Collomia linearis Nutt.


Collomia linearis plant

Family - Polemoniaceae

Stem - Erect, to 60 cm, pubescent with fine hairs especially toward tip.

Leaves - Alternate, simple, entire, sessile, with single midvein. Lower leaves linear to lanceolate. Upper stem leaves lanceolate to ovate, pointed at tip, bases somewhat clasping. Abaxial surface with short, often glandular hairs along midvein.

Collomia_linearis_stemStem and leaves.

Inflorescences - Terminal and axillary, headlike clusters surrounded by leafy bracts.

Collomia_linearis_inflorescence2Terminal inflorescence.

Collomia_linearis_inflorescenceAxillary inflorescences.


Calyx - 5-lobed to about midpoint, 4-7 mm long at flowering, elongating at fruiting, narrowly bell-shaped. Calyx lobes triangular, glandular-hairy.

Corolla - 5-lobed, white to pink, trumpet-shaped. Tube 8-15 mm long, lobes 1-4 mm long. Stamens unequal. Anthers mostly included.


Flowering - May - August.

Habitat - Pastures, open disturbed areas.

Origin - Native to the western U.S.

Other info. - This inconspicuous sibling to the phloxes is very rare in Missouri, possibly no longer occurring in the state at all. The plant is only known in Missouri from a single historical collection, in Marion County in 1918. It can be easily recognized by its tubular phlox-like flowers, alternate leaves, and generally diminutive appearance.

Photographs taken along the Little Muddy Creek, southwest of Bear Mountain, CO, 6-26-2018 (SRTurner).