Pineleaf Milkweed.
Asclepias linaria, Milkweed Family: ( Asclepiadaceae ), Pineleaf Milkweed. Also called: Threadleaf Milkweed, Pine Needle Butterfly Weed, Mexican Milkweed.

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Asclepias linaria is a good xeriscape landscaping plant in arizona and it is considered a small to medium evergreen perennial shrub; green in color, it has leaves resembling pine tree needles.

Some consider the plant a succulant.

Butterflies are attracted to it. Especially Monarchs.

Quick Notes:

Height: Evergreen succculant shrub growing to 2 - 5 feet tall and about 4 feet wide.

Flowers: The flowers are in clusters that are white in color.

Flowering Time: April - November.

seeds: They bear a 2 inch long, seed tear shaped, seed capsule.

Leaves: Linear, pine needle-like leaves densely line the stems.

Found: The USDA claims it is native to the USA (AZ, CA, NM). It is also native to northwestern Mexico. Chihuahua, Sonora, Baja Norte, & Baja California.

Hardiness:
USDA Zone 9b: to -3.8 �C (25 �F)
USDA Zone 10a: to -1.1 �C (30 �F)
USDA Zone 10b: to 1.7 �C (35 �F)

Soil pH requirements:
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
7.9 to 8.5 (alkaline)

Sun Exposure:
Full Sun
Light Shade

Elevation: 0 - 3,000 Feet.

Habitat: Desert washes, creosote bush scrub. An ideal xeriscape landscape plant in Arizona.

Miscellaneous: Maintenance: Low.