UW Burke Herbarium species comparison

Leaves opposite, ovate-lanceolate to elliptic-oblanceolate, 5-12 cm. long and up to 4 cm. broad, the lower ones long-petiolate, the upper sub-sessile.

Leaves opposite, numerous, the basal slender-petiolate, the blades oblanceolate, up to 15 cm. long and 3 cm. wide;

cauline leaves 2-8 pairs, reduced gradually upward, becoming sessile above.

Flowers few to several in an open inflorescence, the pedicels 3-30 mm. long;

calyx 5u00e2u20acu201clobed, tubular, 15 mm. long at flowering, much enlarged in fruit, 10-nerved, the lobes lance-linear, 5-9 mm. long;

petals 5, white to pinkish, glabrous, the claw 12-25 mm. long, auriculate above, the blade 7-10 mm. long, bi-lobed less than half the length;

blade appendages 2, 0.5-1.5 mm. long and broad;

stamens 10;

styles 3. Flowers open at dusk.

Flowers numerous, the inflorescence narrow and elongate, consisting of a series of small, congested, lateral cymes;

calyx broadly tubular, 5-lobed, 10-18 mm. long;

corolla greenish-white to purplish, the claw of the petal 7-16 mm. long, the blade flaring, 4-8 mm. long, from bi-lobed to nearly equally 4-lobed, with 2 appendages at the base, 1-3 mm. long;

ovary with a stalk 3-6 mm. long, puberulent to woolly;

stamens 10;

styles 3.

Capsule 3-celled.

Capsule 1-celled.