North America Non-native Plant

Shacklette’s Cryptantha

Botanical name: Cryptantha shackletteana

USDA symbol: CRSH6

Life cycle: perennial

Habit: subshrub

Native status: Non-native, reproduces and persists in the wild in Alaska  

Synonyms: Cryptantha shacklettiana Higgins, orth. var. (CRSH)   

Shacklette’s Cryptantha: A Rare and Mysterious Alaskan Introduction Meet Shacklette’s cryptantha (Cryptantha shackletteana), one of Alaska’s most enigmatic plant species. This little-known perennial herb has quite the story – it’s not native to Alaska, yet somehow found its way there and decided to make itself at home. But before you ...

Rare plant alert!

Region: Conservation status by state

Status: S1Q: Status is uncertain but is somewhere between the following rankings: Uncertain taxonomy: ⚘ Critically Imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 5 or fewer occurrences or very few remaining individuals (<1,000) ⚘

Shacklette’s Cryptantha: A Rare and Mysterious Alaskan Introduction

Meet Shacklette’s cryptantha (Cryptantha shackletteana), one of Alaska’s most enigmatic plant species. This little-known perennial herb has quite the story – it’s not native to Alaska, yet somehow found its way there and decided to make itself at home. But before you start planning where to plant it in your garden, there are some important things you should know about this botanical mystery.

What Exactly Is Shacklette’s Cryptantha?

Shacklette’s cryptantha is a perennial forb – that’s botanist-speak for a non-woody plant that comes back year after year. Like other plants in its family, it lacks the thick, woody stems you’d find on shrubs or trees, instead growing as a herbaceous plant with softer stems and leaves.

You might occasionally see this plant listed under a slightly different spelling – Cryptantha shacklettiana – but don’t worry, it’s the same species. Sometimes plant names get tweaked over time as botanists refine their understanding.

Where Does It Come From?

Here’s where things get interesting (and a bit puzzling). Shacklette’s cryptantha is found only in Alaska, but it’s not actually native there. Somehow, this plant species was introduced to Alaska and has managed to establish itself in the wild, reproducing on its own without human help. Where it originally came from remains something of a mystery – its true native range isn’t clearly documented.

The Rarity Factor: Why You Should Think Twice

Before you get excited about adding this unique plant to your collection, pump the brakes a bit. Shacklette’s cryptantha has a Global Conservation Status of S1Q, which indicates it’s extremely rare and its status is somewhat uncertain. This rarity raises some important considerations:

  • The plant may be difficult or impossible to source ethically
  • Its specific growing requirements are poorly understood
  • Removing specimens from wild populations could harm already fragile populations
  • Success in cultivation is uncertain due to limited horticultural knowledge

Growing Shacklette’s Cryptantha: The Great Unknown

If you’re hoping for detailed growing instructions, you’re going to be disappointed. Because this species is so rare and poorly studied, we simply don’t have reliable information about its preferred growing conditions, hardiness zones, care requirements, or propagation methods. This isn’t necessarily a reflection of the plant being difficult to grow – we just don’t know enough about it to say either way.

What we do know is that it’s managed to establish itself in Alaska’s challenging climate, suggesting it might be tougher than it appears. But without more specific information, attempting to grow it would be largely guesswork.

Should You Grow It?

Given the rarity status and lack of available information, most gardeners should probably skip Shacklette’s cryptantha. If you’re absolutely determined to try growing it, only consider doing so with seeds or plants that have been responsibly sourced – never collected from wild populations.

Native Alternatives Worth Considering

Instead of puzzling over this mysterious species, why not explore some of the wonderful native plants in your own region? Native plants offer numerous benefits:

  • They’re adapted to local growing conditions
  • They support local wildlife and pollinators
  • They typically require less water and maintenance once established
  • Growing information is more readily available

Check with your local native plant society or extension office for recommendations of native species that would thrive in your specific area.

The Bottom Line

Shacklette’s cryptantha remains one of botany’s intriguing puzzles – a rare species with an uncertain origin story, found only in Alaska despite not being native there. While its mystery might appeal to plant collectors and botanical enthusiasts, its rarity and our limited understanding of its needs make it an impractical choice for most gardeners.

Sometimes the most responsible thing we can do as gardeners is to admire rare plants from afar while focusing our growing efforts on species we can cultivate successfully and sustainably. Your garden – and the environment – will thank you for choosing well-understood native plants that truly belong in your local ecosystem.

Shacklette’s Cryptantha

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

Lamiales

Family

Boraginaceae Juss. - Borage family

Genus

Cryptantha Lehm. ex G. Don - cryptantha

Species

Cryptantha shackletteana Higgins - Shacklette's cryptantha

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