Classification Hierarchy
Kingdom Plantae
Subkingdom Tracheophyta
Superdivision Spermatophyta
Division Magnoliophyta
Class Magnoliopsida
Subclass Asteridae
Order Gentianales
Family Apocynaceae
Genus Asclepias
Species Asclepias tuberosa
Butterfly milkweed

Date: June 15, 2010. Location: HHoover NHS visitor center(map)

BONAP, FNA, ITIS, USDA, VPI

Scientific Name: Asclepias tuberosa (Asclepius [or Aesculapius] was the Greek god of healing; tuberosa = tuberous)

Common Name: Butterfly milkweed

Origin: Native

Notes: Most milkweeds exude a milky sap when wounded. However, the sap from this milkweed is clear.

Additional references: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14.

Field Marks for Identification:

Flowers: June, yellowish to red orange, pedicels and stems hirsute; inflorescence - terminal and axial umbels; fruit - upright pubescent follicles on deflexed pedicels, lance-fusiform.

Leaves: irregularly alternate - sometimes in small part opposite, linear-lanceolate to oblong-ovate, sessile or slightly petioled.

Glossaries of botanical terms: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.

Butterfly milkweed-1 Butterfly milkweed-2 Butterfly milkweed-3 Butterfly milkweed-4 Butterfly milkweed-1 Butterfly milkweed-2 Butterfly milkweed-3 Butterfly milkweed-4 Butterfly milkweed-1 Butterfly milkweed-2 Butterfly milkweed-3 Butterfly milkweed-4 Butterfly milkweed-2 Butterfly milkweed-3 Butterfly milkweed-4 Butterfly milkweed-4 Butterfly milkweed-2 Butterfly milkweed-3 Butterfly milkweed-4 Butterfly milkweed-4