Participant Info

Species

Asclepias hallii

Family

Asclepiadaceae

CommonName

Hall’s milkweed

Presence

Yes

Status

native

EarliestDate

1888

LatestDate

2021

Ecosystem

shrubland, foothill, montane, ruderal, urban

Geobotanical

SSawatch, Garitas, SSanjuans, NCristos, UBasin

Counties

Alamosa, Conejos, Hinsdale, Mineral, Rio Grande, Saguache

Passes

WildlifePreserves

Coller, Rio Grande, San Luis Lakes

Other Localities

Del Norte

PhotoRecords

YES Rich Haswell: Saguache Co, 10 miles E of North Pass, 11 July 2015; Rio Grande Co, CR 630, 3 miles N of CR 15, 29 June 2021

Comments

Hall's milkweed is a locally common sight along roadsides around the Watershed. There is only one Basin record of it (10 miles N of Alamosa); the rest are from foothill and montane ecosystems. Sharples (2017) found it "uncommon" in the South San Juan Wilderness of Conejos and Archuleta counties. Its USA range is the lower mountain elevations of Wyoming, Colorado, Utah, Arizona, and Nevada. Allred et al. (2020) note that the single collection from New Mexico is from Colfax Co (on the border with Colorado), dated 1896.

Annotation