Neomarica gracilis or walking iris has sword like leaves.
Opposite arrangement
Iris can get bacterial leaf blight, fungal leaf spot, fungal crown rot, iris borers, aphids, verbena bud moths, crickets and wood lice.
alternate
Two
Ivy plants have alternate leaf arrangement, which means that leaves are arranged along the stem in an alternating pattern. Each leaf grows in a staggered formation rather than directly across from each other.
Leaf veins.
single
alternate
whorled Being a member of the family Lamiaceae, basil leaf has opposite arrangement
Shagbark Hickory has an alternate leaf arrangement.
Yes, an iris is considered a monocot plant. Monocots have seeds with only one cotyledon (seed leaf) and typically have parallel veined leaves, and the iris fits these characteristics.
opposite