Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
59. Araceae, the Arum Family
2. Calla L. -- Water arum
1. Calla palustris L.
Arising from thick sprawling rhizomes, the rhizomes buried in mud or floating
under the water surface. Leaves petioled, the blades broadly heart-shaped,
cordate, mucronate at the tip, 5-15 cm long, about as wide as long; petioles
stout, flaccid when submersed, 5-20 cm long, often longer when submersed. Scape
resembling the petioles; spathe and spadix terminal, the spathe
clearly differentiated from the scape, white, ovate, caudate at the tip, exceeding
or about equaling the mature spadix; spadix borne on a short stipe, short-cylindric,
3-4 cm long in fruit, 2-3 cm thick. Flowers perfect or the uppermost
staminate; perianth none; pistil simple. Fruit a fleshy
berry, ripening red, 8-12 mm long, containing few seeds. Jun--Jul. Bogs and
swamps; rare in ND, with local populations in Pembina and Rolette counties;
(Circumboreal, in N.Amer. s to MD, IN, IA, n ND and nw to c AK).
Previous Section -- Acorus calamus L.
Return to Family -- Araceae - The Arum