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Lupinus diffusus is a species of lupine native to the southeastern United States, from North Carolina south to Florida and west to Mississippi. t is a perennial herbaceous plant growing to 30–50 centimetres (12–20 in) tall. The leaves are palmately compound with 3-5 leaflets 6–12 centimetres (2.4–4.7 in) long and 3–5 centimetres (1.2–2.0 in) broad, gray-green to silvery green, covered with fine white hairs. The flowers are pale blue or violet, produced in a dense spike 15–30 centimetres (5.9–11.8 in) long.
It is restricted to very dry, sandy soils, often in open pine or oak woodlands. This one was spotted at the Aiken Gopher Tortoise Heritage Preserve near Windsor (Aiken County), SC.
Other common names include Oak Ridge Lupine and Spreading Lupine.