Flora of North America species comparison

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

decumbent to ascending, simple or few- to much-branched, 20–60 cm, sparsely to moderately glandular-puberulent.

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 lanceolate-ovate or oblong, 8–25 × (1–)3–8(–13) mm, margins with (1 or)2–4 pairs of sharp teeth distally, apex acute, surfaces sparsely to densely glandular-puberulent.

axillary, flowers 1 or 2 per node;

bracts present.

present, sometimes short;

bracteoles present or absent, sepal-like.

slender, (5–)10–25(–30) mm, length 0.8–1.8 times bract, densely glandular-puberulent to glandular-pubescent;

bracteoles (1 or)2, 4–4.5 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, 5–7 mm;

corolla 10–13 mm, tube yellowish brown, veins yellow or brownish yellow, limb white;

style 3–5 mm.

capsules, dehiscence septicidal, sometimes also loculicidal.

subglobular to ovoid, 1.5–2.5 × 1–1.3 mm.

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

0.3–0.4 mm.

= 28.