Alpine Sweet-Vetch

hedysarum alpinum

Alpine Sweet-Vetch (Hedysarum alpinum) is a resilient, perennial wildflower belonging to the legume family. Native to the subarctic and boreal regions of North America and Eurasia, this plant is celebrated for its beautiful sprays of pink-purple flowers and its vital role in high-latitude ecosystems. It is especially famous for its fleshy, edible taproots, which have historically sustained indigenous communities and wildlife alike through harsh northern winters. It thrives in gravelly river flats, alpine meadows, and open woodlands, bringing a burst of color to rugged northern landscapes. Want to find and snap Alpine Sweet-Vetch yourself? Get the Snappit app.

Habitat: Typically found on gravelly river flats, subalpine meadows, rocky slopes, and open boreal forests.

Appearance

This herbaceous perennial typically grows to a height of 20 to 70 centimeters. It features erect, clumped stems adorned with pinnately compound leaves, each composed of 9 to 21 oblong, lance-shaped leaflets. In mid-to-late summer, it produces dense, one-sided racemes of drooping, pea-like flowers that range in color from pale pink to deep magenta. Following pollination, the flowers develop into distinctive, jointed seedpods called loments, which are flat, segmented, and contain individual seeds within each section.

KingdomPlantaePhylumTracheophytaClassMagnoliopsidaOrderFabalesFamilyFabaceaeGenusHedysarum

Alpine Sweet-Vetch

Interesting facts

Historically, Indigenous peoples of Alaska and northern Canada harvested the sweet-tasting roots, eating them raw, boiled, or preserved in seal oil or lard.

It looks incredibly similar to the highly toxic 'Mackenzie's Sweet-Vetch' (Hedysarum mackenziei), making extremely careful identification crucial for wild foragers.

The plant became central to a modern survival mystery in Jon Krakauer's book 'Into the Wild', which hypothesized that adventurer Christopher McCandless died in Alaska after consuming toxic seeds of this plant, later proven to contain the toxic amino acid L-canavanine.

Special abilities

Houses symbiotic rhizobia bacteria in its root nodules to convert atmospheric nitrogen into usable nutrients, enriching poor subarctic soils.

Develops a thick, woody, and deeply penetrating taproot that helps it survive intense winds, soil erosion in gravel riverbeds, and severe winter freezes.

Produces segmented seedpods (loments) that easily break apart into individual units to be dispersed by wind, water, or passing animals.

Measurements & details

Length: 20-70 cm
Weight: 0.05-0.3 kg
Lifespan: 5-20 years

Diet & Feeding

As a photosynthetic plant, the Alpine Sweet-Vetch produces its own energy using sunlight, carbon dioxide, and water, supplemented by nitrogen fixed through a symbiotic relationship with soil bacteria.