Flora of North America species comparison

1, branching at various levels in larger plants.

erect or decumbent.

basal often withered at flowering time, cauline spreading;

basal blades spatulate-obovate to oblanceolate or elliptic-oblong, 3–15 × 1–3 mm;

cauline blades narrowly elliptic-oblong to oblanceolate, 3.5–7 × 0.5–2 mm, base connate-sheathing 0.5 mm, apex obtuse to subacute.

cauline, opposite, sometimes also basal.

1–5-flowered;

pedicels 3–60 mm.

solitary flowers or 2–5-flowered, irregular or ± dichasial cymes.

calyx hemispheric, 2–7 mm, much exceeding corolla tube in diam., outer lobes proximally rhombic, distal portion triangular, apex acute, inner lobes proximally oblong, distal portion with strongly invaginated flanges, abruptly narrowed into ovate-triangular, cucullate, acuminate apex;

corolla 3–10 mm, lobes ovate-triangular to ovate-elliptic, 1–4 mm, apex rounded or abruptly acute.

4-merous;

calyx tubular, lobes longer than tube, connate, 2 outer lobes wider than inner [not connate, all equal];

corolla yellow, salverform, glabrous, lobes shorter, abruptly spreading at summit of tube, margins entire, plicae between lobes absent;

stamens inserted in corolla sinuses;

anthers distinct, remaining straight;

style deciduous, erect, distinct, cleft 1 mm or less [not cleft];

ovary short-stipitate;

stigmas 2;

nectaries absent.

widely ellipsoid.

 = 13.

 = 26.