Asclepias tuberosa subsp. rolfsii

(Britton ex Vail) Woodson

Ann. Missouri Bot. Gard. 31: 368. 1944.

Common names: Rolfs’s milkweed
Endemic
Basionym: Asclepias rolfsii Britton ex Vail in J. K. Small Fl. S.E. U.S., 943, 1336. 1903
Treatment appears in FNA Volume 14.

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.


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

Discussion

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.

Selected References

None.

Lower Taxa

None.
Mark Fishbein +
(Britton ex Vail) Woodson +
Asclepias rolfsii +
Rolfs’s milkweed +
Fla. +  and Ga. +
0–200 m. +
Dunes, sandhills, flood plains, limestone, sandy soils, pine flatwoods, pine, pine-oak, and oak-palmetto scrub. +
Flowering year-round +  and fruiting Jun–Sep. +
Ann. Missouri Bot. Gard. +
Acerates +, Anantherix +, Asclepiodella +, Asclepiodora +, Biventraria +, Oxypteryx +, Podostemma +, Podostigma +  and Solanoa +
Asclepias tuberosa subsp. rolfsii +
Asclepias tuberosa +
subspecies +