North America Native Plant

Roundfruit Sedge

Botanical name: Carex deweyana var. collectanea

USDA symbol: CADEC

Life cycle: perennial

Habit: grass

Native status: Native to Canada  

Roundfruit Sedge: A Rare Canadian Native Worth Protecting If you’re a plant enthusiast with a passion for rare native species, you might have stumbled across Carex deweyana var. collectanea, commonly known as roundfruit sedge. This isn’t your typical garden center find – in fact, it’s one of those botanical treasures ...

Rare plant alert!

Region: Conservation status by state

Status: S5T1: Status is uncertain but is somewhere between the following rankings: Subspecies or variety is 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) ⚘ Secure: At very low or no risk of extinction in the jurisdiction due to a very extensive range, abundant populations or occurrences, with little to no concern from declines or threats. ⚘

Roundfruit Sedge: A Rare Canadian Native Worth Protecting

If you’re a plant enthusiast with a passion for rare native species, you might have stumbled across Carex deweyana var. collectanea, commonly known as roundfruit sedge. This isn’t your typical garden center find – in fact, it’s one of those botanical treasures that’s so rare, most gardeners will never encounter it in the wild, let alone in cultivation.

What Makes Roundfruit Sedge Special?

Roundfruit sedge (Carex deweyana var. collectanea) is a perennial sedge native to Canada, specifically found in Quebec. As a member of the sedge family (Cyperaceae), it’s part of that wonderful group of grass-like plants that add texture and movement to natural landscapes. Think of sedges as the sophisticated cousins of grasses – they’ve got that same graceful, flowing quality but with their own unique personality.

Where Does It Call Home?

This particular variety has an extremely limited range, being documented only in Quebec, Canada. Its restricted distribution is part of what makes it so special – and so vulnerable.

The Rarity Factor: Why This Matters

Here’s where things get serious. Roundfruit sedge has a Global Conservation Status of S5T1, which indicates it’s extremely rare. This isn’t just hard to find at the nursery rare – this is we need to be really careful about this plant’s survival rare. For gardeners, this means that while the plant might be fascinating from a botanical perspective, conservation should be our top priority.

Should You Grow Roundfruit Sedge?

The short answer is: probably not, unless you’re working with conservation organizations or botanical institutions. Here’s why:

  • Its extreme rarity means it should be protected in its natural habitat
  • Removing plants from wild populations could harm already vulnerable populations
  • Seeds or plants should only be sourced through legitimate conservation programs
  • Most home gardeners would be better served by more common native sedges

Better Alternatives for Your Garden

If you’re drawn to the idea of growing native sedges (and you should be – they’re fantastic!), consider these more readily available options that won’t put rare species at risk:

  • Other Carex species that are more common in your region
  • Locally native sedges recommended by your regional native plant society
  • Sedges propagated by reputable native plant nurseries

Supporting Conservation Instead

Rather than trying to grow this rare beauty in your garden, consider supporting conservation efforts in other ways:

  • Donate to organizations working to protect rare plant habitats
  • Participate in citizen science projects that monitor rare plant populations
  • Choose more common native plants for your landscape
  • Advocate for habitat protection in areas where rare plants are found

The Bigger Picture

Roundfruit sedge represents something important in the native gardening world – the delicate balance between our desire to grow interesting plants and our responsibility to protect vulnerable species. While we can’t have this particular sedge in our gardens, we can honor what it represents by making thoughtful choices about the native plants we do grow.

Sometimes the best way to appreciate a rare plant is to leave it where it belongs – in its native habitat, contributing to the ecosystem it evolved with, and hopefully thriving for future generations to discover and protect.

Roundfruit Sedge

Classification

Group

Monocot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Liliopsida - Monocotyledons

Subclass

Commelinidae

Order

Cyperales

Family

Cyperaceae Juss. - Sedge family

Genus

Carex L. - sedge

Species

Carex deweyana Schwein. - Dewey sedge

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