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Asclepias viridiflora Raf.
Green milkweed, Green comet milkweed, Green antelopehorn milkweed
Synonym(s): Acerates viridiflora, Acerates viridiflora var. ivesii, Acerates viridiflora var. linearis, Asclepias viridiflora var. lanceolata, Asclepias viridiflora var. linearis
USDA Symbol: asvi
USDA Native Status: L48 (N), CAN (N)
Green milkweed is a perennial from a vertical rootstock. Two foot tall stems are mostly solitary or in pairs and bear are opposite leaves up to four inches long. Leaves are variable in shape with plants from dry sites having long narrow leaves and those from moist sites having round leaves. 20-80 pale green flowers occur in two inch clusters in upper leaf axils. The pods of green milkweed are about four inches long and pointed at both ends. The pods lack the warts or tubercles found on other common milkweeds.
The specific epithet viridiflora means green-flowered in botanical Latin. Milkweed flowers have a special mechanism to trap insect legs and cause pollen masses to be pulled from the plant.
Bloom InformationBloom Color: Green
Bloom Time: Jun , Jul , Aug , Sep
, WY Canada: AB
Growing ConditionsWater Use: Low
Light Requirement: Sun
Soil Moisture: Dry
All plants in the genus
Asclepias are probably somewhat toxic, some fatally so, to both humans and animals. The sap
of some causes skin irritation in humans. Sensitivity to a toxin varies with a personís age, weight, physical condition, and individual susceptibility. Children are most vulnerable because of their curiosity and small size. Toxicity can vary in a plant according to season, the plantís different parts, and its stage of growth; and plants can absorb toxic substances, such as herbicides, pesticides, and pollutants from the water, air, and soil. Conspicuous Flowers:
Record Last Modified: 2012-06-26
Research By: TWC Staff