Calla palustris contains calcium oxalate, which acts as an oral irritant. It causes a burning sensation in the mouth, swelling, and difficulty swallowing. Because the flower is considered ornamental, it is very hazardous to dogs and cats when ingested.
It is said that the calcium oxalate can be neutralized by drying and thoroughly cooking the plant. The root (or rhizome) is considered edible after drying and cooking. Like always, I never recommend eating a plant with toxic qualities such as this. Historically the root has been used by indigenous people as an orthopedic aid, respiratory aid, snake bite remedy, and as a poison (see the Native American Ethnobotany Database).
Alaska Stickers on Amazon
The water arum (Calla palustris) is a hermaphroditic plant that is pollinated by flies and other insects. The stem arises from a creeping rhizomatous root system near the surface. It has a few large basal leaves, from a 6-30 cm petiole. The blade is cordate (heart-shaped) and about 4-14 cm (1.5-6 in) wide, and only slightly longer. The inflorescence is typically a single, large, white spathe (sheathed bract) and spadix on a thick short stem (a subspecies exists with 2-3 spathes per plant, C. palustris forma polyspathacea). The spadix is usually light green early in the year and densely packed with small flowers, each with a green ovoid pistil with 6-9 stamens. The ellipsoid seeds ripen to a reddish or dark brown later in summer.
Water arum lives in both wet terrestrial or aquatic environments and acidic soils. It frequently grows from shallow depths on lake or pond shores and marshes. It’s usually found in sunny or partially shaded areas.
The Kamchatka fritillary, also commonly known as the chocolate lily (Fritillaria camschatcensis) is a brown flowering plant living mostly in coastal areas in Alaska and northwestern North America and coastal...