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Asclepias engelmanniana - Engelmann's milkweed

Scientific Family
Asclepiadaceae
Synonyms
Acerates auriculata, Asclepias auriculata
Plant type
Forbs and Subshrubs
Origin
Native
Lifecycle
Perennial
Height
To 47 inches
Riparian
Yes

A tall, slender plant with drooping, narrow, linear leaves. Flowers are in umbels at leaf nodes along the stem.

Perennial herb with milky sap. Erect stems stout, typically unbranched. Leaves narrowly linear, irregularly alternate, smooth or slightly hairy. Small flowers are greenish-yellow, often tinged with purple and borne in hairy lateral umbels.

Habitat

Sandy, rocky or limestone soils. Creeks, canyons, open woodlands and open pine forests.

Plant Community
Montane Conifer Forest
Pinyon Juniper Woodlands
Riparian
Low elevation
4000
High elevation
7200

Flower Characteristics

The flower umbels are about 2 inches wide. The individual flowers have 5 pale greenish-white petals with purple tips and are about 3/8 inch wide. Hoods are broad, saclike, closely upright next to the central column.

Flower color
Pale green to yellow
Flower shape
Irregular
Tubular
No
First bloom month
June
Last bloom month
September
Flower clusters
Rounded

Leaf and Stem Characteristics

The narrow leaves are to 10 inches long and droop downward from the stem.

Leaf type
Simple
Leaf color
Green
Leaf shape
Narrow
Leaf margin
Smooth
Leaf attachment
Alternate
Leaves clasp
No
Leaf hairs
None
Spines
No

Fruit and Seed Characteristics

The fruit is a curved conical pod to 6 inches long with lengthwise wrinkles and a pointed tip. The greenish pod turns tan with age and contains many flat, dark brown seeds.

Fruit type
Pod
Fruit color
Green

Seeds have silk-like white hairs at one end that help to carry them away on the wind.