hairy woodsorrel

Oxalis pilosa

Member of common yellow woodsorrels (section Corniculatae)
palmate-leaved oxalis (subgenus Oxalis)
woodsorrels (genus Oxalis)
woodsorrel family (family Oxalidaceae)
dicots (class Magnoliopsida)
yellow in flowering plants

---

• stem erect to decumbent, < 40 cm, rooting at nodes or not, hairs 0.7–1.2 mm, dense, generally spreading
• leaves cauline
• leaflets < 1.5 cm, appressed-hairy
• inflorescence: 1–3-flowered; pedicel < 2 cm, hairs dense, generally spreading, occasionally appressed
• sepals 3.5–6 mm, lanceolate, tips ciliate
• petals generally 8–12 mm, yellow

Toxicity of fire fern, lady's sorrel, oxalis, sorrel, shamrock (Oxalis spp.):
2b – These plants contain oxalate crystals but they do not cause immediate problems. These plants have tiny crystals that lodge in the kidneys and can cause kidney damage as well as nausea, vomiting and diarrhea.

---

Chris’s observations: 2 (1 is research grade)

Locations:

• El Corte de Madera OSP
• Mt. Madonna SP

Months:

• May: 1
• Jun.: 0
• Jul.: 1

For more details, use advanced search.

---

Taxon info: iNaturalist – Calflora – CalPhotos – Jepson eFlora – FNA

Bay Area species: iNaturalist – Calflora