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Lathyrus graminifolius - (S.Watson) T.G.White

Common Name Grassleaf Peavine
Family Fabaceae
USDA hardiness 4-8
Known Hazards Although no specific records of toxicity have been found for this species, the seed and other parts of many Lathyrus species contain a toxic amino acid. It is produced in the plant at about the same time that the seed starts to develop. In small quantities the amino acid is innocuous, and the seeds of several Lathyrus species are eaten as a nutritious part of the diet. However, in larger quantities (the seed should form less than 30% of a balanced diet), it can cause a very serious disease of the nervous system known as 'lathyrism'. Symptoms appear as a paralysis of the muscles below the knees, pains in the back, followed by weakness and stiffness of the legs and progressive locomotive incoordination[65 , 76 , 1309 ].
Habitats Pine forests, hillsides.
Range Southern N. America - Arizona, New Mexico, Texas, northern Mexico
Edibility Rating    (2 of 5)
Other Uses    (2 of 5)
Weed Potential Yes
Medicinal Rating    (0 of 5)
Care (info)
Fully Hardy Well drained soil Moist Soil Full sun
Lathyrus graminifolius Grassleaf Peavine


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Lathyrus graminifolius Grassleaf Peavine
NPS Photo by Michael Quinn Grand Canyon National Park Creative Commons Attribution 2.0

 

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Summary

Lathyrus graminifolius is a herbaceous perennial plant with erect or clambering stems that attach themselves to surrounding vegetation by means of tendrils; the plant can grow 20 - 60cm tall. The plant is harvested from the wild for local use as food; It has as excellent potential for use in erosion control along the sides of highways and gullies[1309 ]. Grassleaf peavine produces edible leaves (fresh or cooked) of modest value; seedpods are not edible for this species. It grows from Zones 4-8, is native, and not generally weedy or invasive.


Physical Characteristics

 icon of manicon of flower
Lathyrus graminifolius is a PERENNIAL growing to 0.5 m (1ft 8in) by 0.4 m (1ft 4in).
See above for USDA hardiness. It is hardy to UK zone 5 and is not frost tender. The flowers are pollinated by Insects.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It cannot grow in the shade. It prefers dry or moist soil and can tolerate drought.

UK Hardiness Map US Hardiness Map

Synonyms

Homotypic Synonyms: Lathyrus palustris var. graminifolius S.Watson. Heterotypic Synonyms: Orobus dissitifolius Alef.

Plant Habitats

Edible Uses

The tender young plant is eaten as greens in the spring[257 ]. Grassleaf peavine (Lathyrus graminifolius) is a perennial species of the bean family. All species in its genus contain toxic compounds known as lathyrogens, which can cause serious health effects (neurolathyrism, osteolathyrism) if eaten in large quantities or over long periods. Boiling helps reduce these toxins, but does not completely remove them. For L. graminifolius, the seedpods are not reported edible—it is listed among the Lathyrus species whose seedpods are not edible. However, the leaves are reported edible (both fresh and cooked), though they are generally small, sparse, and of modest food value. The flavor is pea-pod-like but more bitter than commercial pea pods. Young seedpods of related Lathyrus species are tender and may be eaten like pea pods, but mature pods become dry, papery, and inedible. Flowers appear from April to September, and young pods follow soon after the blossoms, giving a long gathering season. Because of the plant’s tendency to be eaten by animals or lost to disease before pods mature, yields are often unreliable. Grassleaf peavine was also reportedly eaten by the Karok Indians in the northwest, though plant distributions suggest possible confusion of species in that record [2-3].

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

The plant has a horizontal, spreading root system and has excellent potential in erosion control along the sides of highways and gullies[1309 ].

Special Uses

References   More on Other Uses

Cultivation details

A perennial or rhizomatous geophyte growing primarily in the temperate biome. Species in this genus generally grow well when given a position in full sun in most, moderately fertile, well-drained soils[200 ]. Established plants are drought tolerant[1309 ]. Unlike almost all the species in this genus, this species does not have a symbiotic relationship with soil bacteria and therefore does not fix atmospheric nitrogen[755 ]. USDA Hardiness Zones: Lathyrus graminifolius is hardy in approximately Zones 4-8. Sources suggest it can survive cold winters and tolerate moderate climates. Weed/Invasiveness: There’s no strong evidence that grassleaf peavine is invasive. It is a native plant in its range, not known to be aggressively weedy. It does not appear in lists of problematic weeds, though like many legumes it can persist under favorable conditions and spread locally.

References   Carbon Farming Information and Carbon Sequestration Information

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Plant Propagation

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.

Other Names

If available other names are mentioned here

Grassleaf peavine (Lathyrus graminifolius)

Native Range

Native to: Arizona, Mexico Northeast, Mexico Northwest, New Mexico, 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.

There’s no strong evidence that grassleaf peavine is invasive. It is a native plant in its range, not known to be aggressively weedy. It does not appear in lists of problematic weeds, though like many legumes it can persist under favorable conditions and spread locally.

Conservation Status

IUCN Red List of Threatened Plants Status : Not available

Related Plants
Latin NameCommon NameHabitHeightHardinessGrowthSoilShadeMoistureEdibleMedicinalOther
Lathyrus alatus Perennial0.6 -  LMHSNM10 
Lathyrus aphacaYellow-Flowered PeaAnnual0.9 -  LMHNDM11 
Lathyrus ciceraChickling Vetch, Red peaAnnual0.0 0-0  LMHNM10 
Lathyrus davidii Perennial1.2 5-9  LMHSNM10 
Lathyrus japonicusBeach Pea, Smallflower beach peaPerennial0.6 3-7  LMHNDM20 
Lathyrus japonicus maritimusBeach PeaPerennial0.6 3-7  LMHNDM203
Lathyrus lanszwertiiThickleaf, or Aspen PeavinePerennial0.5 5-9  LMHNDM202
Lathyrus latifoliusPerennial Sweet Pea, Perennial peaPerennial Climber2.0 5-9 FLMHSNDM302
Lathyrus linifolius montanusBitter VetchPerennial0.6 5-9  LMHSNM203
Lathyrus nervosusLord Anson's PeaPerennial Climber0.5 8-11  LMHNM20 
Lathyrus ochroleucasCream PeavinePerennial1.0 -  LMHSNM11 
Lathyrus ochrusCyprus VetchAnnual0.6 -  LMHNDM10 
Lathyrus odoratusSweet Pea, Wild Pea,VetchlingAnnual Climber2.0 2-11 FLMHSNM103
Lathyrus ornatusBush VetchlingPerennial0.3 3-7  LMHNDM11 
Lathyrus palustrisSlenderstem Peavine, Marsh peaPerennial Climber1.2 4-8  LMHNMWe10 
Lathyrus polymorphusManystem Peavine, Hoary peaPerennial0.4 0-0  LMHNM10 
Lathyrus pratensisMeadow VetchlingPerennial1.2 4-8  LMHNMWe011
Lathyrus quinquenervius Perennial0.6 -  LMHNMWe10 
Lathyrus sativusChickling Pea, White peaAnnual0.6 0-0  LMHNM213
Lathyrus sylvestrisFlat pea, Wood peaPerennial Climber1.5 6-9 FLMHSNM003
Lathyrus tuberosusEarthnut Pea, Tuberous sweetpeaPerennial1.2 5-9  LMHSNM503

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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(S.Watson) T.G.White

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Links / References

For a list of references used on this page please go here
A special thanks to Ken Fern for some of the information used on this page.

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