Overview
Asclepias humistrata, commonly called sandhill milkweed or pinewoods milkweed, is a perennial in the milkweed group adapted to dry, sandy sites in the southeastern United States. It is frequently noted in species lists and floras as characteristic of sandhill and longleaf pine ecosystems; see species records for occurrence data. Taxonomic treatments place it in the Asclepiadoideae subfamily; see subfamily resources for context.
Description and Identification
Sandhill milkweed grows about 0.3–0.9 m (1–3 ft) tall and bears clusters (umbels) of rose-pink to pale pink flowers in late spring to early summer. Leaves are typically narrow to lance-shaped, alternately arranged or appearing opposite on short stems. The plant exudes the characteristic milky sap when damaged. Diagnostic features include the reflexed corolla lobes surrounding a prominent corona (crown) and seed follicles that open to release silky-haired seeds for wind dispersal. Field guides and regional treatments provide identification keys and images: regional guides.
Habitat and Distribution
A. humistrata is native to the coastal plain and inland sandy uplands of the southeastern U.S., where it occupies well-drained, nutrient-poor soils beneath open pine canopies or in scrub and sandhill habitats. It is often reported in restoration efforts for longleaf pine communities; consult taxonomic resources and distribution maps for local occurrences and range notes.
Ecology
As with other milkweeds, this species is important for pollinators: its nectar attracts bees, butterflies and other insects, while its foliage serves as a host for monarch (Danaus plexippus) larvae and other specialist herbivores. The milky latex contains cardiac glycosides that can deter generalist herbivores and provide chemical defenses to specialists. For summaries of ecological roles and conservation implications see ecological notes.
Cultivation and Propagation
The plant thrives in full sun and extremely well-drained sandy or rocky soils, showing good drought tolerance and low fertility requirements. It is suited to native plantings, xeriscapes and habitat restoration projects. Propagation is typically from seed; cold stratification and scarification can improve germination. Practical guidance and nursery information are available at cultivation guides and seed supplier pages.
Conservation and Management
Conservation status varies regionally; populations may benefit from fire-managed longleaf pine restoration and control of invasive competitors. Land managers and gardeners should consult local assessments before collecting seed or plants. See state assessments and restoration resources for practical recommendations and legal considerations.