Flora of North America species comparison

erect, trailing, or climbing, diffusely branched, to 3+ m, glabrous or pubescent on youngest shoots.

erect, prostrate, or climbing, ribbed.

usually sessile, sometimes short-petiolate;

blade elliptic, oblanceolate, or spatulate, (1–)2.5–9 × 0.5–2.5 cm, base usually long-attenuate, sometimes auriculate, apex acute or obtuse, mucronate.

cauline, sessile or short-petiolate (petiole usually less than 1.5 cm);

blade elliptic to oblanceolate or spatulate, base narrowed, margins entire, apex acute, acuminate, or obtuse, membranaceous.

2.5–3(–5) cm, rachises short-pilose (hairs ca. 0.1 mm), eglandular;

floral bracts lanceolate, 3–9 × 1–2 mm.

terminal or axillary spikelike racemes or panicles.

2-bracteolate, short.

3-stylous;

calyx 10–13 mm, tube usually short-pilose and with stalked, capitate, glandlike protuberances ca. 1 mm along distal 1/2–3/4 of ribs;

corolla pale blue, 37–53 mm, tube 28–40 mm (more than 2 times length of calyx), lobes 10–16 × 6–15 mm;

stamens included or exserted.

sometimes heterostylous, short-pedicellate;

bracts absent;

calyx persistent, 5-ribbed, tubular, with stalked, capitate-glandular protuberances along ribs;

lobes triangular, 1–2 mm;

corolla salverform, evenly to somewhat unevenly 5-lobed, lobes spreading, obovate, round, or truncate, mucronate;

stamens included or exserted, free from corolla;

style 1 included or exserted;

stigmas 5, linear.

capsules, included, brownish, long-beaked;

valves coherent at apex.

8 mm.

brown, 7 mm.

= 7.

= 14 + 0–1B.