Coefficient of Conservatism:
Coefficient of Wetness:
WILD BLUE FLAG
G. E. Crow
Wet places generally: lake shores, marshes, river borders, stream bottoms, meadows, ditches, swamps, and sphagnum bogs.
The cauline leaves of I. versicolor are shorter than the tops of the inflorescence, while in I. virginica the cauline leaves frequently overtop the flowers. The ovaries of I. versicolor (at anthesis) are somewhat shorter (1–2 cm long), at least one of them frequently exserted on the pedicel beyond the tip of the spathe, while in I. virginica the ovaries (before forming fruit) are 1.5–3 cm long and usually are not exserted. The bases of plants of I. versicolor are more frequently flushed with purple than are those of I. virginica, which are generally brown. All of these characters are variable, and several must often be considered before identification can be made. A hybrid between the two species has been described as I. ×robusta E. S. Anderson, on the basis of two colonies studied in Mackinac Co. near St. Ignace and at Engadine. Partial albinos (or pale blue forms) are more common in I. virginica.