Flora of North America species comparison

simple or few to several from base, erect, ascending, or decumbent, (0.2–)0.5–1.8(–2.8) dm.

erect, ascending, or decumbent, unbranched or branched.

basal and cauline; petiolate or sessile;

basal rosulate or not, petiolate or sessile, blade margins entire;

cauline petiolate or sessile, blade (base cuneate or attenuate), margins entire.

subsessile or (proximal) attenuate to petiole-like base (to 0.5 cm);

blade linear to oblanceolate-linear, (0.3–)0.5–2.5(–3) cm × (0.5–)1–3(–4) mm (gradually smaller distally), base attenuate, apex acute.

(few- to several-flowered, sometimes corymbose or paniculate).

sepals oblong, 1.4–1.8(–2) × 0.4–0.5 mm, stellate-pubescent;

petals pale yellow, oblanceolate, 2–2.5 × 0.5–0.6 mm, base attenuate, apex obtuse or retuse, sparsely stellate-pubescent abaxially;

filaments: median pairs not toothed, gradually expanded from apex to narrowly winged base, lateral pair with broadly winged appendage apically notched into 2 teeth, 1–1.8(–2) mm;

anthers ovate, 0.1–0.2 mm.

sepals ovate or oblong, lateral pair not saccate;

petals yellow or white [rarely pink], suborbicular, spatulate, oblanceolate, linear-oblanceolate, or, obovate (apex obtuse or emarginate);

stamens tetradynamous;

filaments not winged, uni- or bilaterally winged, appendaged, or toothed;

anthers ovate or oblong;

nectar glands (4), 1 on each side of lateral stamen, median glands absent; (placentation apical or parietal).

ascending or subdivaricate, straight, stout, (1–)1.5–3.5(–4.5) mm, trichomes uniformly stellate.

ascending, divaricate, or reflexed, slender or stout.

orbicular, 2.5–4(–4.5) mm diam., apex shallowly emarginate, usually glabrous;

valves uniformly inflated at middle, broadly flattened at margins, often glaucous, rarely sparsely pubescent (when young);

ovules 2 per ovary;

style 0.3–0.7 mm, glabrous.

sessile, ovate-oblong, obovate, or elliptic [obcordate, rarely globose], usually strongly flattened, latiseptate, rarely inflated;

valves each not veined (smooth), pubescent or glabrous;

replum (visible), rounded;

septum complete, (membranous, translucent, veinless);

ovules 1 or 2 [or 4–8] per ovary;

stigma capitate.

ovoid, slightly compressed, 1.2–1.5 × 0.9–1.1 mm, margined or not.

biseriate or aseriate, flattened, winged or not, orbicular or suborbicular to ovoid;

seed coat (smooth or minutely reticulate), mucilaginous or not when wetted;

cotyledons accumbent or incumbent.

= 32.