North America Native Plant

Yellow Milkwort

Botanical name: Polygala rugelii

USDA symbol: PORU5

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Pylostachya rugelii (Shuttlw. ex Chapm.) Small (PYRU)   

Yellow Milkwort: Florida’s Lesser-Known Native Wildflower Meet yellow milkwort (Polygala rugelii), one of Florida’s more mysterious native wildflowers. This annual forb might not be on every gardener’s radar, but it’s worth getting to know if you’re passionate about authentic Florida native plants. What Makes Yellow Milkwort Special? Yellow milkwort belongs ...

Yellow Milkwort: Florida’s Lesser-Known Native Wildflower

Meet yellow milkwort (Polygala rugelii), one of Florida’s more mysterious native wildflowers. This annual forb might not be on every gardener’s radar, but it’s worth getting to know if you’re passionate about authentic Florida native plants.

What Makes Yellow Milkwort Special?

Yellow milkwort belongs to the milkwort family and is classified as a forb – essentially a non-woody flowering plant that completes its life cycle in a single growing season. Unlike shrubs or trees, this plant lacks significant woody tissue and keeps its growing points right at or below ground level, making it a true herbaceous annual.

You might also see this plant referenced by its scientific synonym, Pylostachya rugelii, in older botanical literature, but Polygala rugelii is the currently accepted name.

Where Does Yellow Milkwort Call Home?

This little native is exclusively Floridian – you won’t find it naturally occurring anywhere else in the United States. While many native plants have expansive ranges spanning multiple states, yellow milkwort has chosen to keep things local, making it a true Florida endemic.

Growing Yellow Milkwort: What We Know

Here’s where things get interesting (and a bit challenging): yellow milkwort is one of those native plants that hasn’t received much attention in horticultural circles. What we do know is that it’s classified as a facultative wetland plant in the Atlantic and Gulf Coastal Plain region, which tells us something important about its preferences.

Wetland Connections

The facultative wetland designation means yellow milkwort usually grows in wetland environments but can occasionally pop up in drier areas too. If you’re planning a rain garden, bioswale, or natural wetland restoration project, this could be an authentic choice for your plant palette.

Should You Grow Yellow Milkwort?

This is where honesty comes in handy. While yellow milkwort is undoubtedly a legitimate Florida native with potential ecological value, practical growing information is scarce. Here’s what to consider:

  • Limited availability – you’re unlikely to find this at your local nursery
  • Unknown cultivation requirements beyond its wetland tendencies
  • Unclear ornamental value and garden performance
  • Potential value for specialized native plant enthusiasts and restoration projects

Alternative Native Options

If you’re drawn to native Florida wildflowers but want something with more established growing information, consider these well-documented alternatives:

  • Other Polygala species with known cultivation requirements
  • Native wetland plants like blue flag iris or swamp milkweed
  • Florida-friendly wildflowers with similar habitat preferences

The Bottom Line

Yellow milkwort represents the fascinating diversity of Florida’s native plant kingdom, even if it remains somewhat enigmatic from a gardening perspective. While it might not be the best choice for your first foray into native gardening, it could be perfect for advanced native plant enthusiasts working on specialized restoration projects or those with suitable wetland conditions.

If you do encounter seeds or plants through specialized native plant sources, approach growing yellow milkwort as an experimental adventure. Focus on providing consistently moist conditions and be prepared to learn through trial and observation – sometimes that’s the most rewarding part of native gardening!

Wetland Status

The rule of seasoned gardeners and landscapers is to choose the "right plant for the right place" matching plants to their ideal growing conditions, so they'll thrive with less work and fewer inputs. But the simplicity of this catchphrase conceals how tricky plant selection is. While tags list watering requirements, there's more to the story.

Knowing a plant's wetland status can simplify the process by revealing the interaction between plants, water, and soil. Surprisingly, many popular landscape plants are wetland species! And what may be a wetland plant in one area, in another it might thrive in drier conditions. Also, it helps you make smarter gardening choices and grow healthy plants with less care and feeding, saving you time, frustration, and money while producing an attractive garden with greater ecological benefits.

Regions
Status
Moisture Conditions

Atlantic and Gulf Coastal Plain

FACW

Facultative Wetland - Plants with this status usually occurs in wetlands but may occur in non-wetlands

Yellow Milkwort

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

Polygalales

Family

Polygalaceae Hoffmanns. & Link - Milkwort family

Genus

Polygala L. - polygala

Species

Polygala rugelii Shuttlw. ex Chapm. - yellow milkwort

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