UW Burke Herbarium species comparison

Basal and lower cauline leaves spatulate to obovate, opposite, 8-15 mm. long and up to 8 mm. broad, tapered to the petiole; middle and upper cauline leaves larger, ovate to obovate, sessile.

Leaves opposite, the basal and lower cauline spatulate to oblanceolate, 7-25 mm. long, broadly short-petiolate;

cauline leaves several pairs, linear-lanceolate to ovate, sessile.

Flowers numerous, in tight clusters in an open inflorescence;

pedicels shorter than the calyx;

sepals 5, 4-5 mm. long, stiff-hairy;

petals 5, white, equal to the sepals;

stamens 10;

styles 5.

Flowers several in a loose, leafy, bracteate cyme; pedicles slender, 5-20 mm. long, spreading to ascending by sharply deflexed near the tip;

sepals 5, 3-5 mm. long;

petals white, from slightly shorter to half again as long as the sepals, sometimes lacking;

styles 5, distinct to the base, opposite the sepals;

stamens 10.

Capsule cylindric, twice as long as the calyx.

Capsule cylindric, 2-3 times as long as the calyx.