Butterfly weed

Butterfly weed
File:Butterfly Weed Entire Flower Head 2608px.jpg
Scientific classification
Kingdom: Plantae Division: Magnoliophyta Class: Magnoliopsida Order: Gentianales Family: Apocynaceae Subfamily: Asclepiadoideae Genus: Asclepias Species: A. tuberosa
Binomial name
Asclepias tuberosa L.

Butterfly weed (Asclepias tuberosa, also called Canada root, Chigger flower, Chiggerflower, Fluxroot, Indian paintbrush, Indian posy, Orange milkweed, Orange Swallow-wort, Pleurisy root, Silky Swallow-wort, Tuber root, Yellow milkweed, White-root, Windroot) is a species of milkweed native to eastern North America. It is a perennial plant growing to 0.6-2 m (1 -2 feet) tall, with clustered orange or yellow flowers from early summer to early fall. The leaves are spirally arranged, lanceolate, 5-12 cm long and 2-3 cm broad.

This plant favors dry, sand or gravel soil, but has also been reported on stream margins.

The common name comes from the butterflies that are attracted to the plant by its color and its copious production of nectar. Butterfly weed is also the larval food plant of the Queen butterfly.

Identification

The plant looks similar to the Lanceolate milkweed (Asclepias lanceolata), however the Butterfly weed is uniquely identified by the larger number of flowers and hairy stems that are not milky when broken. It is most commonly found in fields with dry soil.

Other common names

Canada-root, Chiggerflower, Indian posy, Orange-root, Orange swallowwort, Tuberroot, Whiteroot, Windroot, Yellow or Orange milkweed.

Subspecies indicated

• Asclepias tuberosa interior, Central United States.
• Asclepias tuberosa rolfsii (Rolfs Milkweed), Southeast United States.
• Asclepias tuberosa tuberosa, Eastern United States.

Gallery

• Entire plant from the ground to the flower

  Entire plant from the ground to the flower

• A young leaf

  A young leaf

• An emerging flower head

  An emerging flower head

• A flower head closeup

  A flower head closeup

• Closeup showing unopened, opening, and fully opened flower buds

  Closeup showing unopened, opening, and fully opened flower buds

• "Hello Yellow"

  "Hello Yellow"

• File:Asclepias tuberosa0.jpg

External links

• Butterfly weed brief information and pictures
• USDA information
• A Wikimanual of Gardening: Asclepias tuberosa
• Missouri Botanical Garden Asclepias tuberosa (native plant without Milky Stems)
• Missouri Botanical Garden Asclepias tuberosa 'Hello Yellow' (cultivar with Milky Stems)

References

• Peterson, Roger Tory (1968). A Field Guide to Wildflowers of Northeastern and North-central North America. Boston: Houghton Mifflin Company. ISBN 0-395-18325-1.

• Photo of a J.J. Audubon Plate Clay-Colored Sparrow perched atop Asclepias tuberosa