Flora of North America species comparison

slender, unbranched or branched, 10–20 cm.

often intricately branched, 5–80 cm.

primarily cauline;

petiole 0.3–1.8 cm;

blade unlobed, narrowly ovate to elliptic, 0.3–2 × 0.3–1 cm, margins entire or inconspicuously denticulate, brownish oil cells lining veins abaxially.

in poorly defined basal rosette and also cauline;

petiole 0.3–3.8 cm;

blade usually unlobed, very rarely pinnately lobed with few, small lateral lobes, ovate to elliptic, margins sparsely denticulate to subentire, pale or dark brown oil cells lining veins abaxially.

erect, elongating in fruit.

nodding, with intricate, filiform branches, elongating in fruit.

opening at sunrise;

buds without free tips;

floral tube 0.4–0.5 mm, glabrous inside;

sepals 1–1.2 mm;

petals yellow, fading pale lavender, 1–1.5 mm;

stamens 4 (or 8), antisepalous, filaments 0.5 mm, anthers 0.5–0.7 mm, glabrous, when 8, then antipetalous ones smaller and abortive;

style 1.5 mm, stigma surrounded by anthers at anthesis.

opening at sunrise;

buds without free tips;

floral tube 0.5–2 mm, glabrous or villous inside;

sepals 1.5–4 mm;

petals bright yellow, often with red dots near base, fading pale yellow or yellowish orange, 2–7 mm;

stamens unequal, filaments of antisepalous stamens 1.7–3.5 mm, those of antipetalous ones 1.2–2.5 mm, anthers 0.9–1.2 mm, glabrous;

style 4–9 mm, stigma exserted beyond anthers at anthesis.

spreading or reflexed, clavate, 4–10 mm;

pedicel 3–9 mm.

erect or ascending, clavate, 4–10 mm;

pedicel 4–20 mm.

0.8 mm.

0.7–1.2 mm.

= 14.

= 14.