Flora of North America species comparison

mostly erect, branched from bases and/or throughout.

cauline; opposite;

petiolate or sessile;

blades (3-nerved [pinnately nerved]) trullate to lanceolate or lance-linear [deltate, elliptic, filiform, linear, ovate], sometimes ± 3-lobed, bases cuneate to truncate, margins coarsely toothed to subentire, faces hispid [scabrous to scabrellous or strigose to strigillose, ± sericeous, often with finer, uncinate hairs as well], usually gland-dotted.

obconic to hemispheric, 4–8[–15] mm diam.

convex, paleate (paleae conduplicate, chartaceous to scarious).

0 or 4–18, pistillate, fertile [neuter];

corollas yellow to orange [purplish or white].

8–150+, bisexual, fertile;

corollas yellow to orange [purplish], sometimes marked with purple, tubes shorter than or equaling funnelform or cylindric throats, lobes 5, deltate.

persistent, 8–16+ in 2–3+ series (outer usually larger and/or more herbaceous than inner).

radiate (discoid), borne singly [in corymbiform arrays].

± dimorphic;

peripheral sometimes obcompressed and weakly 3-angled, inner compressed and biconvex or flattened [somewhat 4-angled] (some or all winged, all ± rostrate, bearing central neck or boss apically, some or all each bearing wartlike elaiosome at base);

pappi persistent, cyathiform (fimbriate cups plus 0–3 coarse bristles or awns borne together on rostra).

= 13?