Native Plants

Spiked Ipomopsis

Ipomopsis spicata robruthii

USDA symbol: IPSPR3

perennial forb

Lower 48 states: native

If you’re a native plant enthusiast always on the lookout for something truly special, you might have stumbled across Ipomopsis spicata robruthii, commonly known as spiked ipomopsis. But before you start planning where to plant this Wyoming native, there are some important things you should know about this elusive perennial. ...

Spiked Ipomopsis may be listed as rare in your area.
Global Conservation Status

Status: S5T2 | Secure: At low or no risk of extinction in the area due to an extensive range, abundant populations, and with little to no concern of declines or threats.

Spiked Ipomopsis: A Rare Wyoming Native Worth Knowing About

If you’re a native plant enthusiast always on the lookout for something truly special, you might have stumbled across Ipomopsis spicata robruthii, commonly known as spiked ipomopsis. But before you start planning where to plant this Wyoming native, there are some important things you should know about this elusive perennial.

What Makes This Plant Special (and Scarce)

Spiked ipomopsis holds a Global Conservation Status of S5T2, which puts it in the rare category. This isn’t your everyday garden center find – it’s a genuinely uncommon plant that deserves our attention and protection. As a perennial forb (that’s botanist-speak for a non-woody flowering plant), it represents a unique piece of Wyoming’s natural heritage.

Where You’ll Find It in the Wild

This particular variety of spiked ipomopsis calls Wyoming home and, as far as current records show, that’s about it for its native range. It’s what we call an endemic – a plant that’s found in a very specific geographic area and nowhere else naturally.

  • Species observed
  • No observations

The Growing Challenge: What We Don’t Know

Here’s where things get a bit tricky for us gardening enthusiasts. Unlike many well-documented native plants, spiked ipomopsis remains somewhat of a mystery when it comes to cultivation details. We don’t have solid information about:

  • Specific growing conditions it prefers
  • USDA hardiness zones
  • Mature size and growth rate
  • Pollinator relationships
  • Propagation methods
  • Care requirements

Should You Grow It?

The short answer is: proceed with extreme caution and responsibility. Given its rare status, if you’re determined to grow spiked ipomopsis, you absolutely must source it responsibly. This means:

  • Never collecting from wild populations
  • Only purchasing from reputable native plant nurseries that propagate their own stock
  • Ensuring any seeds or plants are ethically sourced
  • Contributing to conservation rather than exploitation

Better Alternatives to Consider

Since spiked ipomopsis is both rare and poorly understood in cultivation, you might want to consider other Ipomopsis species that are better documented and more readily available. Many of these relatives offer similar beauty and ecological benefits without the conservation concerns.

Look for other native Wyoming wildflowers that can give you that high-elevation, western charm in your garden while being more sustainable choices for home cultivation.

The Bottom Line

Spiked ipomopsis represents the fascinating complexity of our native flora – some plants remain mysterious even in our information age. While its rarity makes it intriguing, it also means we need to approach it with respect and caution. If you encounter this plant in the wild during your Wyoming adventures, consider yourself lucky to witness something truly special, and please leave it undisturbed for future generations to discover.

For most of us, appreciating spiked ipomopsis means supporting conservation efforts and choosing well-documented native alternatives for our gardens. Sometimes the most responsible way to love a plant is to let it thrive in its natural habitat while we learn more about its needs and ecology.

Ipomopsis spicata robruthii is also known as...

Often we refer to plants by their common names. When shopping for plants the scientific name is the best way to positively identify the plant species you desire. But some plants have more than one name! While it doesn't happen often, nurseries might display one name while you're searching for another. Ipomopsis spicata robruthii is also known as:

Ipomopsis spicata Grant ssp. robruthiorum Wilken & , orth. var. | USDA symbol: IPSPR
Ipomopsis spicata Grant var. robruthiorum Dorn, orth. var. | USDA symbol: IPSPR2
Ipomopsis spicata Grant var. robruthii | USDA symbol: IPSPR4

Why do some plants have more than one name? Over time plant species may be renamed for a few reasons:

  1. Botanists in different regions named the same plant without knowing it had already been classified.
  2. A species was reclassified after scientific advances in, for example, DNA analysis.
  3. Slight variations within a species are sometimes mistakenly identified as entirely new species.

Classification

Group: Dicot
Kingdom: Plantae - Plants
Subkingdom: Tracheobionta - Vascular plants
Superdivision: Spermatophyta - Seed plants
Division: Magnoliophyta - Flowering plants
Class: Magnoliopsida - Dicotyledons
Subclass: Asteridae
Order: Solanales
Family: Polemoniaceae Juss. - Phlox family
Genus: Ipomopsis Michx. - ipomopsis

Species: Ipomopsis spicata (Nutt.) V.E. Grant - spiked ipomopsis

Subspecies: Ipomopsis spicata (Nutt.) V.E. Grant ssp. robruthii Wilken & R.L. Hartm. - spiked ipomopsis

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