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Montana Field Guide

Montana Field Guides

Slender Phlox - Microsteris gracilis
Other Names:  Phlox gracilis

Native Species

Global Rank: G5
State Rank: S4S5

Agency Status
MNPS Threat Rank:
C-value: 3

External Links

General Description
Taprooted annual. Stems erect, simple or branched, 2–30 cm. Herbage glabrate, glandular-puberulent on the stems. Leaves sessile, entire, opposite below, alternate above, lanceolate to oblanceolate, 5–35 mm long. Inflorescence loose to glomerate, of single or paired flowers at branch tips. Flowers 5-merous; calyx 5–9 mm long with hyaline intercostal membranes; corolla, salverform, the tube white to yellow, 7–10 mm long, the lobes white to deep pink and 1–3 mm long; stamens included in the tube, unequally inserted with filaments shorter than the anthers. Capsule 3–5 mm long with 1 seed per locule (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
BC to CA, MT, CO, Mexico and South America.

Observations in Montana Natural Heritage Program Database
Number of Observations: 118

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Often disturbed soil of grasslands, steppe, woodlands, rock outcrops, forest openings; plains, valleys, montane (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

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Citation for data on this website:
Slender Phlox — Microsteris gracilis.  Montana Field Guide.  .  Retrieved on , from