Rolfs’s milkweed

Asclepias rolfsii Britton ex Vail in J. K. Small, Fl. S.E. U.S., 943, 1336. 1903

Stems 15–70 cm. Leaf blades lanceolate to oblong or linear-lanceolate, 2.5–6 × 0.3–1.2 cm, base hastate, margins crisped, apex rounded to acute.

Flowering year-round; fruit­ing Jun–Sep. Dunes, sandhills, flood plains, limestone, sandy soils, pine flatwoods, pine, pine-oak, and oak-palmetto scrub; 0–200 m; Fla., Ga.

Subspecies rolfsii is nearly restricted to sandy sub­strates in peninsular Florida and southern Georgia and is most common on the central ridges of these states. It has been reported in error from Alabama, Mississippi, North Carolina, and Virginia. Plants of subspp. tuberosa and interior from sandy sites in southern South Carolina approach subsp. rolfsii and may be accommodated more properly here.