UW Burke Herbarium species comparison

Leaves opposite, sharply toothed or entire, the basal ones 10-35 cm. long and 2.5-9 cm. wide, petiolate, the blade lanceolate to elliptic; lowermost cauline leaves reduced, the others well-developed, sessile and often clasping, broadly lanceolate to rotund-ovate, 4-12 cm. long and 2-5 cm. wide.

Leaves opposite, glabrous, the largest on short, sterile shoots, serrulate or nearly entire, short-petiolate, the blades elliptic, 1.5-3.5 cm. long and 6-14 mm. wide;

leaves of the flowering shoots less crowded, smaller, sessile and entire.

Inflorescence of several verticillasters;

calyx 9-15 mm. long, the 5 segments narrow and herbaceous;

corolla blue-lavender, strongly glandular-hairy outside, glabrous inside, 28-40 mm. long, over 1 cm. wide at the mouth;

anthers permanently horseshoe-shaped, 1.7-2.3 mm. long;

pollen sacs dehiscent across their apices, the lower part saccate and indehiscent, glabrous;

staminode glabrous, the tip flattened.

Inflorescence racemose, few-flowered and crowded, glandular, the simple pedicels opposite and axillary;

calyx 5-12 mm. long, the 5 segments thin and lanceolate;

corolla bright purple to deep blue-violet, 30-38 mm. long, about 1 cm. wide at the mouth, keeled on the back, glabrous outside and with long, white hairs near the base of the lower lip within;

anthers long-wooly, pollen sacs opposite;

staminode slender, shorter than the 4 fertile filaments, long-bearded toward the tip

Capsules 10-14 mm. long, surpassed by the calyx.

Capsule