Flora of North America species comparison

decumbent to ascending or erect, glabrous or glandular-hairy.

ascending to erect, simple or few-branched, 4–50 cm, glabrous or glabrate proximally, glabrous or glandular-puberulent distally.

cauline (also basal and clustered in G. amphiantha), opposite, monomorphic (dimorphic in G. amphiantha);

petiole absent;

blade not fleshy, not leathery, margins entire or toothed, surfaces often glandular-punctate.

blade lanceolate to elliptic or oblong-obovate, 15–70 × 5–25 mm, margins entire or with 1–4 pairs of blunt or sharp teeth distally, apex obtuse to acute, surfaces glabrous.

axillary, flowers 1 or 2 per node;

bracts present.

present, sometimes short;

bracteoles present or absent, sepal-like.

stout, 1–12 mm, length 0.1–0.3 times bract, glabrous or sparsely glandular-puberulent;

bracteoles 2, 2–6 mm.

bisexual;

sepals 5, distinct or proximally connate, calyx ± bilaterally symmetric, campanulate, lobes (sepals when distinct) linear to lanceolate, obovate, or oblong;

corolla white, cream, or yellow, sometimes pinkish, tube yellowish, brownish, or purplish, often with dark veins, bilaterally symmetric, bilabiate, tubular, tube base not spurred or gibbous, lobes 5, abaxial 3, adaxial 2, nearly completely connate and appearing as 1 emarginate lobe, throat glabrous or pubescent;

stamens 2, medially adnate to corolla, filaments glabrous, pollen sacs perpendicular to filaments, connective dilated;

staminodes 0 or 2, minute;

ovary 2-locular, placentation axile;

stigma capitate or lamelliform.

sepals distinct, linear-lanceolate to lanceolate or oblong, 4–7 mm;

corolla 8–15 mm, tube greenish white to greenish yellow or yellow, veins purple or brownish purple, limb white, sometimes tinged lavender;

style 2–4 mm.

capsules, dehiscence septicidal, sometimes also loculicidal.

subglobular, (3–)4–9 × 4–8 mm.

ca. 200, yellow to brown or black, oblong to obpyramidal or short-cylindric, wings absent.

0.7–0.8 mm.

= 16.