Flora of North America species comparison

erect, ascending, or decumbent, unbranched or branched.

often several from base, usually erect or ascending, rarely decumbent, (unbranched or branched distally), (0.3–)0.7–3(–4) dm.

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 petiolelike base (to 0.4 cm);

blade oblanceolate, obovate-spatulate, or elliptic-lanceolate, (0.5–)0.7–2.2(–3) cm × (1–)2–6(–8) mm (gradually smaller distally), base attenuate, apex acute.

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

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).

sepals oblong, 1.7–2.3 × 0.8–1.1 mm, trichomes stellate;

petals pale yellow, oblanceolate, (1.8–)2–2.8(–3.2) × 0.6–0.8 mm, base attenuate, apex often emarginate, sparsely stellate-pubescent abaxially or glabrous;

filaments: median pairs broadly winged, apically 1- or 2-toothed, lateral pair with broadly winged appendage, apically 2-cleft, 1.4–2 mm;

anthers ovate, 0.3–0.4 mm.

ascending, divaricate, or reflexed, slender or stout.

divaricate, straight, stout, (2–)3–5(–6) mm, trichomes stellate (some with unequal rays).

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.

orbicular, (3.5–)4–6.5(–7) mm diam., apex truncate or shallowly emarginate;

valves uniformly inflated at middle, broadly flattened at margins, densely stellate-pubescent (trichomes coarse, rays equal or unequal);

ovules 2 per ovary;

style 0.7–1.6 mm, basally stellate-pubescent or glabrous.

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.

ovoid, 1.6–2 × 1.2–1.5 mm, slightly compressed, margined or not.

= 16.