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Summary
Lathyrus polymorphus Nutt.
First published in Gen. N. Amer. Pl. 2: 97 (1818)is a synonym of Lathyrus decaphyllus var. decaphyllus. Plains peavine is a native perennial of the Great Plains with scattered populations extending into the southwestern United States, particularly New Mexico. Historically, its young seedpods were eaten by several Native American groups, although they were generally regarded as a minor food resource rather than an important staple. Like all members of the genus, plains peavine contains toxic lathyrogens, making regular consumption unsafe. Its edible seedpods resemble cultivated peas but are noticeably more bitter and stringier.
Physical Characteristics

Lathyrus polymorphus is a PERENNIAL growing to 0.9 m (3ft) by 0.9 m (3ft in) at a medium rate.
See above for USDA hardiness. It is hardy to UK zone 4. It is in flower from June to July, and the seeds ripen from July to August. The species is hermaphrodite (has both male and female organs) and is pollinated by Bees, insects.
It can fix Nitrogen.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist soil.
UK Hardiness Map
US Hardiness Map
Synonyms
Lathyrus decaphyllus var. decaphyllus. L. decaphyllus.
Plant Habitats
Cultivated Beds;
Edible Uses
Edible Parts: Seedpod
Edible Uses:
Plains peavine has a modest history as a traditional Native American food but was never considered an important resource. Although its young seedpods resemble cultivated peas, their bitterness, stringy texture, and toxic lathyrogens greatly limit their value. It is best regarded as an occasional emergency food rather than a dependable edible plant. Young seedpods are edible only after thorough cooking. Harvest them while green, tender, and immature, as mature pods become dry, papery, and unsuitable for eating. Historical accounts indicate that the Omaha people occasionally ate the young pods, particularly as snacks for children, while the Acoma, Laguna, and Cochiti peoples of New Mexico also consumed the whole immature pods. Because the plant belongs to the Lathyrus genus, all edible use should be limited to occasional consumption after adequate cooking [2-3]. Edibility Rating: 2 out of 5 – Historically edible but only of minor importance, with modest flavor and significant safety limitations [2-3]. Taste and Preparation: Young seedpods taste much like cultivated pea pods but with a stronger bitter note. The texture is somewhat stringy, while the interiors remain mostly hollow until the developing seeds enlarge. Boiling softens the pods and reduces bitterness but does not completely eliminate the naturally occurring lathyrogens. Mature pods should not be used because they rapidly become dry and fibrous. Seasonality (Phenology): Plants flower from April through September, with young edible seedpods developing shortly after flowering and remaining suitable for harvest only while immature. Nutritional Value: Like other peas, the young pods provide carbohydrates, fiber, modest amounts of protein, and vitamins. However, toxic amino acids limit their nutritional value and restrict safe consumption [2-3]. Traditional Uses: Historical records indicate that the Omaha Indians ate the young seedpods, although they considered them unimportant. Acoma, Laguna, and Cochiti peoples of New Mexico also consumed the immature pods. These references suggest that plains peavine served as an occasional seasonal vegetable rather than a staple food. Warning: Plains peavine contains lathyrogens, toxic amino acids capable of causing neurolathyrism and osteolathyrism following prolonged or excessive consumption. Thorough boiling reduces but does not eliminate these compounds. The plant should only be consumed occasionally and never relied upon as a staple food [2-3]. Seedpods and seeds[46, 61, 105, 257].
References More on Edible Uses
Medicinal Uses
Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.
None known
References More on Medicinal Uses
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Other Uses
Occasionally grown in native plant gardens but rarely cultivated because of its limited ornamental appeal and toxic properties. Wildlife Value: The flowers provide nectar and pollen for bees, while wildlife and livestock browse the foliage. Seeds are consumed by small mammals and birds. Pollinators: Native bees and bumblebees primarily pollinate the pea flowers.
Special Uses
Nitrogen Fixer
References More on Other Uses
Cultivation details
Plains peavine grows best in full sun to partial shade on well-drained soils. It tolerates prairie conditions, open woodland, and light grazing, although heavy grazing often removes flowering stems before pods can develop. Habitat: Native to the Great Plains, with scattered populations extending into New Mexico and other parts of the Southwest. It occurs in grasslands, open woodlands, prairies, and lightly wooded hillsides. USDA Hardiness Zones: Zones 4–8. Growth Rate: Moderate. Perennial plants emerge each spring from established root systems and gradually expand over time. Mature Size: Typically 20–90 cm (8–36 in.) tall or climbing slightly through surrounding vegetation, with a spread of 30–90 cm (1–3 ft). Cultivation: Occasionally grown in native plant gardens but rarely cultivated because of its limited ornamental appeal and toxic properties. It prefers sunny sites with well-drained soils. Identification: Plains peavine is recognized by its climbing or sprawling stems, paired leaflets ending in branched tendrils, butterfly-shaped flowers, and long, narrow pea pods. Like other peavines, the flattened hairy style and terminal tendrils distinguish it from true vetches. Similar Species: Bonneville peavine (Lathyrus brachycalyx) closely resembles plains peavine and has sometimes been treated as a synonym. Other native peavines (Lathyrus spp.) share similar flowers and pods, while vetches (Vicia spp.) differ in having more numerous leaflets and rounded hairy styles.
References Carbon Farming Information and Carbon Sequestration Information
Temperature Converter
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Fahrenheit:
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Plant Propagation
Usually propagated from seed. Scarification improves germination, while established plants may also spread slowly through perennial rootstocks. Pre-soak the seed for 24 hours in warm water and then sow in early spring in a cold frame[200]. When they are large enough to handle, prick the seedlings out into individual pots and plant them out in the summer. If you have sufficient seed, then it can also be sown in situ in mid-spring [200]. Division in spring. It may not transplant well, so care should be taken[200].
Other Names
If available other names are mentioned here
Manystem Peavine, Hoary pea, Plains peavine, manystem peavine, manyform peavine
Native Range
NORTHERN AMERICA: United States (Kansas, Nebraska, Oklahoma, South Dakota (southwest), Colorado (east), New Mexico (east), Texas)
Weed Potential
Right plant wrong place. We are currently updating this section.
Please note that a plant may be invasive in one area but may not in your area so it's worth checking.
Low. Plains peavine is a native perennial that spreads slowly and is not considered invasive.
Conservation Status
IUCN Red List of Threatened Plants Status : Not listed.
Growth: S = slow M = medium F = fast. Soil: L = light (sandy) M = medium H = heavy (clay). pH: A = acid N = neutral B = basic (alkaline). Shade: F = full shade S = semi-shade N = no shade. Moisture: D = dry M = Moist We = wet Wa = water.
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Expert comment
Author
Nutt.
Botanical References
235
Links / References
For a list of references used on this page please go here
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Subject : Lathyrus polymorphus
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