Verbesina

Annuals or perennials [shrubs, trees], 7–15+ cm (Verbesina nana) or 30–200(–400)[–2500+] cm. Stems usually erect, usually branched (internodes sometimes winged). Leaves basal and/or cauline; opposite (sometimes whorled) or alternate; petiolate or sessile; blades (pinnately nerved or 3- or 5-nerved from at or near bases) mostly rhombic, deltate, ovate, or elliptic to lanceolate or lance-linear (sometimes intermediate shapes), sometimes pinnately or palmately lobed, bases cuneate to rounded or cordate, ultimate margins subentire or toothed, faces glabrous or hairy. Heads radiate or discoid, borne singly or in corymbiform, dichasiiform, or paniculiform arrays. Involucres hemispheric, turbinate, or campanulate to saucerlike, 5–20+[–30+] mm diam. Phyllaries persistent, 9–30[–50+] in 1–4[–5+] series (orbiculate, ovate, or oblong to spatulate, lanceolate, or linear, subequal or unequal, outer shorter or longer than inner, herbaceous to chartaceous). Receptacles flat to convex or ± conic, paleate (paleae usually navicular, ± conduplicate, herbaceous to scarious, linear to filiform in V. encelioides and V. nana). Ray florets 0 or (1–)5–30, either pistillate and fertile, or styliferous and sterile, or neuter; corollas yellow to orange or ochroleucous [reddish]. Disc florets 8–150[–300+], bisexual, fertile; corollas usually concolorous with rays, tubes much shorter than or ± equaling funnelform or campanulate throats, lobes 5, ± deltate to lance-deltate. Cypselae ± flattened, orbiculate, obovate, or oblanceolate to ± elliptic (usually winged); pappi persistent [falling], usually of 2, ± subulate scales or awns, sometimes 0. x = 17, 18?

Distribution

Mostly subtropical, tropical, and warm-temperate North America.

Discussion

Species 200 or more (16 in the flora).

Selected References

Coleman, J. R. 1966. A taxonomic revision of section Ximenesia of the genus Verbesina (Compositae). Amer. Midl. Naturalist 76: 475–481.

Coleman, J. R. 1966b. A taxonomic revision of section Sonoricola of the genus Verbesina (Compositae). Madroño 18: 129–137.

Olsen, J. S. 1979. Taxonomy of the Verbesina virginica complex (Asteraceae). Sida 8: 128–134.

Lower Taxa

Verbesina alternifolia, Verbesina aristata, Verbesina chapmanii, Verbesina dissita, Verbesina encelioides, Verbesina helianthoides, Verbesina heterophylla, Verbesina lindheimeri, Verbesina longifolia, Verbesina microptera, Verbesina nana, Verbesina occidentalis, Verbesina oreophila, Verbesina rothrockii, Verbesina virginica, Verbesina walteri

Key

1	Leaves all or mostly alternate (proximalmost sometimes opposite)	> 2
1	Leaves all or mostly opposite (distal sometimes alternate)	> 7
2	Corollas usually ochroleucous, sometimes white	> 3
2	Corollas yellow	> 5
3	Ray florets 0	Verbesina walteri
3	Ray florets (1–)2–12+	> 4
4	Ray florets (1–)2–3(–7); disc florets 8–12(–15)	Verbesina virginica
4	Ray florets (9–)10–12+; disc florets 20–25+	Verbesina microptera
5	Plants 10–50(–120+)cm (annuals); internodes not winged; disc florets 80–150+	Verbesina encelioides
5	Plants 7–15 or 30–200+ cm (perennating bases ± erect or horizontal); internodes (at least proximal) winged; disc florets 40–80+	> 6
6	Heads (3–)8–25(–50+) in corymbiform to paniculiform arrays; phyllaries 8–12in 1(–2) series, ± spreading to reflexed; ray florets (2–)6–8+	Verbesina alternifolia
6	Heads 2–5(–10+) in ± corymbiform arrays; phyllaries 16–21+ in 2–3 series,± erect; ray florets 8–13+	Verbesina helianthoides
7	Internodes winged	> 8
7	Internodes not winged	> 9
8	Phyllaries 8–12+ in 2 series; ray florets (0–)1–3(–5); disc florets 8–15+; pappi 3–4 mm	Verbesina occidentalis
8	Phyllaries 18–20+ in 2–3 series; ray florets (5–)8; disc florets 20–60+; pappi 0–0.3mm	Verbesina heterophylla
9	Plants mostly 7–15+ cm; leaves: abaxial faces mostly strigoso-sericeous; cypselae± strigillose	Verbesina nana
9	Plants mostly 30–100(–150+) cm; leaves: faces (at least abaxial) scabrellous to hirtellous, hirsutulous, or hispidulous (not strigoso-sericeous); cypselae glabrous or sparsely hirtellous	> 10
10	Perennating bases horizontal; disc florets 40–60(–80+); cypselae purplish black; Florida	> 11
10	Perennating bases ± erect; disc florets 60–120+; cypselae dark brown; Arizona, California, New Mexico, Texas	> 12
11	Phyllaries 2–3+ mm; ray florets (5–)11–13; cypselae 4–5 mm; pappi 0.5–1mm	Verbesina aristata
11	Phyllaries 5–9+ mm; ray florets 0; cypselae 5–7 mm; pappi 0–0.3 mm	Verbesina chapmanii
12	Leaf blades ± lance-linear (lengths 10–15 times widths)	Verbesina longifolia
12	Leaf blades lance-elliptic, lance-ovate, ovate, ovate-deltate, or rhombic (lengths mostly 1.5–2.5 times widths)	> 13
13	Pappi 3–4 mm	Verbesina dissita
13	Pappi 0–0.5 mm	> 14
14	Phyllaries 12–16 in ± 2 series, lance-linear, lance-ovate, or linear, 4–7 mm	Verbesina oreophila
14	Phyllaries 18–30+ in 3–4 series, elliptic, oblong, orbiculate, or ovate, 5–12+ mm	> 15
15	Involucres 10–15+ mm diam.; phyllaries elliptic to oblong; cypselae 10 mm	Verbesina rothrockii
15	Involucres 15–22+ mm diam.; phyllaries oblong, orbiculate, or ovate; cypselae 7 mm	Verbesina lindheimeri