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Slender Yellow Woodsorrel

Oxalis dillenii

A field-guide profile of Slender Yellow Woodsorrel, covering recognition, range context, soil ecology, community discovery, and source-backed cautions.

  • low perennial woodsorrel
  • native from central and eastern Canada to eastern Mexico, introduced in parts of Europe and elsewhere
  • Slender Yellow Woodsorrel carries tiny seed launchers above its clover-like leaves.
Slender Yellow Woodsorrel showing three heart-shaped leaflets.
Image: Clarence A. Rechenthin, USDA NRCS · Public domain

At a glance

  • Typelow perennial woodsorrel
  • Rangenative from central and eastern Canada to eastern Mexico, introduced in parts of Europe and elsewhere
  • Field markthree heart-shaped leaflets
  • SafetyObserve without treating this page as use advice
Range & community finds

Where it grows in the wild

Slender Yellow Woodsorrel is treated here with conservative range language: native from central and eastern Canada to eastern Mexico, introduced in parts of Europe and elsewhere. The public map shows reported observations and does not claim to be a complete habitat map.14

Field marks

How to recognize it

Use several traits together before trusting a quick name match.

Three Heart-Shaped Leaflets

Three Heart-Shaped Leaflets helps separate Slender Yellow Woodsorrel from similar plants when it is checked with the whole plant and setting.

Small Yellow Flowers

Small Yellow Flowers helps separate Slender Yellow Woodsorrel from similar plants when it is checked with the whole plant and setting.

Upright Five-Angled Seed Capsules

Upright Five-Angled Seed Capsules helps separate Slender Yellow Woodsorrel from similar plants when it is checked with the whole plant and setting.

Don't mix it up

Lookalikes & how to tell them apart

Look-alikes are common enough that one trait is rarely enough.

Common yellow woodsorrel

Compare leaves, flowers, fruits, and habitat together.. This similar plant can share part of the same visual vocabulary, so check multiple field marks before treating the identification as settled.

Creeping woodsorrel

Compare leaves, flowers, fruits, and habitat together.. This similar plant can share part of the same visual vocabulary, so check multiple field marks before treating the identification as settled.

The story

Seed launchers tucked above sour leaves

Slender Yellow Woodsorrel sits low in lawns and path edges, with yellow flowers above clover-like leaflets and seed capsules held like tiny spring cases. Slender Yellow Woodsorrel carries tiny seed launchers above its clover-like leaves.

The first community record in this profile began in AR, United States, on 2026-06-21. That record gives the page a human starting point without turning the plant into a private location. From there, the eye can move back to the plant itself: three heart-shaped leaflets, small yellow flowers, upright five-angled seed capsules. Those details matter because quick green shapes can mislead, especially around Common yellow woodsorrel and Creeping woodsorrel.

Range adds another layer to the story. Slender Yellow Woodsorrel is described here as native from central and eastern Canada to eastern Mexico, introduced in parts of Europe and elsewhere. The map on this page is an observation map, so it shows reported records rather than a promise that the plant is absent anywhere else. For a field reader, that is useful humility. It says, in effect, that a plant has both a history and a pattern of being noticed.

A second look often changes the scale of the plant. What first appears as one weed, one flower, or one clump becomes a set of choices made by the site: where water lingers, where bare soil opened, where insects can land, and where seeds can leave. That is why the profile keeps returning to leaves, flowers, fruits, and soil together. The name is useful, but the setting explains why the plant is there at all.

The soil gives the plant its working stage. Lawns, pastures, roadsides, maintained ground, and open disturbed soil give it enough space to branch low. Explosive capsules move seeds away from the parent plant, a small mechanical answer to crowded ground. In that sense, Slender Yellow Woodsorrel is a spring-loaded seed flicker of lawns and edges: visible aboveground, but shaped by moisture, disturbance, light, roots, and the small animals or people that move seeds through a place.

There is also a caution built into the profile. Oxalis plants contain oxalates, so sour-taste folklore is treated as cautionary context and not as eating advice. That keeps the page useful for families and students without turning recognition into permission. Notice the plant, photograph it, and compare several features before naming it.

In the field, pause at the edge rather than grabbing the first close-up. Look for three heart-shaped leaflets, then check small yellow flowers and upright five-angled seed capsules. Step back and ask what the ground is doing: wet or dry, shaded or open, compacted or loose, crowded or newly disturbed. A small plant often tells the larger story of the path, pasture, woodland edge, or ditch around it.

Ecology

Its place in the ecological web

The strongest profile of Slender Yellow Woodsorrel includes the organisms and ground conditions around it.

Ecological web

Seasonal visitors and seed movement

Explosive capsules move seeds away from the parent plant, a small mechanical answer to crowded ground.12

Soil

Soil & ground connection

Lawns, pastures, roadsides, maintained ground, and open disturbed soil give it enough space to branch low.2

Timing

When to look

Slender Yellow Woodsorrel is most visible across April, May, June, July, August, September in much of its range, with local timing shifting by climate and site.2

Leaves
Flowers
  • Peak bloom
  • Fading & dried heads
  • Leaves out
In Leafari

Found one? Keep a field journal

Save this species to your journal, earn its badge, and see community discoveries on an approximate, privacy-safe map.

  1. 1First community record is shown at state or province scale.
  2. 2Exact discovery coordinates and private photos stay out of public content.
Slender Yellow Woodsorrel community badge art.

Slender Yellow Woodsorrel

Earned when you identify this species in Leafari.

In the Leafari community

1Total finds logged
1Explorers journaled it

First found in AR, United States, by Clever-Collector-2

References

Sources

Key facts and claims trace back to a named reference. Superscript numbers in the text link here.

  1. Plants of the World Online: Oxalis dillenii
  2. Flora of the Southeastern United States: Oxalis dillenii
  3. Go Botany: Oxalis dillenii
  4. GBIF species match: Oxalis dillenii
  5. Leafari app records product-snapshot