North America Non-native Plant

Senna Angulata

Botanical name: Senna angulata

USDA symbol: SEAN9

Native status: Not native but doesn't reproduce and persist in the wild

Synonyms: Cassia angulata Vogel (CAAN29)   

Senna angulata: A Mysterious Member of the Senna Family If you’ve stumbled across the name Senna angulata in your plant research, you might be wondering what exactly this species is all about. Well, you’re not alone in your curiosity! This particular member of the Senna genus is something of an ...

Senna angulata: A Mysterious Member of the Senna Family

If you’ve stumbled across the name Senna angulata in your plant research, you might be wondering what exactly this species is all about. Well, you’re not alone in your curiosity! This particular member of the Senna genus is something of an enigma in the gardening world, with limited information available about its characteristics and cultivation requirements.

What We Know About Senna angulata

Senna angulata belongs to the legume family and was formerly classified as Cassia angulata Vogel. Beyond this taxonomic information, specific details about this species are surprisingly scarce in horticultural literature. This lack of readily available information suggests it’s either not commonly cultivated or hasn’t been extensively studied for garden use.

The Challenge of Unknown Origins

One of the biggest mysteries surrounding Senna angulata is its native range and distribution. Without knowing where this plant naturally occurs, it’s impossible to determine whether it would be appropriate for native plant gardens or if it might pose any invasive risks in different regions.

Should You Plant Senna angulata?

Here’s where things get tricky. With so little information available about this species, it’s difficult to provide a clear recommendation. We don’t know:

  • Its hardiness zones or climate preferences
  • Whether it’s rare, common, or potentially problematic
  • Its mature size or growth habits
  • Its water and soil requirements
  • Its benefits to pollinators or wildlife

This lack of information is actually a red flag for most gardeners. When a plant species has limited cultivation information available, it often means it’s either very specialized, potentially problematic, or simply not well-suited for typical garden conditions.

A Safer Alternative Approach

If you’re interested in Senna species for your garden, consider exploring better-documented options instead. Many Senna species are known for their bright yellow flowers and ability to attract butterflies and other pollinators. Some well-studied alternatives include:

  • Native Senna species that are documented for your specific region
  • Senna species with established cultivation guidelines
  • Other leguminous plants with similar aesthetic appeal and known growing requirements

The Bottom Line

While Senna angulata might sound intriguing, the lack of comprehensive information about this species makes it a risky choice for most gardeners. Without knowing its native status, growing requirements, or potential impacts, it’s better to stick with well-documented plants that will give you predictable, positive results in your garden.

If you’re determined to learn more about this mysterious species, consider reaching out to botanical institutions or specialized plant societies who might have more detailed information. But for most gardening projects, you’ll find much better success with plants that come with clear growing instructions and known benefits!

Senna Angulata

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

Fabales

Family

Fabaceae Lindl. - Pea family

Genus

Senna Mill. - senna

Species

Senna angulata (Vogel) H.S. Irwin & Barneby

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