Overview

Asclepias eriocarpa, commonly called woollypod milkweed, Indian milkweed or Kotolo, is a perennial herbaceous member of the milkweed group. It belongs to the subfamily Asclepiadoideae and is placed in the genus Asclepias. This species is native to parts of the western United States, where it typically occupies open, dry sites. The plant is noted for its clustered, crown-like flowers and the distinctive hairy, woolly follicles that follow flowering.

Identification and characteristics

A. eriocarpa generally produces erect stems with opposite leaves that may be covered in hairs. The inflorescences are spherical to rounded clusters of small, star-shaped flowers with a prominent corona typical of milkweeds; flower color can range through shades of pink, rose and purple. After pollination the plant forms elongated, fuzzy seed pods that split to release flat seeds equipped with silky hairs for wind dispersal. The milky sap contains bitter or toxic compounds common in milkweeds.

Distribution and habitat

This species occurs in dry, open landscapes such as slopes, chaparral, scrub, dry grassland and sometimes disturbed sites with well-drained soils. It is most often encountered in the western United States, including regions with Mediterranean-type climates and interior arid areas. Typical habitats are often described as dry, barren habitats or xeric shrublands where competition from more moisture-demanding plants is limited.

Ecology and interactions

Like other milkweeds, A. eriocarpa provides nectar to a variety of pollinators, including bees, flies and butterflies, and can serve as a larval host for some Lepidoptera. Its specialized floral structure encourages pollination by insects able to access the corona and pollinia. The plant's sap contains cardiac glycosides and related compounds that deter many herbivores; these chemicals can also be sequestered by some specialist insects as a defense.

Uses, cultivation and caution

Woollypod milkweed is sometimes included in native-plant gardens and restoration projects aimed at supporting pollinators and drought-tolerant landscapes. It is valued for its attractive flower clusters and wind-dispersed seeds which help recolonize open areas. Propagation is typically by seed or by transplanting nursery-grown plants adapted to dry soils. Because the sap is toxic, handling and use for food or medicine is discouraged without specific traditional knowledge; historical uses of various milkweeds for fiber or cultural purposes vary among peoples.

Conservation and management

Conservation attention for native milkweeds focuses on protecting habitat, maintaining open sunny sites, and avoiding overgrazing or heavy development that eliminates populations. In landscapes where it occurs naturally, plant communities that include A. eriocarpa contribute to pollinator networks and to the resilience of dry ecosystems. Local floras and conservation agencies provide region-specific guidance on propagation, management and any legal protections.

Taxonomy and notes

  • The species name, eriocarpa, alludes to the woolly or hairy nature of the seed pods.
  • As a member of the genus Asclepias, it shares many reproductive and chemical traits with other milkweeds.
  • For identification, compare floral corona shape, leaf hairiness and the distinctive woolly follicles when distinguishing it from other milkweeds in the region.

For further reading consult regional plant guides, herbarium records and authoritative databases that cover the flora of the western United States. Habitat descriptions and species pages often use terms such as dry, barren habitats to denote the typical conditions where this milkweed is found. Additional taxonomic and distributional information is available through specialist sources and botanical references on plant diversity; see also curated species records under Asclepias eriocarpa and genus-level summaries at Asclepias resources.