North America Non-native Plant

Narrowleaf Water-starwort

Botanical name: Callitriche intermedia intermedia

USDA symbol: CAINI6

Habit: forb

Native status: Not native but doesn't reproduce and persist in the wild

Narrowleaf Water-Starwort: A Mysterious Aquatic Native If you’ve ever been curious about those delicate, star-shaped plants floating in quiet ponds or slow-moving streams, you might have encountered narrowleaf water-starwort (Callitriche intermedia intermedia). This petite aquatic forb belongs to a fascinating group of plants that have mastered the art of living ...

Narrowleaf Water-Starwort: A Mysterious Aquatic Native

If you’ve ever been curious about those delicate, star-shaped plants floating in quiet ponds or slow-moving streams, you might have encountered narrowleaf water-starwort (Callitriche intermedia intermedia). This petite aquatic forb belongs to a fascinating group of plants that have mastered the art of living both above and below the waterline.

What Exactly Is Narrowleaf Water-Starwort?

Narrowleaf water-starwort is a herbaceous forb, which means it’s a soft-stemmed plant without woody tissue. Like many aquatic plants, it’s adapted to life in and around water, forming those characteristic rosettes that look like tiny green stars scattered across the water’s surface.

The truth is, this particular subspecies is somewhat of an enigma in the gardening world. While water-starworts as a group are well-known to aquatic plant enthusiasts, specific information about Callitriche intermedia intermedia is surprisingly scarce in horticultural literature.

Where Does It Come From?

The geographical distribution of this specific subspecies remains unclear in available resources. Water-starworts in general are found across various regions, but without concrete data on this particular variety’s native range, it’s difficult to make definitive recommendations about its appropriateness for different gardens.

Should You Grow Narrowleaf Water-Starwort?

Here’s where things get a bit tricky. Without clear information about this plant’s native status, invasive potential, or specific growing requirements, it’s challenging to give a wholehearted recommendation either way. However, here’s what we can consider:

  • If you’re interested in aquatic gardening, water-starworts can add delicate texture to water features
  • They typically prefer shallow, slow-moving or still water
  • These plants can provide habitat for aquatic wildlife
  • Their small size makes them suitable for smaller water gardens

A Word of Caution

Given the limited information available about this specific subspecies, we’d recommend proceeding with caution. If you’re interested in adding aquatic plants to your water garden, consider working with:

  • Local native plant societies to identify appropriate aquatic natives for your region
  • Reputable aquatic plant suppliers who can provide guidance on suitable species
  • Your local extension office for recommendations on water garden plants

The Bottom Line

While narrowleaf water-starwort might sound intriguing, the lack of specific horticultural information about Callitriche intermedia intermedia makes it difficult to provide concrete growing advice. If you’re drawn to aquatic plants, there are many well-documented native alternatives that can provide similar aesthetic appeal with known benefits to local ecosystems.

Sometimes the most responsible approach to gardening is knowing when to say let’s research this more – and this appears to be one of those times. Your local water garden experts will be your best resource for finding the perfect aquatic plants for your specific situation.

Narrowleaf Water-starwort

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

Callitrichales

Family

Callitrichaceae Link. - Water-starwort family

Genus

Callitriche L. - water-starwort

Species

Callitriche intermedia Hoffm. - narrowleaf water-starwort

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