North America Non-native Plant

Rorippa Portoricensis Var. Pumilum

Botanical name: Rorippa portoricensis var. pumilum

USDA symbol: ROPOP

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

The Mysterious Rorippa portoricensis var. pumilum: A Botanical Enigma If you’ve stumbled upon the name Rorippa portoricensis var. pumilum in your plant research, you might be wondering what exactly this mysterious species is all about. Well, you’re not alone in your curiosity – this particular variety is something of a ...

The Mysterious Rorippa portoricensis var. pumilum: A Botanical Enigma

If you’ve stumbled upon the name Rorippa portoricensis var. pumilum in your plant research, you might be wondering what exactly this mysterious species is all about. Well, you’re not alone in your curiosity – this particular variety is something of a botanical puzzle that even seasoned plant enthusiasts rarely encounter.

What We Know (And Don’t Know)

Rorippa portoricensis var. pumilum belongs to the mustard family (Brassicaceae) and is classified as a dicot. Beyond this basic botanical classification, however, reliable information about this specific variety is surprisingly scarce. There’s no widely recognized common name, and details about its appearance, growing habits, and distribution remain elusive in standard botanical literature.

The Challenge of Obscure Varieties

This lack of information isn’t necessarily unusual in the plant world. Many botanical varieties, especially regional or historical classifications, can become lost in taxonomic revisions or may represent extremely localized populations. Some possibilities for this mysterious status include:

  • The variety may have been reclassified under a different name
  • It could represent an extremely rare or extinct population
  • The classification might be outdated or regional
  • It may be synonymous with a more commonly known species

What This Means for Gardeners

Given the lack of available information about Rorippa portoricensis var. pumilum, it’s not a plant you’re likely to find at your local nursery or even through specialized native plant suppliers. Without clear data on its growing requirements, hardiness zones, or even its native status, it would be nearly impossible to successfully cultivate this variety.

Alternative Considerations

If you’re interested in the Rorippa genus (watercress and related species), there are better-documented alternatives that might satisfy your gardening interests. Many Rorippa species are associated with wetland environments and can be valuable additions to water gardens or naturally moist areas of the landscape.

Before pursuing any plant in the Rorippa genus, it’s worth researching well-documented species native to your region, as some members of this genus can have weedy tendencies in certain environments.

The Bottom Line

While Rorippa portoricensis var. pumilum remains an intriguing botanical name, the lack of reliable information makes it unsuitable for practical gardening purposes. If you encountered this name in research or historical documents, it’s best to consult with botanical experts or herbarium specialists who might be able to provide more context about this elusive variety.

For gardeners interested in supporting native biodiversity, focusing on well-documented native species with clear growing requirements and known ecological benefits will be far more rewarding and successful.

Rorippa Portoricensis Var. Pumilum

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

Capparales

Family

Brassicaceae Burnett - Mustard family

Genus

Rorippa Scop. - yellowcress

Species

Rorippa portoricensis (Spreng.) Stehlé - Puerto Rico yellowcress

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