SNEEZY (Keppel '96) Same kind of scent as above, only tolerable!
SOUTHLAND GRAPE fragrant from quite a distance
SUGARTIME fragrant
SUPERSTITION (Schreiner 1977)
THAT SCENTSATION

I agree with you, Walter. Not only do older blooms seem to lose their fragrance, I think sometimes they get downright stinky! I think humidity and temperature (and probably other factors, too) also play a role in how fragrant blooms appear to be.