Flora of North America species comparison

stiffly ascending-spreading, few to many-branched.

erect-ascending, unbranched or branched from base, unbranched proximal to inflorescence, conspicuously ribbed distally.

alternate, appressed;

stipular glands present at basal nodes or throughout;

blade linear, 7–20 × 0.5–l.9 mm, margins entire, not ciliate, apex aristate.

proximal 5–20 pairs opposite, distal opposite or alternate, erect to spreading;

stipular glands absent;

blade elliptic to oblanceolate or obovate, 15–35 × 4–10 mm, margins entire, not ciliate, apex obtuse or acute.

racemes.

elongate panicles.

3–15 mm.

0–4 mm.

sepals deciduous, lanceolate to narrowly ovate, 4–7 mm, margins scarious, delicately glandular-toothed, apex aristate;

petals yellow to yellow-orange throughout, oblanceolate to narrowly obovate, 5–10 mm;

stamens (3–)4–7 mm;

anthers 0.4–1 mm;

staminodia present or absent;

styles connate nearly to apex, 2–5.7 mm;

stigmas green, capitate.

sepals persistent, lanceolate to ovate, 1.5–3.5 mm, margins not scarious, eglandular or inner with a few delicate small marginal glands, apex acute or apiculate;

petals pale yellow, obovate, 2.7–4.6 mm;

stamens 1.5–2 mm;

anthers 0.3–0.7 mm;

staminodia absent;

styles distinct, 1.2–2 mm;

stigmas capitate.

ovoid, 3.2–4.5 × 2.5–3.4 mm, relatively thick-walled and with characteristic thickened areas at apex in region of true septa, apex obtuse, dehiscing into 5, 2-seeded segments, segments persistent on plant, false septa complete, proximal part membranaceous, not terminating in loose fringe, distal part cartilaginous, margins ciliate.

globose, carpels convex abaxially, 1.3–1.9 × 1.8–2.3 mm, apex depressed, dehiscing freely into 10, 1-seeded segments, segments falling freely, false septa nearly complete, proximal margins not ciliate.

2–3 × 0.8–1.3 mm.

1–1.4 × 0.5–0.7 mm.

= 36.