Flora of North America species comparison

with slender branches from bases, hairy, developing fissured barks.

erect, usually branched from bases, often throughout (scapiform in E. nutans and E. scaposa).

cauline;

petioles 6–12 mm;

blades silvery green, ovate to deltate, 25–40 mm, apices acute, faces ± silvery-canescent.

usually cauline, sometimes basal (E. nutans and E. scaposa); alternate (usually drought-deciduous); petiolate (obscurely in E. scaposa);

blades (1- or 3-nerved) mostly deltate, lanceolate, rhombic, or ovate (narrowly oblanceolate to linear in E. scaposa), bases broadly to narrowly cuneate, margins usually entire, rarely toothed, face glabrous or canescent, hirtellous, scabrellous, strigose, or tomentose, often gland-dotted as well.

canescent.

8–14 mm.

± hemispheric or broader, 4–22 mm diam.

flat or convex, paleate (paleae ± conduplicate, folded around and falling with cypselae).

14–25;

corolla laminae 10–25 mm.

0 or 8–25(–40), neuter;

corollas yellow.

yellow, 5–6 mm.

80–100(–200+), bisexual, fertile;

corollas yellow or brown-purple, tubes shorter than to equaling abruptly expanded throats, lobes 5, triangular.

ovate.

persistent, 18–30(–50+) in 2–3+ series (subequal to unequal, outer shorter).

borne singly.

radiate or discoid, borne singly or in ± paniculiform arrays (peduncles usually longer than involucres).

5–7 mm;

pappi usually 0, rarely of 1–2 bristlelike awns.

strongly compressed, obovate to cuneate (margins ciliate, apices usually ± notched except in E. scaposa, faces usually glabrous except in E. scaposa);

pappi usually 0, sometimes readily falling or persistent, of 2 bristlelike awns.

= 18.

= 36.