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.

Basal leaves opposite, clustered, petiolate, with ovate to sub-cordate blade up to 10 cm. long and half as wide, about equaling the petiole, serrate, hairy like the stem, especially along the mid-vein beneath;

cauline leaves sessile and clasping, more sharply serrate, nearly as large, but more broadly oblong, the upper ovate.

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 large and open, strongly glandular-hairy;

calyx 3-5 mm. long, broadly lanceolate, with parallel veins;

corolla blue, 15-22 mm. long, glandular-hairy on the outside, the raised portion of the lower petal pale blue and hairy;

corolla strongly bilabiate, the lower lip much the longer;

pollen sacs 0.8-1.1 mm. long, fully dehiscent and becoming opposite, nearly glabrous;

staminode bearded toward the recurved tip.

Capsule 9-12 mm. long.

Capsule 4-6 mm. long.