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Asclepias angustifolia
Also called Inmortal, Narrow Leaved Milkweed
Asclepias angustifolia, commonly called the Arizona milkweed, is a species of milkweed native in the USA only in Arizona.
The Arizona milkweed is commercially available by both seed and propagated plants. Seed readily germinates, and mature flowering plants can be grown in as little as three months. Plants can be successfully grown in containers as small as a quart. This species is tolerant of excess watering and lack of watering, in which substrate has not been seen to be an important factor in growth. Substrates utilized have been both organic-rich and replacement to sandy loam profiles. Cold hardiness has been noted to −12 °C (10 °F).
Found at higher elevations (around 1,050 to 2,100 metres [3,440 to 6,890 ft]), it is known in the USA only from Pima, Santa Cruz, and Cochise counties in Arizona, United States. Native substrate mostly consists of dry rocky soils. Habit includes riparian woodlands, floodplain meadows, cienega edges, canyons, and arroyo bottoms. It is considered rare in Arizona, and restricted to the borderlands. This species is a known host plant to the Monarch Butterfly. Because it serves as a nesting ground for the Monarch's larvae, it is a vital component in preventing the extinction of these butterflies. It has been observed to be pollinated by small species of Carpenter Bees (Ceratina sp.).
Cartwheels · Cartwheels · Whitestem milkweed · Asclepias alpestris · Asclepias amabilis · Asclepias ameliae · Clasping milkweed · Asclepias apocynifolia · Sand milkweed · Spider milkweed · Asclepias atroviolacea · Golden Star Drops
Text excerpted from the Wikipedia article Asclepias angustifolia by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
