It eats a large variety of green plants, including different kinds of grasses, sedges, thistles and fireweed.
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Mild sweeteners such as fireweed (Epilobium angustifolium), camas bulb (Camassia quamash) or sweet berries such as salal berries (Gaultheria shallon), or thimbleberries (Rubus parviflorus) are occasionally added.
These include crested cinquefoil or crested potentilla (Potentilla cristae), Siskiyou fireweed (Epilobium siskiyouense), and McDonald's rock cress (Arabis blepharophylla var. macdonaldiana), a perennial found in conifer forests of California and Oregon.
Rare perennials include the Siskiyou fireweed (Epilobium siskiyouense), and several types of lousewort (Pedicularis).
In Alaska, snowshoe hares consume new leaves of blueberries (Vaccinium spp.), new shoots of field horsetails (Equisetum arvense), and fireweed (Epilobium angustifolium) in spring.