Page author: David Giblin
Microsteris gracilis
slender phlox
Note the terminal (at tips of branch or stem) flowers with a yellow tube and 5 pinkish lobes. The glandular-hairy nature of this plant can be seen along the stems and leaves.
Note the branched stems arising from the taproot of this annual.
WTU specimens
Other herbaria

Distribution: Widely distributed throughout Washington; Alaska south to California, east to the Rocky Mountains and the Great Plains in the U.S.

Habitat: Lowlands and foothills in open, dry to moderately moist places.

Flowers: March-June

Origin: Native

Conservation Status: Not of concern

Description:
General:

Simple to multi-branched, taprooted annual to 30 cm. tall. Plants hairy to hairy-glandular, at least on the upper half. Highly variable in appearance.

Leaves:

Lower leaves opposite, upper leaves alternate. Leaves linear to elliptic in shape, to 5 cm. long. and 8 mm. wide.

Flowers:

Usually in pairs at the tips of stems and branches. One flower often attached by a slender stalk (pedicel), the other attached nearly directly to the stem or branch (subsessile). Each 5-15 mm. long flower composed of a fused tube that is white or yellowish, with 5 lavender to pink lobes that are separate from each other.

Fruits:

Capsule.

Accepted Name:
Microsteris gracilis (Hook.) Greene
Publication: Pittonia 3: 300. 1898.

Synonyms & Misapplications:
Gilia gracilis Hook.
Gilia gracilis Hook. var. humilior (Hook.) H. St. John
Microsteris gracilis (Hook.) Greene ssp. humilis (Greene) Brand
Microsteris gracilis (Hook.) Greene var. gracilis [HC, IMF4]
Microsteris gracilis (Hook.) Greene var. humilior (Hook.) Cronquist [HC, IMF4]
Microsteris humilis Greene
Microsteris micrantha (Kellogg) Greene
Phlox gracilis (Hook.) Greene
Phlox gracilis (Hook.) Greene ssp. gracilis [KZ99, JPM]
Phlox gracilis (Hook.) Greene ssp. humilis (Greene) H. Mason [KZ99]
Phlox gracilis (Hook.) Greene var. humilior (Hook.) B. Boivin
Additional Resources:

PNW Herbaria: Specimen records of Microsteris gracilis in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Microsteris gracilis checklist entry.

E-Flora BC: Microsteris gracilis atlas page.

CalPhotos: Microsteris gracilis photos.

USDA Plants: Microsteris gracilis information.

66 photographs:
Group by