Calflora, a 501c3 non-profit
Distribution by County   751    
Asclepias speciosa  Torr.
Showy milkweed
Asclepias speciosa is a perennial herb that is native to California, and also found elsewhere in North America and beyond.
Record Count by County

Alameda: 6 Humboldt: 19 Napa: 3 Siskiyou: 37
Alpine: 10 Inyo: 36 Nevada: 26 Solano: 10
Amador: 14 Lake: 18 Placer: 11 Sonoma: 10
Butte: 37 Lassen: 16 Plumas: 57 Sutter: 5
Calaveras: 6 Madera: 4 Sacramento: 13 Tehama: 9
Colusa: 15 Marin: 4 San Francisco: 1 Trinity: 45
Contra Costa: 10 Mariposa: 29 San Mateo: 2 Tulare: 6
El Dorado: 18 Mendocino: 17 Santa Clara: 3 Tuolumne: 19
Fresno: 14 Modoc: 4 Shasta: 39 Yolo: 14
Glenn: 8 Mono: 32 Sierra: 16 Yuba: 3

Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria. [web application]. 2024. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 11/21/2024).