Asclepias viridis

green antelopehorn, green milkweed, antelopehorn, spider milkweed
Family

Asclepiadaceae

Leaf Arrangement

alternate

Leaf Attachment

petiolate

Leaf Margin

entire

Leaf Type

simple

Leaf Shape

oblong, lanceolate, ovate

Growth Form

forb

Flower Color

green, purple

Flower Month

March - September

Height (meters)

0.6 - 0.9

Milky Sap

Yes

Armed/Unarmed

Unarmed

Origin

native

Lifespan

perennial

Growing Season

Warm season


Prairie Coefficient of Conservatism

4

Field Characters

Pale green flowers, leaves that are smooth underneath and hoods bent abruptly away from the anther.

Cultural Information

Requires full sun, although it will tolerate some shade. It is easily propagated by seed and the seed requires no treatment. The pods split 4-6 weeks after flowering and the seeds should be kept in the pod until ripe. Fresh seed may be sown immediately. The germination of stored seed improves with cold/moist stratification (Steffen 1997). Seeds average approximately 140,000 seed/lb and the recommended planting rate is 25 lbs/acre. Blooms in 1-2 years from seed.Stem cuttings can be taken during the growing season, dipped in rooting harmone, and rooted in sand or potting soil.

Animal Use

Larval host plant of monarch butterflies. Charles Robertson, 1928: (Insects suck nectar; limited information; this observation is from Moure & Hurd) Bees (short-tongued) Halictidae (Halictinae): Augochlorella striata (MH)

Natural History

All milkweeds are called "herb 'a houatte" by Acadians and is thought to be a variation of "ouate" or "cotton wool". This name may refer to the use of its seed silk as down (Holmes 1990).

Habitat

Prairies and dry places.