UW Burke Herbarium species comparison

Principal leaves opposite, short-petiolate, the blade broadly elliptic to nearly orbicular, cordate based, with short, broad teeth, 1-2 cm. long and three-fourths or more as wide.

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 single on long pedicels (up to 6 cm. in fruit) along an elongate stem, each subtended by a leaf-like, alternate bract, which are reduced upward;

sepals 4, prominent, often veiny;

corolla bluish-lavender, 5-11 mm. wide, rotate, 4-lobed; the upper lobe the largest;

style 1.5-2.5 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 5-9 mm. wide and 3-5 mm. high.

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