North America Native Plant

Bear Mountain Milkweed

Botanical name: Asclepias scaposa

USDA symbol: ASSC9

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Bear Mountain Milkweed: A Rare Southwestern Native Worth Investigating If you’ve stumbled across the name Bear Mountain milkweed (Asclepias scaposa), you’re likely dealing with one of the more mysterious members of the milkweed family. This perennial native has caught the attention of plant enthusiasts, but finding reliable information about it ...

Bear Mountain Milkweed: A Rare Southwestern Native Worth Investigating

If you’ve stumbled across the name Bear Mountain milkweed (Asclepias scaposa), you’re likely dealing with one of the more mysterious members of the milkweed family. This perennial native has caught the attention of plant enthusiasts, but finding reliable information about it can be quite the treasure hunt!

Where Does Bear Mountain Milkweed Call Home?

Bear Mountain milkweed is native to the lower 48 states, specifically found in New Mexico and Texas. This limited geographic distribution already hints at why this plant is such an enigma in the gardening world.

The Mystery Plant Challenge

Here’s where things get interesting (and a bit frustrating for us plant nerds): reliable, detailed information about Asclepias scaposa is surprisingly scarce. While we know it’s a perennial milkweed native to the Southwest, many of the typical details gardeners want to know remain elusive.

This scarcity of information could mean a few things:

  • It’s an extremely rare species with limited study
  • It might be a regional name or variant that’s not widely recognized
  • The species identification may need verification

What We Can Reasonably Expect

Based on its membership in the Asclepias family, Bear Mountain milkweed likely shares some common traits with its better-known cousins:

  • Produces the characteristic milky sap that gives milkweeds their name
  • Likely supports monarch butterflies and other pollinators
  • Probably adapted to the hot, dry conditions of its native Southwest range
  • May have the typical milkweed flower clusters, though color and size remain unknown

Should You Plant It?

Here’s my honest take: if you’ve encountered this plant or think you want to grow it, proceed with curiosity but also caution. The limited information available makes it difficult to provide solid growing advice, and you’ll want to be absolutely sure of the plant’s identity first.

If you’re in New Mexico or Texas and interested in native milkweeds, consider these well-documented alternatives:

  • Antelope Horn milkweed (Asclepias asperula)
  • Green milkweed (Asclepias viridis)
  • Butterfly weed (Asclepias tuberosa)

The Bottom Line

Bear Mountain milkweed represents one of those fascinating plant mysteries that remind us how much we still don’t know about our native flora. If you believe you’ve encountered this species, consider reaching out to local botanical experts, native plant societies, or university extension services for help with proper identification.

Sometimes the most interesting plants are the ones that keep their secrets close to their vest. Until we know more about Asclepias scaposa, it remains an intriguing piece of the southwestern botanical puzzle – one that’s definitely worth investigating further!

Bear Mountain Milkweed

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Gentianales

Family

Asclepiadaceae Borkh. - Milkweed family

Genus

Asclepias L. - milkweed

Species

Asclepias scaposa Vail - Bear Mountain milkweed

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA