North America Native Plant

Rattlesnakemaster

Botanical name: Eryngium aquaticum var. ravenelii

USDA symbol: ERAQR

Life cycle: biennial

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Eryngium aquaticum L. var. floridanum (J.M. Coult. & Rose) Mathias & Constance (ERAQF)  âš˜  Eryngium floridanum J.M. Coult. & Rose (ERFL14)  âš˜  Eryngium ravenelii A. Gray (ERRA10)   

Rattlesnakemaster: A Rare Southeastern Native Worth Protecting Meet Eryngium aquaticum var. ravenelii, commonly known as rattlesnakemaster – a fascinating native plant that’s as intriguing as its name suggests. This spiky-flowered beauty is a true southeastern treasure, though one that deserves our careful attention and respect. What Makes Rattlesnakemaster Special? Despite ...

Rare plant alert!

Region: Conservation status by state

Status: S4T2T3: Status is uncertain but is somewhere between the following rankings: Subspecies or variety is 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) ⚘ Subspecies or variety is vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals. ⚘ Apparently Secure: Uncommon but not rare, and usually widespread. Possibly cause for longterm concern. Typically more than 100 occurrences in the state or more than 10,000 individuals ⚘

Rattlesnakemaster: A Rare Southeastern Native Worth Protecting

Meet Eryngium aquaticum var. ravenelii, commonly known as rattlesnakemaster – a fascinating native plant that’s as intriguing as its name suggests. This spiky-flowered beauty is a true southeastern treasure, though one that deserves our careful attention and respect.

What Makes Rattlesnakemaster Special?

Despite its intimidating name, rattlesnakemaster is actually a biennial forb – meaning it’s an herbaceous plant that completes its life cycle over two years. Don’t let the lack of woody stems fool you; this plant brings serious architectural interest to any native garden with its distinctive, thistle-like appearance.

This particular variety goes by several scientific names throughout history, including Eryngium floridanum and Eryngium ravenelii, showing just how much botanists have appreciated (and occasionally been confused by) this unique plant.

Where Does Rattlesnakemaster Call Home?

This native beauty has a relatively limited range, naturally occurring in just four southeastern states: Florida, Georgia, North Carolina, and South Carolina. Its specific distribution makes it a true regional specialty plant.

A Word of Caution: Rarity Matters

Here’s where things get important – rattlesnakemaster carries a Global Conservation Status of S4T2T3, indicating some level of conservation concern. While this shouldn’t discourage you from growing it, it does mean we need to be responsible gardeners.

If you’re interested in adding this plant to your landscape, please ensure you’re purchasing from reputable native plant nurseries that propagate their stock rather than wild-collecting. Never collect this plant from the wild, and always choose nurseries that can verify their propagation practices.

Why Consider Rattlesnakemaster for Your Garden?

Despite the limited specific information available about this particular variety, rattlesnakemaster offers several compelling reasons to include it in your native plant collection:

  • True native status supports local ecosystems
  • Unique architectural form adds structural interest
  • Biennial lifecycle provides changing garden dynamics
  • Likely pollinator benefits (typical of Eryngium species)
  • Regional specialization makes it a conversation starter

Growing Rattlesnakemaster: What We Know

Unfortunately, specific cultivation information for Eryngium aquaticum var. ravenelii is quite limited in available resources. Based on its native range in the southeastern coastal states, it likely thrives in USDA hardiness zones 8-10.

As a biennial forb, expect this plant to focus on vegetative growth in its first year, then flower and set seed in its second year before completing its lifecycle. This growth pattern means patience is key – but the reward is worth the wait.

Garden Design and Landscape Role

Rattlesnakemaster would likely work best in:

  • Native plant gardens focused on southeastern species
  • Naturalized areas and meadow plantings
  • Wildlife gardens supporting native pollinators
  • Collections of rare or unusual native plants

The Bottom Line

Rattlesnakemaster represents both an opportunity and a responsibility. While its rarity status means we should approach it thoughtfully, its native heritage and unique characteristics make it a worthy addition to appropriate southeastern gardens.

If you’re passionate about native plants and have experience with less common species, this rattlesnakemaster variety could be a meaningful addition to your collection. Just remember to source responsibly, be patient with its biennial nature, and appreciate that you’re helping preserve a piece of southeastern botanical heritage.

Given the limited cultivation information available, consider connecting with local native plant societies or botanical gardens in Florida, Georgia, North Carolina, or South Carolina for region-specific growing advice. These local experts may have hands-on experience with this particular variety that can help ensure your success.

Rattlesnakemaster

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

Apiales

Family

Apiaceae Lindl. - Carrot family

Genus

Eryngium L. - eryngo

Species

Eryngium aquaticum L. - rattlesnakemaster

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