North America Native Plant

Florida Diamondflowers

Botanical name: Stenaria nigricans var. floridana

USDA symbol: STNIF

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Synonyms: Hedyotis nigricans (Lam.) Fosberg var. floridana (Standl.) Wunderlin (HENIF)  âš˜  Hedyotis purpurea (L.) Torr. & A. Gray var. floridana (Standl.) Fosberg (HEPUF)  âš˜  Houstonia floridana Standl. (HOFL)  âš˜  Houstonia nigricans (Lam.) Fernald var. floridana (Standl.) Terrell (HONIF)   

Florida Diamondflowers: A Rare Native Gem Worth Knowing About If you’re a Florida native plant enthusiast always on the hunt for something truly special, you might want to learn about Florida diamondflowers (Stenaria nigricans var. floridana). This little-known perennial herb represents one of those botanical treasures that makes Florida’s plant ...

Rare plant alert!

Region: Conservation status by state

Status: S5T2: 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) ⚘ 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. ⚘

Florida Diamondflowers: A Rare Native Gem Worth Knowing About

If you’re a Florida native plant enthusiast always on the hunt for something truly special, you might want to learn about Florida diamondflowers (Stenaria nigricans var. floridana). This little-known perennial herb represents one of those botanical treasures that makes Florida’s plant diversity so fascinating—though it comes with some important considerations for responsible gardeners.

What Are Florida Diamondflowers?

Florida diamondflowers are a perennial forb herb, meaning they’re non-woody plants that come back year after year. As a forb, this plant lacks the significant woody tissue you’d find in shrubs or trees, instead growing as a soft-stemmed herbaceous plant. You might also encounter this plant listed under several historical names, including Houstonia floridana or various Hedyotis species names—botanical classification has quite the history with this one!

Where Do They Grow Naturally?

Here’s where things get interesting: Florida diamondflowers are endemic to Florida, meaning they naturally occur nowhere else in the world. This makes them a true Florida original and adds to their special status among native plant enthusiasts.

A Word of Caution: Rarity Matters

Before you get too excited about adding these to your garden, there’s something important to know. Florida diamondflowers have a Global Conservation Status of S5T2, indicating they have a specific rarity ranking that deserves our respect. This means if you’re interested in growing them, you should only source plants or seeds from reputable native plant nurseries that propagate them responsibly—never collect from wild populations.

Growing Florida Diamondflowers: The Challenge

Here’s where we hit a bit of a roadblock. Detailed growing information for this specific variety is quite limited, which isn’t uncommon for rare native plants that haven’t made their way into mainstream horticulture. What we do know is that as a Florida native perennial, they’re likely suited for USDA hardiness zones that encompass Florida’s climate range.

Should You Grow Them?

The honest answer? It’s complicated. Here are the key considerations:

  • For conservation: Growing rare natives can help preserve genetic diversity, but only when done responsibly
  • For uniqueness: You’d have a true Florida endemic in your garden
  • The challenges: Limited growing information and sourcing difficulties make this a plant for dedicated native plant gardeners

Alternative Florida Native Options

If Florida diamondflowers prove too elusive, consider these related Florida natives that are easier to source and grow:

  • Other Houstonia species that may be more readily available
  • Small Florida wildflowers with similar delicate appeal
  • Native groundcovers that provide similar ecological benefits

The Bottom Line

Florida diamondflowers represent the kind of botanical treasure that makes Florida’s native flora so special. While they’re not a plant for every gardener due to rarity and limited cultivation information, they’re worth knowing about as part of Florida’s unique natural heritage. If you do encounter them through responsible sources, you’d be participating in the conservation of a truly special piece of Florida’s botanical puzzle.

Remember, the best native gardening practices always prioritize responsible sourcing and respect for rare species—sometimes the greatest gift we can give a rare plant is simply knowing it exists and protecting its wild habitat.

Florida Diamondflowers

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

Rubiales

Family

Rubiaceae Juss. - Madder family

Genus

Stenaria Raf. ex Steud. - diamond-flowers

Species

Stenaria nigricans (Lam.) Terrell - diamond-flowers

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