Asclepias angustifolia Schweigg.

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Asclepias angustifolia, commonly called the Arizona milkweed , is an endemic species of milkweed native only to Arizona.

Description

The Arizona milkweed is a cold-hardy herbaceous perennial that forms a taproot, growing to 60–90 cm (24–35 in) in height. The stems arise from a single crown, and can be many.

Leaves - opposite, linear with short petioles, glabrous, 4–12 cm (1.6–4.7 in) in length, 2–11 mm (0.079–0.433 in) in width; 

Inflorescence - 2–4 cm (0.79–1.57 in), erect umbel, single peduncle per node, with one or more peduncles per stem, typically borne towards the top of the stem; 

Flowers - 3 mm (0.12 in) in diameter and in length, pedicels 5 mm (0.20 in), horns extend beyond the hoods, corollas reflexed, flower color ranges from whitish to pink; 

Pods - slender, upright, 3.5–9 cm (1.4–3.5 in) long, containing few to many seeds; 

Seeds - ca. 4mm in length, attached to white silky coma c. 4 mm (0.16 in) in length.

Ecology

Found at higher elevations (around 1,050 to 2,100 metres [3,440 to 6,890 ft]), it is known 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.).

Asclepias angustifolia - Wikipedia

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