North America Native Plant

Pseudorontium

Botanical name: Pseudorontium

USDA symbol: PSEUD24

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Pseudorontium: A Mysterious Native Annual Worth Knowing About If you’ve stumbled across the name pseudorontium in your native plant research, you’re not alone in scratching your head. This little-known native annual is one of those plants that flies under the radar, yet deserves a spot in our conversation about American ...

Pseudorontium: A Mysterious Native Annual Worth Knowing About

If you’ve stumbled across the name pseudorontium in your native plant research, you’re not alone in scratching your head. This little-known native annual is one of those plants that flies under the radar, yet deserves a spot in our conversation about American flora.

What Exactly Is Pseudorontium?

Pseudorontium is a native annual forb—basically a soft-stemmed herbaceous plant that completes its entire life cycle in just one growing season. Unlike woody shrubs or trees, this plant lacks significant woody tissue and dies back completely each year, relying on seeds to continue its lineage.

As a forb, pseudorontium fits into that wonderful category of non-grassy flowering plants that often provide some of the most interesting textures and seasonal interest in native gardens. Think wildflowers, but in a more botanical sense.

Where Does Pseudorontium Call Home?

This native plant has a fairly limited range within the United States, naturally occurring in just two states: Arizona and California. This southwestern distribution suggests it’s adapted to the unique climate conditions of these regions.

The Challenge with Growing Pseudorontium

Here’s where things get a bit tricky for the home gardener. While pseudorontium is definitely a legitimate native plant, detailed growing information is surprisingly scarce. We know it’s an annual and we know where it grows naturally, but specifics about:

  • Preferred soil conditions
  • Water requirements
  • Sun exposure needs
  • Germination requirements
  • Mature size and appearance

…are largely undocumented in readily available horticultural sources.

Should You Try Growing It?

If you’re gardening in Arizona or California and you’re passionate about growing truly local native species, pseudorontium might be worth investigating further. However, given the lack of cultivation information, it’s definitely not a beginner-friendly choice.

Your best bet would be to contact local native plant societies, botanical gardens, or university extension offices in Arizona or California. They might have more detailed knowledge about this particular species and whether seeds or plants are available from ethical sources.

Better-Documented Native Alternatives

If you’re looking for native annual forbs for your southwestern garden, consider these well-documented alternatives:

  • Desert marigold (Baileya multiradiata)
  • Ghost plant (Graptopetalum paraguayense)
  • Chia (Salvia hispanica)
  • Desert lupine (Lupinus sparsiflorus)

These plants offer the same native credentials with the added benefit of established growing guides and seed availability.

The Importance of Obscure Natives

Plants like pseudorontium remind us that our native flora includes countless species that haven’t made it into mainstream horticulture. While we may not have detailed growing guides for every native plant, each species plays a role in its ecosystem and represents part of our natural heritage.

Sometimes the best thing we can do for these lesser-known natives is to protect their existing habitat and support organizations working to document and preserve our full spectrum of native plants.

Have you encountered pseudorontium in the wild or know more about growing it? We’d love to hear from fellow native plant enthusiasts who might have experience with this intriguing annual!

Pseudorontium

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

Scrophulariales

Family

Scrophulariaceae Juss. - Figwort family

Genus

Pseudorontium (A. Gray) Rothm. - pseudorontium

Species

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