North America Non-native Plant

Carmichaelia Williamsi

Botanical name: Carmichaelia williamsi

USDA symbol: CAWI11

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

Carmichaelia williamsi: An Elusive Native Plant Mystery If you’ve stumbled across the name Carmichaelia williamsi in your plant research, you’re not alone in wondering about this mysterious member of the legume family. This plant presents quite the puzzle for gardeners and botanists alike, as reliable information about this specific species ...

Carmichaelia williamsi: An Elusive Native Plant Mystery

If you’ve stumbled across the name Carmichaelia williamsi in your plant research, you’re not alone in wondering about this mysterious member of the legume family. This plant presents quite the puzzle for gardeners and botanists alike, as reliable information about this specific species is surprisingly scarce.

What We Know (And Don’t Know)

Carmichaelia williamsi belongs to the broader Carmichaelia genus, which is part of the pea family (Fabaceae). These plants are typically native to New Zealand and are known for their unique adaptations to harsh growing conditions. However, when it comes to the specific details about C. williamsi – including its common name, exact native range, and growing requirements – we find ourselves in somewhat uncharted territory.

The lack of widely available information about this particular species could indicate several possibilities: it might be an extremely rare plant, a recently described species, or potentially a name that’s not currently recognized in standard botanical references.

Geographic Distribution and Native Status

While we cannot pinpoint the exact geographic distribution of Carmichaelia williamsi, plants in the Carmichaelia genus are generally native to New Zealand. Without more specific information, we cannot provide a detailed native range for this particular species.

Should You Try to Grow It?

Here’s where things get tricky. Without reliable information about Carmichaelia williamsi’s growing requirements, hardiness zones, or even its availability in cultivation, it’s difficult to recommend this plant for your garden. If you’re interested in plants from the Carmichaelia genus, you might want to consider better-documented species that offer similar characteristics.

Alternative Options

If you’re drawn to the idea of growing a Carmichaelia species, consider researching other members of this fascinating genus that have more established cultivation information. Some Carmichaelia species are known for their:

  • Drought tolerance once established
  • Interesting leafless or reduced-leaf growth forms
  • Ability to fix nitrogen in the soil
  • Unique adaptations to challenging growing conditions

The Bottom Line

Carmichaelia williamsi remains something of an enigma in the plant world. While the mystery surrounding this plant is intriguing, the lack of reliable growing information makes it a challenging choice for most gardeners. If you’re specifically interested in this plant, we’d recommend consulting with botanical experts or specialized native plant societies who might have more detailed knowledge about rare or obscure species.

For now, this plant serves as a good reminder that the botanical world still holds many secrets, and sometimes the most interesting plants are also the most elusive ones!

Carmichaelia Williamsi

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Rosidae

Order

Fabales

Family

Fabaceae Lindl. - Pea family

Genus

Carmichaelia R. Br. - carmichaelia

Species

Carmichaelia williamsi Kirk

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