Flora of North America species comparison

erect, ascending, or decumbent, unbranched or branched.

often several from base (often with sterile shoots), usually erect or ascending, 0.7–1.5(–2) 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;

blade broadly oblanceolate, obovate-spatulate, or obovate, 0.6–1.4(–1.7) cm × (1–)2–6 mm (gradually smaller distally), base attenuate, apex rounded, obtuse, or subacute. (Racemes corymbose, simple, or in panicles terminating each stem.) Fruiting pedicels divaricate, straight, slender, (2–)3–7(–9) mm, trichomes uniformly stellate.

(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, 1.5–2 × 0.7–1 mm, stellate-pubescent;

petals yellow, broadly spatulate, 2.5–3.5(–4) × 1–1.5 mm, base attenuate, apex often obtuse or rounded, glabrous abaxially;

filaments: median pairs unilaterally broadly winged, apically 1-toothed, lateral pair with lanceolate or narrowly oblong basal appendage, apically obtuse or subacute, 1.5–2 mm;

anthers oblong, 0.3–0.4 mm.

ascending, divaricate, or reflexed, slender or stout.

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.

broadly elliptic or obovate, 3–4.5(–5) × 2.5–3.5 mm, apex obtuse to rounded;

valves inflated at middle or on 1 side, flattened at margins, densely stellate-pubescent;

ovules (1 or) 2 per ovary;

style (slender), 1.5–2 mm, 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, compressed, 1–1.7 × 0.8–1.2 mm, not winged or margined.

= 16, 32.