North America Native Plant

Santa Catalina Burstwort

Botanical name: Hermannia pauciflora

USDA symbol: HEPA13

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Santa Catalina Burstwort: Arizona’s Mysterious Native Wildflower If you’ve never heard of Santa Catalina burstwort, you’re not alone. This enigmatic Arizona native is one of those plants that makes botanists scratch their heads and gardeners wonder if they’re chasing a ghost. Let’s dive into what we know about this elusive ...

Rare plant alert!

Region: Conservation status by state

Status: S2?: Status is uncertain but is somewhere between the following rankings: Inexact rank: ⚘ 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) ⚘

Santa Catalina Burstwort: Arizona’s Mysterious Native Wildflower

If you’ve never heard of Santa Catalina burstwort, you’re not alone. This enigmatic Arizona native is one of those plants that makes botanists scratch their heads and gardeners wonder if they’re chasing a ghost. Let’s dive into what we know about this elusive perennial and why it might be one of the most challenging native plants you’ll ever encounter.

What Exactly Is Santa Catalina Burstwort?

Santa Catalina burstwort (Hermannia pauciflora) is a perennial forb native to Arizona. As a forb, it’s essentially a wildflower – a non-woody plant that lacks the substantial stems of shrubs or trees. Think of it as nature’s version of a herbaceous perennial, with soft, green growth that dies back seasonally while the root system persists year after year.

What makes this plant particularly fascinating is how little we actually know about it. In the botanical world, some plants are like celebrities – everyone knows them, grows them, and talks about them. Santa Catalina burstwort is more like that mysterious neighbor who keeps to themselves.

Where Does It Call Home?

This native wildflower is found exclusively in Arizona, making it a true regional specialty. Its limited geographic distribution is part of what makes it so intriguing – and so rare. When a plant is found in only one state, it often indicates very specific habitat requirements or evolutionary adaptations to particular environmental conditions.

The Rarity Factor: Why This Matters

Here’s where things get serious. Santa Catalina burstwort carries a Global Conservation Status of S2?, which in conservation terms means its status is undefined but potentially at risk. This ranking suggests the plant may be imperiled, with populations that could be vulnerable to extinction.

For gardeners, this rarity status comes with important responsibilities. If you’re interested in growing native Arizona plants, this species should be approached with extreme caution – if at all.

Should You Grow Santa Catalina Burstwort?

The short answer is: probably not, and here’s why.

First, finding legitimate seeds or plants would be nearly impossible through normal gardening channels. The rarity of this species means it’s not commercially available, and collecting from wild populations could potentially harm already vulnerable communities of this plant.

Second, we simply don’t have enough information about its growing requirements to give you reliable guidance. Without knowing its preferred soil conditions, water needs, light requirements, or companion plants, attempting to grow it would be a shot in the dark.

Better Alternatives for Arizona Native Gardens

Instead of chasing this botanical mystery, consider these wonderful Arizona natives that are easier to source and grow:

  • Desert marigold (Baileya multiradiata) – cheerful yellow blooms
  • Penstemon species – tubular flowers loved by hummingbirds
  • Brittlebush (Encelia farinosa) – drought-tolerant with daisy-like flowers
  • Desert lupine (Lupinus arizonicus) – striking purple flower spikes

The Bigger Picture

Santa Catalina burstwort represents something important in the native plant world – the reminder that not every native species is suitable for home cultivation. Some plants are meant to remain wild, existing in their natural habitats where they’ve evolved specific relationships with their environment.

As native plant gardeners, we can appreciate these rare species from afar while focusing our efforts on growing the many other Arizona natives that are both available and well-suited to garden life. Sometimes the best way to honor a native plant is to leave it in peace and support conservation efforts that protect its natural habitat.

If you’re passionate about rare Arizona flora, consider supporting local botanical gardens, native plant societies, or conservation organizations that work to protect these special species in their natural environments. That’s where Santa Catalina burstwort belongs – in the wild landscapes of Arizona, keeping its secrets and continuing its mysterious existence.

Santa Catalina Burstwort

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Dilleniidae

Order

Malvales

Family

Sterculiaceae Vent. - Cacao family

Genus

Hermannia L. - hermannia

Species

Hermannia pauciflora S. Watson - Santa Catalina burstwort

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