wild calla

(Calla palustris)

Conservation Status

IUCN Red List

LC - Least Concern

wild calla



NNR - Unranked

SNR - Unranked


not listed


Great Plains

OBL - Obligate wetland


OBL - Obligate wetland

Northcentral & Northeast

OBL - Obligate wetland



Photo by Luciearl



Wet. Wetlands, including bogs, fens marshes, swamps, and edges of ponds and lakes. Partial sun to medium shade. Acidic peaty soil.


May to July

Flower Color



4 to 11


Wild calla is a common plant in northern wetlands. It is found throughout northern Europe, northern Asia, and northern North America. In the United States it is found from Maine south to Pennsylvania and west to Minnesota. In Minnesota it is most common in the northeast, north-central, central, and metro regions, mostly absent in the southern third of the state and the far western counties. It is found usually within or adjacent to woodlands in a wide variety of wetlands, including bogs, fens, marshes, and swamps, and at the edges of ponds and lakes. It grows under partial sun to medium shade in acidic peaty soil or muck.

Wild calla is a 4 to 11 tall perennial forb that rises on multiple leaves and flowering spikes from a horizontal stem (rhizome). The rhizome is to 1316 long, (1 to 3 cm) thick, and may be at or just below the surface of the soil.

Leaves appear before the flowers. They arise singly at intervals along the rhizome and in a small cluster at the tip of the rhizome. If the rhizome is submerged the leaves rise out of the water. The leaves are 1916 to 5½ (4 to 14 cm) wide, They are on 2 to 111316 (6 to 30 cm) long leaf stalks (petioles). The petioles are stout, 1½ to 2 times as long as the blade, longer if under water. The leaf blades are egg-shaped to nearly round, heart shaped at the base, and taper to a short point at the tip with concave sides along the tip. There is a central vein (midvein) at the base and numerous parallel lateral veins originating form the midvein and arcing toward the leaf tip. The upper leaf surface is bright green, hairless, and somewhat shiny. The margins are untoothed.

The inflorescence is a spike with tiny flowers crowded on a thickened axis (spadix). The spadex is subtended by a single, large, petal-like bract (spathe).

The spathe is white, egg-shaped to elliptic, and 1316 to 3 (3 to 8 cm) long. It is tube-like just at the base then broadly expanded. It does not enclose the spadix. It has an abrupt, green, to (4 to 10 mm) long, tip that is tightly rolled into a sharp point. The underside of the spathe is sometimes light green.

The spadix is greenish-white, cylinder shaped, shorter than the spathe, ½ to 1¼ tall, and rounded at the tip. It is densely covered with numerous perfect (bisexual) flowers along its length, and with male (staminate) flowers just at the top. Individual flowers have 6 to 12 stamens but no floral leaves (sepals) and no petals. The stamens are white and surround a green, cone-shaped pistil.

The fruit is a fleshy, pear-shaped, ¼ to ½ (6 to 12 mm) long, 316 to (5 to 10 mm) wide berry with a few seeds. It is green at first, turning red at maturity. It is not embedded in the spadix. The spathe and spadix turn green in fruit.



Distribution Distribution Map  

Sources: 2, 3, 4, 5, 7, 24, 28, 29, 30.


All parts of wild calla are poisonous if ingested. Dried mature fruits can be consumed. Flour made from the rhizome can be consumed so long as the rhizome is dried, ground, leached, and boiled. However, flour made in this way should be used only “in times of need.” Humans may recover from a severe poisoning case but are likely to sustain permanent kidney and liver damage.



Araceae (arum)










bog arum

water arum


wild calla

wild calla-lily













Modified leaf at the base of a flower stalk or flower cluster.



The stalk of a leaf blade or compound leaf that attaches the leaf blade to the stem.



A horizontal, usually underground stem. It serves as a reproductive structure, producing roots below and shoots above at the nodes.



An outer floral leaf, usually green but sometimes colored, at the base of a flower.



A spike with small flowers crowded on a thickened, fleshy axis, usually enclosed in a spathe.



One or two large bracts that subtend, hood, or sometimes envelope a flower or flower cluster, as with a Jack-in-the-Pulpit.

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Other Videos
  Calla palustris ďáblík bahenní
Karel Filip

Jan 20, 2015

Vzácná jedovatá rostlina, ohrožený druh.

Google translation: Rare poisonous plant, endangered species.




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Location: Cass County

wild calla

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Created: 8/19/2020

Last Updated:

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