||This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. (March 2013)|
|Nutritional value per 100 g (3.5 oz)|
|Energy||414 kJ (99 kcal)|
|Thiamine (vit. B1)||0.17 mg (15%)|
|Riboflavin (vit. B2)||0.073 mg (6%)|
|Niacin (vit. B3)||1.65 mg (11%)|
|Pantothenic acid (B5)||0.599 mg (12%)|
|Vitamin B6||0.26 mg (20%)|
|Folate (vit. B9)||14 μg (4%)|
|Vitamin C||1.1 mg (1%)|
|Calcium||10 mg (1%)|
|Iron||2.57 mg (20%)|
|Magnesium||51 mg (14%)|
|Manganese||0.36 mg (17%)|
|Phosphorus||174 mg (25%)|
|Potassium||922 mg (20%)|
|Sodium||22 mg (1%)|
|Zinc||0.28 mg (3%)|
|Link to USDA Database entry
Percentages are roughly approximated
using US recommendations for adults.
Source: USDA Nutrient Database
Sagittaria latifolia is a plant found in shallow wetlands and is sometimes known as broadleaf arrowhead, duck potato, Indian potato, or wapato. This plant produces edible tubers that were extensively used by the Indigenous peoples of the Americas.
Broadleaf arrowhead is a variable-sized (2 to 10 meters in length) perennial growing in colonies that can cover large amounts of ground. The roots are white and thin, producing white tubers covered with a purplish skin a good distance (0.3 to 1 m long, 0.15 to 0.6 meter deep) from the mother plant. It is green and white.
The plant has a stem to speak of, producing a rosette of leaves and an inflorescence on a long rigid hamp. The leaves are extremely variable, from very thin at 1 to 2 cm to wedge shaped like those of Sagittaria cuneata. Spongious and solid, the leaves have parallel venation meeting in the middle and the extremities.
The inflorescence is a raceme composed of large flowers whorled by threes. Usually divided into female flowers on the lower part and male on the upper, although dioecious individuals are also found. Three round, white petals and three very short curved, dark green sepals. Male flowers are easily distinguished from female due to the dissimilarity between the 25 to 50 yellow stamens of the male and the sphere of green carpels of the female ones.
Widespread across North America, but also found natively in Hawaii, the Caribbean and the northern part of South America, broadleaf arrowhead has been introduced in Europe and Australia, where it is considered an invasive weed. The plant is considered rare in Alberta. It can be found frequently in the Fraser Valley region of British Columbia.
Extremely frequent as an emergent plant, broadleaf arrowhead forms dense colonies on very wet soils that become more open as the species mixes with other species of deeper water levels. These colonies forms long bands following the curves of rivers, ponds and lakes, well marked by the dark green color of the leaves. The plant has strong roots and can survive through wide variations of the water level, slow currents and waves. It displays an affinity for high levels of phosphates and hard waters.
Despite the name Duck Potato, ducks rarely consume the tubers, which are usually buried too deep for them to reach, although they often consume the seeds. Beavers, North American Porcupines, and Muskrats, however, eat the whole plant, tubers included.
Easily cultivated in 0.15 m to 0.45 m of water with no or little current. Plant tubers well spaced (no more than 12 plants per square meter) at the end of May at a depth of 5 to 7 cm. Fertilize with decomposed manure. Multiply through seeding or division in July. The tubers of Sagittaria latifolia and Sagittaria cuneata have long been an important food source to indigenous peoples of the Americas. The tubers can be detached from the ground in various ways: with the feet, a pitchfork, or a stick, and usually then float to the surface. Ripe tubers can be collected in the fall and are often found floating freely.
These tubers can be eaten raw or cooked for 15 to 20 minutes. The taste is similar to potatoes and chestnuts, and they can be prepared in the same fashions: roasting, frying, boiling, and so on. They can also be sliced and dried to prepare a flour.
It is vulnerable to aphids and spider mites.
- Blanchan, Neltje (2005). Wild Flowers Worth Knowing. Project Gutenberg Literary Archive Foundation.
- "Sagittaria latifolia - Willd. Duck Potato". Edible and medicinal plant database. Plants For A Future. June 2004. Retrieved 2007-07-20. "Excellent when roasted, the texture is somewhat like potatoes with a taste like sweet chestnuts"
- "58518-1". IPNI. 2004-07-14. Retrieved 2007-07-21. "Alismataceae Sagittaria latifolia Willd. Sp. Pl. iv. 409."
- "Sagittaria latifolia". Natural Resources Conservation Service PLANTS Database. USDA.
- Spurgeon, Terrence (2001). Wapato (Sagitaria latifolia) In Katzie Traditional Territory, Pitt Meadows, British Columbia. Retrieved 2012-03-19.
- Coeur d'Alene Tribe’s annual Water Potato Days Festival video
- Water Potato Day, Coeur d'Alene Tribe