Flora of North America species comparison

erect, ascending, or decumbent, unbranched or branched.

often several from caudex (sterile shoots absent or few), usually erect or ascending, (2.5–)3–6(–7) 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 narrowly oblanceolate to linear, (0.5–)0.7–2.5(–3) cm × 1–5(–8) mm (gradually smaller distally), base cuneate to attenuate, apex obtuse to subacute, (surfaces often more grayish abaxially than adaxially). (Racemes corymbose, in panicles terminating each stem.) Fruiting pedicels divaricate-ascending, straight or slightly curved distally, slender, (2–)2.5–6(–8) 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, 1.2–2 × 0.4–0.7 mm, stellate-pubescent;

petals yellow, spatulate, 2.5–3.5 × 0.5–1 mm, base attenuate, apex often obtuse or rounded, glabrous abaxially;

filaments: median pairs broadly winged, apically 1-toothed, lateral pair with lanceolate or narrowly oblong basal appendage, apically subacute, 1.5–2.5 mm;

anthers oblong, 0.2–0.3 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 to orbicular, 3.5–5 × 2.5–5 mm, apex obtuse to rounded;

valves not inflated, flattened and slightly undulate, stellate-pubescent;

ovules 1 per ovary;

style (slender) 1–2 mm, sparsely pubescent.

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.

suborbicular to broadly ovoid, compressed, 3–3.8 × 2–3.2 mm, margins winged, wing 0.5–0.9 mm wide.

= 16, 32.