North America Native Plant

Diamondflowers

Botanical name: Stenaria nigricans var. nigricans

USDA symbol: STNIN

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Synonyms: Chamisme angustifolia (Michx.) Nieuwl. (CHAN6)  âš˜  Gentiana nigricans Lam. (GENI2)  âš˜  Hedyotis nigricans (Lam.) Fosberg (HENI4)  âš˜  Hedyotis nigricans (Lam.) Fosberg var. austrotexana B.L. Turner (HENIA2)  âš˜  Hedyotis nigricans (Lam.) Fosberg var. filifolia (Chapm.) Shinners (HENIF2)  âš˜  Hedyotis nigricans (Lam.) Fosberg var. nigricans (HENIN)  âš˜  Hedyotis nigricans (Lam.) Fosberg var. pulvinata (Small) Fosberg (HENIP)  âš˜  Hedyotis nigricans (Lam.) Fosberg var. papillacea B.L. Turner (HENIP3)  âš˜  Hedyotis nigricans (Lam.) Fosberg var. rigidiuscula (A. Gray) Shinners (HENIR)  âš˜  Hedyotis nigricans (Lam.) Fosberg var. scabra (S. Watson) Fosberg (HENIS)  âš˜  Hedyotis salina (A. Heller) Shinners (HESA7)  âš˜  Houstonia angustifolia Michx. (HOAN2)  âš˜  Houstonia angustifolia Michx. var. filifolia (Chapm.) A. Gray (HOANF)  âš˜  Houstonia angustifolia Michx. var. rigidiuscula A. Gray (HOANR)  âš˜  Houstonia filifolia (Chapm.) Small (HOFI3)  âš˜  Houstonia nigricans (Lam.) Fernald (HONI)  âš˜  Houstonia nigricans (Lam.) Fernald var. pulvinata (Small) Terrell (HONIP)  âš˜  Houstonia pulvinata Small (HOPU6)  âš˜  Houstonia rigidiuscula (A. Gray) Wooton & Standl. (HORI2)  âš˜  Houstonia salina A. Heller (HOSA3)  âš˜  Houstonia tenuis Small (HOTE6)  âš˜  Oldenlandia angustifolia (Michx.) A. Gray (OLAN)  âš˜  Oldenlandia angustifolia (Michx.) A. Gray var. filifolia Chapm. (OLANF)   

Diamondflowers: A Native Perennial Worth Knowing Meet diamondflowers (Stenaria nigricans var. nigricans), a native perennial that might not be on every gardener’s radar, but deserves a closer look. This delicate forb herb represents one of those hidden gems in the native plant world – the kind of species that makes ...

Rare plant alert!

Region: Conservation status by state

Status: S5T2?: Status is uncertain but is somewhere between the following rankings: Inexact rank: ⚘ 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. ⚘ 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. ⚘ 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. ⚘ 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. ⚘

Region: Conservation status by state

Region: Conservation status by state

Diamondflowers: A Native Perennial Worth Knowing

Meet diamondflowers (Stenaria nigricans var. nigricans), a native perennial that might not be on every gardener’s radar, but deserves a closer look. This delicate forb herb represents one of those hidden gems in the native plant world – the kind of species that makes you feel like you’ve discovered a botanical secret.

What Exactly Are Diamondflowers?

Diamondflowers are native perennial herbs that belong to a group of plants without significant woody tissue above ground. Think of them as the quiet, understated members of the native plant community – they may not command attention like a bold sunflower, but they have their own subtle charm and ecological importance.

This species goes by the botanical name Stenaria nigricans var. nigricans, though it has had quite the identity crisis over the years with numerous synonyms including various Hedyotis and Houstonia classifications. Botanists sure do love their name changes!

Where Do Diamondflowers Call Home?

These native beauties have quite an impressive range across the lower 48 states. You can find diamondflowers naturally occurring in Alabama, Arkansas, Colorado, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Michigan, Mississippi, Missouri, Nebraska, New Hampshire, New Mexico, Ohio, Oklahoma, South Carolina, Tennessee, Texas, and Virginia. That’s nearly half the country – talk about well-traveled!

Should You Plant Diamondflowers in Your Garden?

Here’s where things get a bit tricky. While diamondflowers are undoubtedly native and have an extensive natural range, they appear to be somewhat uncommon in cultivation. The conservation status information suggests they may have varying levels of rarity in different regions, which could mean a few things:

  • They might be naturally rare or declining in some areas
  • They could be habitat specialists with specific growing requirements
  • They may simply be overlooked by the gardening community

If you’re interested in growing diamondflowers, proceed thoughtfully. Make sure any plants or seeds you acquire are responsibly sourced – never collect from wild populations, and always purchase from reputable native plant nurseries that can verify their stock’s origins.

The Growing Challenge

Unfortunately, specific growing information for diamondflowers is limited in readily available sources. This isn’t uncommon for lesser-known native species that haven’t made it into mainstream horticulture. What we do know is that as a native forb herb, they likely prefer conditions similar to their natural habitats across their wide range.

If you’re determined to try growing diamondflowers, your best bet is to:

  • Contact local native plant societies in your area
  • Reach out to botanical gardens or universities with native plant programs
  • Connect with specialized native plant nurseries
  • Observe the species in local natural areas to understand their preferred conditions

A Plant for the Dedicated Native Gardener

Diamondflowers represent the kind of native species that appeals to dedicated native plant enthusiasts – those gardeners who appreciate the full spectrum of native biodiversity, not just the showiest species. While they may not offer the dramatic blooms of purple coneflowers or the architectural presence of native grasses, they contribute to the complex web of native plant communities.

If you’re just starting your native gardening journey, you might want to begin with better-documented native species that are readily available in the nursery trade. But if you’re an experienced native gardener looking for something unique, diamondflowers could be an intriguing project – just remember to source them responsibly and be prepared for some detective work to figure out their growing preferences.

Sometimes the most rewarding gardening experiences come from working with the lesser-known species, the ones that make you feel like you’re contributing to conservation efforts right in your own backyard. Diamondflowers just might be one of those special plants worth the extra effort.

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