Narrowleaf Climbing Milkweed. Funastrum cynanchoides var. hartwegii, Milkweed Family ( Asclepiadaceae ), Narrowleaf Climbing Milkweed. Also called Fringed Twinevine, Climbing Milkweed. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. Narrowleaf Milkweed are perennials with milky juice and long twining stems 8 to 40 feet long, which reproduce by seeds and horizontal roots. The leaves are in pairs, thinly covered by short hairs to hairless. The various plants show remarkable variability in the size and shape of the mature leaves. They all have slender stalks, which vary in length from 1/16 inch to over 2 inches. The leaf blades are very narrow-1/16 inch-to very broad-1 3/4 inches. The leaf base may be narrowed to a point and taper into the stalk, or they may be rounded, or 2-angled, or heartshaped, or arrowshaped, or 2-lobed with the lobes pointing outward. They may be narrowed to a long slender point at the tip, or short pointed, or rounde with a point tip. They are 1/2 to 2 1/2 inches long. The flowers are in characteristic umbrellalike clusters, with 15 to 25 on a slender stalk arising at the leaf axil. They are fragrant, white, whitish yellow, or purple. The brown seedpods are l 1/2 to 3 1/2 inches long, 1/3 to 2/3 inch wide. The reddish brown seeds are 1/8 to 1/4 inch long, slightly toothed at the rounded end, with a tuft of soft silky hairs at the narrow end. Climbing milkweed is a native weed growing in dry sandy soil, and a nuisance around ranches, often climbing on fences, ditches, small trees and shrubs, and spreading into gardens and cultivated fields. Also common in desert washes and arroyos throughout southern and central Arizona; 100 to 5,500 feet elevation; flowering April to October; the seedpods persisting until November. Quick Notes: Height: Height to about 3 - 4 feet. Climbing. Flowers: The small flowers are fragrant, white, whitish yellow, or purple. They are on umbrellalike clusters, with 15 to 25 on a slender stalk arising at the leaf axil. Seed Pod: Brown seedpods l 1/2 to 3 1/2 inches long, 1/3 to 2/3 inch wide. Flowering Time: April to October. Leaves: Long narrow leaf blades, very narrow-1/16 inch. The leaves are in pairs, thinly covered by short hairs to hairless. They have slender stalks, which vary in length from 1/16 inch to over 2 inches. Found: Native to CA, southern UT, southern NM, southwestern TX; south in Mexico. to Baja C. Sur, Jal. and Qro. Found nearly throughout the state of Arizona, unrecorded only in Apache and Greenlee counties. Hardiness: USDA Zone 8a: to -12.2 �C (10 �F) USDA Zone 8b: to -9.4 �C (15 �F) USDA Zone 9a: to -6.6 �C (20 �F) 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) USDA Zone 11: above 4.5 �C (40 �F) Soil pH requirements: 5.6 to 6.0 (acidic) 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) 7.9 to 8.5 (alkaline) Sun Exposure: Full Sun Elevation: Can be found from 100 - 5,500 Feet.. Habitat: Sandy washes and dry sandy soil along roadsides, slopes, canyons, floodplains, disturbed sites. Miscellaneous: Flowering Photos Taken June 13, 2003. George Hawkins Ranch, Date Creek, Arizona.

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