Perityle megalocephala
Perityle congesta
bighead rockdaisy, large head rock daisy, limestone rockdaisy, Nevada Rock daisy
Grand Canyon rockdaisy, Kaibab or Grand Canyon Rock daisy
petioles 1–6 mm;
blades usually elliptic, lanceolate, lance-ovate, ovate, or suborbiculate, sometimes linear, 4–8(–15) × 1–10(–12) mm, margins entire, irregularly and sparsely serrate, or serrate-lobed.
petioles 2.5–10(–15) mm (shorter than blades);
blades elliptic, lanceolate, or ovate, 5–17(–20) × 4–8(–10) mm, (bases cuneate) margins usually entire or with 2(–6) teeth.
10–45(–80) mm.
3–17 mm.
campanulate.
campanulate.
0.
0.
45–60;
corollas yellow, tubes 1–1.6 mm, throats tubular to subfunnelform, 1.6–2.2 mm, lobes 0.4–0.7 mm.
30–40;
corollas yellow, tubes 0.8–1 mm, throats tubular to subfunnelform, 1.2–1.5 mm, lobes 0.3–0.5 mm.
14–20, lanceolate to suboblanceolate, 5–6 × 1.3–1.9 mm.
12–16, narrowly lanceolate, oblong-lanceolate, or lanceolate, 3.2–4.5 × 0.8–1.4 mm.
borne singly or (2–3) in loose, corymbiform arrays, 6–9(–10) × 5–6(–8) mm.
borne singly or (2–8) in corymbiform arrays, 5–6(–6.5) × 3.5–4.5(–5) mm.
narrowly oblanceolate to suboblanceolate, 2.5–3 mm, margins thin-calloused, short-hairy;
pappi 0, or of single bristles.
narrowly oblanceolate, (2–)2.5–3 mm,margins thin-calloused, short-hairy;
pappi of 1–2 subequal or unequal bristles 2–2.7 mm.
= 32.
Perityle megalocephala
Perityle congesta
Varieties 2 (2 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Of conservation concern.
The leaf blades of Perityle congesta usually have a tooth on each margin, cuneate bases, and unobtrusive veins abaxially; those of P. tenella usually have serrate margins, truncate bases, and raised veins abaxially. Perityle congesta is found on both rims and extending into the Grand Canyon and northward almost to the Utah border. Available specimens suggest that P. congesta and P. tenella intergrade where their ranges overlap in northwestern Arizona on the Colorado Plateau. Specimens from the Colorado Plateau have intermediate leaf shapes and induments.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Leaf blades ovate, lanceolate-ovate or elliptic to suborbiculate | var. megalocephala |
1. Leaf blades linear to lanceolate | var. oligophylla |
CA
WildflowerSearch
iNaturalist
USDA Plants Database
