Page author: David Giblin
Sidalcea nelsoniana
Nelson's checker-mallow
WTU specimens
Other herbaria

Distribution: Occurring in southwest Washington; south in Willamette Valley of Oregon from Portland to Salem, west to Tillamook County.

Habitat: Gravelly, well-drained soil at low elevations.

Flowers: May-July

Origin: Native

Conservation Status: Endangered in Washington (WANHP)

Description:
General:

Herbaceous perennial from a stout taproot and short rhizome, glabrous to pubescent with short, stiff, appressed, simple hairs.

Leaves:

Leaves alternate, palmately veined, long petiolate, the lower rotund, shallowly lobed, the lobes with coarse, rounded teeth, the upper with 5-7 lobes to the base, the lobes linear and pointed.

Flowers:

Inflorescence an elongate, narrow raceme, many-flowered, the pedicels about 3 mm. long; calyx 5 lobed, 4-6 mm. long, purplish-tinged, sub-glabrous to thickly pubescent with stellate hairs; petals 5, pinkish-lavender, 5-15 mm. long, clawed, broadly obovate and notched; stamens 40-70, freed from the staminal tube in 2-3 series, the stamens united in groups; ovary superior, the carpels 5-10 in a ring around a central axis; styles equal to the number of carpels, elongate, stigmatic full length.

Fruits:

Fruit: Capsule 3 mm. long, with a beak less than 0.5 mm. long.

Accepted Name:
Sidalcea nelsoniana Piper
Publication: Proc. Biol. Soc. Wash. 32(12): 41. 1919.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Sidalcea nelsoniana in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Sidalcea nelsoniana checklist entry.

E-Flora BC: Sidalcea nelsoniana atlas page.

CalPhotos: Sidalcea nelsoniana photos.

USDA Plants: Sidalcea nelsoniana information.

19 photographs:
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