UW Burke Herbarium species comparison

Leaves opposite, entire, the basal ones clustered, up to 27 cm. long and 4 cm. wide, petiolate, the blade lanceolate or narrowly elliptic;

cauline leaves mostly sessile, broad and clasping.

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 5-cleft nearly to the base, 6-9 mm. long, the segments narrow and acuminate;

corolla bilabiate, bright blue, 25-33 mm. long, about 1 cm. wide at the mouth, glabrous;

pollen sacs 1.9-2.5 mm. long, divaricate, twisted, dentate along the sutures, the inner end indehiscent;

fertile stamens 4;

sterile stamen short-bearded toward the tip.

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

Capsule 9-12 mm. long.

Capsule