Flora of North America species comparison

erect, branched distally or ± throughout.

green.

cauline; mostly opposite (distal sometimes alternate);

petiolate or sessile;

blades mostly lanceolate to oblanceolate overall, usually 1–3-pinnately lobed or -pinnatisect, ultimate margins toothed or entire, faces glabrous or hairy (oil-glands scattered and/or submarginal).

green, not glaucous;

basal (usually withering before flowering) usually petiolate, blades linear, lanceolate to ovate, or elliptic to oblanceolate, sometimes lobed, bases attenuate, cuneate, or rounded, margins entire, dentate, or serrate, apices acute to obtuse, faces glabrous or hairy, sometimes gland-dotted;

cauline usually petiolate (at least proximal), distal usually sessile, blades linear or ovate to pandurate, sometimes lobed, lobes 3(–5), bases auriculate, attenuate, or cordate, margins entire or serrate, apices acute to obtuse, faces glabrous or hairy, sometimes gland-dotted.

narrowly cylindric or fusiform to turbinate or broadly campanulate, 1–12+ mm diam.

convex to conic, smooth or finely pitted, epaleate.

usually conic to hemispheric, rarely columnar;

paleae surpassing cypselae, margins sometimes ciliate, apices obtuse or rounded to acute or attenuate to apiculate, faces glabrous or hairy abaxially.

0 or 1–8(–13+) (to 100+ in “double” cultivars), pistillate, fertile (except “double” cultivars);

corollas yellow or orange, red-brown (with or without yellow/orange), or white.

6–25+;

corollas usually yellow-orange proximally, yellow distally, sometimes with basal maroon splotch (orangish red to maroon in R. graminifolia).

6–120+, bisexual, fertile;

corollas greenish yellow to orange, sometimes tipped with red or red-brown, tubes much longer than or about equaling funnelform throats, lobes 5, deltate to lance-linear (equal or 2 sinuses deeper than others).

50–800+;

corollas proximally yellow to yellowish green, distally usually brown-purple, lobes sometimes yellowish or greenish;

anther appendages sometimes gland-dotted;

styles 3–5+ mm, branches 1–1.8 mm, proximal 1/2–4/5 stigmatic, apices acute to rounded.

persistent, 3–21+ in 1–2 series (connate to 7/8+ their lengths, usually streaked and/or dotted with oil-glands).

in 2(–3) series.

0.

radiate or discoid, borne singly or in ± corymbiform arrays.

borne singly or in loose, corymbiform to paniculiform arrays.

narrowly obpyramidal or fusiform-terete, sometimes weakly flattened, glabrous or hairy;

pappi persistent, of 2–5(–10) dissimilar, distinct or connate scales in ± 1 series: 0–5+ oblong to lanceolate, erose-truncate or laciniate plus 0–2(–5) longer, subulate to aristate.

1.5–3.5(–4) mm;

pappi usually coroniform (sometimes cypselae each with glandular hairs around apices in R. heliopsidis).

8–30 × 5–25 mm.

= 12.

= 19.