Verbesina rothrockii
Verbesina
Rothrock's crownbeard
crownbeard
usually erect, usually branched (internodes sometimes winged).
all or mostly opposite (distal sometimes alternate);
blades ovate-deltate or rhombic to lance-elliptic, 3–5 × 1–3 cm, bases subtruncate to cuneate, margins coarsely toothed to subentire, apices obtuse to acute, faces ± hirtellous to scabrellous.
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.
± hemispheric, 10–15+ mm diam.
hemispheric, turbinate, or campanulate to saucerlike, 5–20+[–30+] mm diam.
flat to convex or ± conic, paleate (paleae usually navicular, ± conduplicate, herbaceous to scarious, linear to filiform in V. encelioides and V. nana).
8–13;
laminae 15–25+ mm.
0 or (1–)5–30, either pistillate and fertile, or styliferous and sterile, or neuter;
corollas yellow to orange or ochroleucous [reddish].
60–100+;
corollas yellow.
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.
18–30+ in 3–4 series, ± erect, oblong to elliptic, 6–10+ mm.
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).
borne singly.
radiate or discoid, borne singly or in corymbiform, dichasiiform, or paniculiform arrays.
dark brown, ± elliptic, 10 mm, faces glabrous;
pappi 0–0.5 mm.
± flattened, orbiculate, obovate, or oblanceolate to ± elliptic (usually winged);
pappi persistent [falling], usually of 2, ± subulate scales or awns, sometimes 0.
= 17, 18?
= 34.
Verbesina rothrockii
Verbesina
Species 200 or more (16 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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 | V. walteri |
3. Ray florets (1–)2–12+ | → 4 |
4. Ray florets (1–)2–3(–7); disc florets 8–12(–15) | V. virginica |
4. Ray florets (9–)10–12+; disc florets 20–25+ | V. microptera |
5. Plants 10–50(–120+)cm (annuals); internodes not winged; disc florets 80–150+ | V. 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+ | V. alternifolia |
6. Heads 2–5(–10+) in ± corymbiform arrays; phyllaries 16–21+ in 2–3 series,± erect; ray florets 8–13+ | V. 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 | V. occidentalis |
8. Phyllaries 18–20+ in 2–3 series; ray florets (5–)8; disc florets 20–60+; pappi 0–0.3mm | V. heterophylla |
9. Plants mostly 7–15+ cm; leaves: abaxial faces mostly strigoso-sericeous; cypselae± strigillose | V. 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 | V. aristata |
11. Phyllaries 5–9+ mm; ray florets 0; cypselae 5–7 mm; pappi 0–0.3 mm | V. chapmanii |
12. Leaf blades ± lance-linear (lengths 10–15 times widths) | V. 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 | V. dissita |
13. Pappi 0–0.5 mm | → 14 |
14. Phyllaries 12–16 in ± 2 series, lance-linear, lance-ovate, or linear, 4–7 mm | V. 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 | V. rothrockii |
15. Involucres 15–22+ mm diam.; phyllaries oblong, orbiculate, or ovate; cypselae 7 mm | V. lindheimeri |
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