UW Burke Herbarium species comparison

Leaves opposite, elliptic to broadly ovate, 1-2.5 cm. long and 0.5-1 cm. wide, glabrous, entire or slightly toothed, the lower often short-petiolate, the others sessile.

Leaves opposite, elliptic or elliptic-ovate, narrowed to a short petiole, 1.5-5 cm. long and 0.6-3 cm. wide, finely serrate

Flowers on short pedicels in a loose, elongate, terminal raceme, the upper subtending bracts alternate;

sepals 4;

corolla bright blue to white, 4-8 mm. wide, rotate, 4-lobed, the upper lobe the largest;

style 2-3.5 mm. long;

stamens 2.

Inflorescence of spike-like racemes on long peduncles arising from the leaf axils;

pedicels 1-2 mm. long, surpassed by the small, alternate, subtending bracts;

calyx of 4 sepals;

corolla light blue, sometimes with lavender stripes, 4-8 mm. wide, rotate, 4-lobed;

style 2.5-4.5 mm. long;

stamens 2.

Capsule 3-4 mm. high, broader than high, notched, finely glandular-pubescent,

Capsule 4 mm. high, broadly triangular-cordate, nearly truncate.