Taxon	Illustrator ⠉
	Rudbeckia laciniata var. laciniata Rudbeckia maxima Guardiola platyphylla Rudbeckia amplexicaulis	John Myers John Myers Marjorie C. Leggitt John Myers

Perennials or subshrubs, (10–) 30–100 cm. Stems mostly erect, branched. Leaves cauline; opposite; ± petiolate; blades deltate or rounded-deltate to ovate [lanceolate to linear], margins usually dentate, faces glabrous or glabrate. Heads radiate, in corymbiform arrays [borne singly]. Involucres narrowly cylindric [campanulate], 2–3 [–6] mm diam. Phyllaries persistent, 3–5 in 1 series (distinct, oblong or lanceolate to linear, herbaceous, conduplicate, streaked with 8–12+ translucent nerves, margins often membranous). Receptacles convex, paleate (paleae similar to phyllaries, membranous, each enfolding a floret). Ray-florets 1–5, pistillate, fertile; corollas whitish (tubes often longer than laminae). Disc-florets 3–20+, functionally staminate; corollas whitish, tubes longer than abruptly ampliate, campanulate to funnelform throats, lobes 5, lanceolate to lance-linear (filaments hairy; anthers green). Cypselae ± ellipsoid [fusiform to clavate], ± obcompressed, smooth or fine-ribbed, glabrous (bases carunculate); pappi 0 [5–6, erose scales]. x = 12.

Distribution

sw United States, Mexico

Discussion

Species ca. 10 (1 in the flora).

Selected References

None.

Lower Taxa

Guardiola platyphylla