UW Burke Herbarium species comparison

Leaves linear to linear-oblong, 2-11 cm. long and 1-10 mm. wide.

Leaves linear or lance-linear, 2-7 cm. long and 1-5 mm. wide.

Heads in a raceme, or multiple racemes in plants with branched stems;

involucre ovoid, 6-11 mm. high and 5-10 mm. wide, its bracts in a single series and of equal length;

rays 5-13, typically 8, 4-7 mm. long, pistillate and fertile, yellow, their achenes enclosed by the involucral bracts;

disk flowers fertile, yellow, separated from the ray flowers by a row of bracts;

pappus none.

Heads tightly packed together in a few to many small clusters;

involucre spindle-shaped, 6-9 mm. high and 2-4 mm. wide;

rays inconspicuous, 2 mm. long, usually 1-3 or wanting;

disk flowers several, fertile, yellow, their subtending bracts like those of the ray flowers, which are in a single series and of equal length;

pappus none.

Achenes flattened.