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

Date: July 21, 2013. Location: Rochester prairie (map)

BONAP, FNA, ITIS, USDA, VPI

Scientific Name: Asclepias verticillata (In Greek mythology Asclepius was the god of healing. verticillata = whorled)

Common Name: Whorled milkweed

Origin: Native; perennial

Notes: This is a small milkweed which at maturity is usually less than 2 feet tall—often they are about knee high. They are found in prairies, roadsides and woods usually in dry sandy soils.

Additional references: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16.

Field Marks for Identification:

Flowers: July; small white flowers (about 6 mm long), occasionally purple tinted, horns slightly flattened and longer than hoods; fruit is a narrow follicle (pod); each seed with a tuft of silky hairs (the coma) which aids in wind dispersal

Leaves: long, slender, pointed, and stalkless blades arraigned in whorls on the upright stem

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

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