Flora of North America species comparison

ascending to erect, glabrous proximally, glandular-hairy distally.

cauline, opposite;

petiole present or absent;

blade not fleshy, not leathery, margins entire, crenate, dentate, or serrate.

terminal, racemes;

bracts present.

present, glandular-hairy, sometimes glabrous or glabrate;

bracteoles absent.

bisexual;

sepals 5, proximally connate, calyx ± bilaterally symmetric, subrotate to campanulate, lobes triangular to lanceolate;

corolla white on tube and lobes proximally, blue to violet or lavender on lobes distally, with dark violet spots internally near bases of adaxial and lateral lobes, bilaterally symmetric, weakly bilabiate, subrotate, tube base gibbous adaxially, sometimes obscurely so, not spurred abaxially, throat not densely pilose internally, lobes 5, abaxial 3, middle lobe of abaxial lip not folded lengthwise, not enclosing stamens and style, adaxial 2;

stamens 4, medially adnate to corolla, equal or ± didynamous, exserted, filaments glandular;

staminode 1, minute;

ovary 2-locular, placentation axile;

stigma linear.

capsules, dehiscence septicidal and loculicidal.

2 or 4, dark brown to black, reniform to ovoid, wings absent.