North America Native Plant

Riccia Ozarkiana

Botanical name: Riccia ozarkiana

USDA symbol: RIOZ

Habit: nonvascular

Native status: Native to North America  

Riccia ozarkiana: A Rare North American Liverwort Worth Knowing Meet Riccia ozarkiana, a tiny but fascinating member of the liverwort family that calls North America home. While you won’t find this little green gem at your local nursery, understanding what it is and where it fits in our native ecosystems ...

Rare plant alert!

Region: Conservation status by state

Status: S1S2: Status is uncertain but is somewhere between the following rankings: 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) ⚘ Imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 6 to 20 occurrences or few remaining individuals (1,000 to 3,000) ⚘

Riccia ozarkiana: A Rare North American Liverwort Worth Knowing

Meet Riccia ozarkiana, a tiny but fascinating member of the liverwort family that calls North America home. While you won’t find this little green gem at your local nursery, understanding what it is and where it fits in our native ecosystems can deepen your appreciation for the incredible diversity of plant life around us.

What Exactly Is a Liverwort?

Before we dive into the specifics of Riccia ozarkiana, let’s talk about what liverworts are. These aren’t your typical garden plants – they’re actually some of the oldest land plants on Earth! Liverworts are small, herbaceous plants that belong to a group called bryophytes, which also includes mosses and hornworts. Think of them as the quiet, unassuming cousins of the plant world that prefer to keep a low profile.

Unlike the flowering plants you’re used to, liverworts don’t produce showy blooms or towering stems. Instead, they form small, often flat, green structures that hug close to whatever surface they’re growing on.

The Rarity Factor

Here’s where things get interesting – and a bit concerning. Riccia ozarkiana has a Global Conservation Status of S1S2, which means it’s quite rare. This little liverwort is like finding a needle in a haystack, and that rarity makes it something special worth protecting rather than collecting.

If you’re lucky enough to encounter this species in the wild, it’s best to admire it from a distance and leave it undisturbed. Its rarity means every individual plant plays an important role in maintaining the species’ survival.

Where Does It Call Home?

Riccia ozarkiana is native to North America, though specific distribution details are limited due to its rarity. Like many liverworts, it’s likely to be found in specific microhabitats that provide just the right conditions for its survival.

Spotting This Elusive Liverwort

As a terrestrial liverwort, Riccia ozarkiana prefers to grow on solid surfaces rather than in soil. You might find it:

  • Clinging to rocks in moist areas
  • Growing on fallen logs or dead wood
  • Attached to other solid surfaces in humid environments

The key word here is might – remember, this is a rare species, so spotting one would be quite the botanical adventure!

Benefits to Your Garden Ecosystem

While you won’t be planting Riccia ozarkiana in your garden beds, liverworts like this one do play important ecological roles. They help with soil stabilization, provide microhabitats for tiny creatures, and contribute to the overall biodiversity of natural areas. In a broader sense, supporting the health of wild spaces where rare species like this liverwort live helps maintain the ecological balance that benefits all plants – including the ones in your garden.

What This Means for Native Gardeners

As native plant enthusiasts, we can appreciate Riccia ozarkiana for what it represents: the incredible diversity and complexity of North American flora. While we might not be able to grow this particular species, we can:

  • Support conservation efforts for rare native plants
  • Create garden conditions that support other native bryophytes
  • Maintain natural areas on our properties where rare species might find refuge
  • Learn to identify and appreciate the small, often-overlooked native plants around us

The Bigger Picture

Riccia ozarkiana might be small and rare, but it’s part of the vast tapestry of North American native flora. Every species, no matter how tiny or uncommon, has a role to play in our ecosystems. By understanding and appreciating plants like this liverwort, we become better stewards of our native landscapes and more thoughtful gardeners overall.

So while you won’t be adding Riccia ozarkiana to your shopping list, knowing about its existence reminds us that there’s always more to discover in the world of native plants – even if some discoveries are best left undisturbed in their natural homes.

Riccia Ozarkiana

Classification

Group

Liverwort

Kingdom

Plantae - Plants

Subkingdom
Superdivision
Division

Hepaticophyta - Liverworts

Subdivision

Hepaticae

Class

Hepaticopsida

Subclass

Marchantiae

Order

Marchantiales

Family

Ricciaceae Rchb.

Genus

Riccia L., nom. cons.

Species

Riccia ozarkiana McGregor

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