Perityle megalocephala
Perityle sect. Laphamia
bighead rockdaisy, large head rock daisy, limestone rockdaisy, Nevada 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.
10–45(–80) mm.
campanulate.
funnelform, campanulate, or hemispheric, 5–11 × 3.5–14 mm.
0.
0, or 3–5, or 6–18;
corollas yellow.
45–60;
corollas yellow, tubes 1–1.6 mm, throats tubular to subfunnelform, 1.6–2.2 mm, lobes 0.4–0.7 mm.
9–200;
corollas yellow or white.
14–20, lanceolate to suboblanceolate, 5–6 × 1.3–1.9 mm.
borne singly or (2–3) in loose, corymbiform arrays, 6–9(–10) × 5–6(–8) mm.
narrowly oblanceolate to suboblanceolate, 2.5–3 mm, margins thin-calloused, short-hairy;
pappi 0, or of single bristles.
linear, linear-lanceolate, oblanceolate or oblong to oblanceolate, flattened, often obscurely rounded or angled on 1 or both surfaces, margins usually inconspicuously calloused and sparsely short-hairy;
pappi 0 or of 1–2(–6) equal or subequal, smooth, antrorsely barbellulate, or subplumose bristles 0.5–4.6 mm plus callous crowns or hyaline scales.
= 17.
Perityle megalocephala
Perityle sect. Laphamia
CA; NV
United States; Mexico
Varieties 2 (2 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Species 29 (22 in the flora).
(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 |
1. Corollas white; rays 0; plants 2–12 cm; Texas (Big Bend area) | → 2 |
1. Corollas yellow; rays 0, or 3–5, or 6–18; plants (4–)12–75 cm; Arizona, California, Nevada, New Mexico, Texas, or Utah | → 3 |
2. Pappi 0 or callous crowns (bristles 0); plants densely scabrous-pubescent | P. warnockii |
2. Pappi usually of 2–3(–5) bristles; plants glabrate, minutely hairy, or scabrous-hispidulous | P. bisetosa |
3. Rays 3–5 or 6–18 | → 4 |
3. Rays usually 0 (sometimes 1–2, reduced, in P. ambrosiifolia) | → 9 |
4. Leaf blades broadly ovate, ovate-deltate, ovate-lanceolate, or ovate-rhombic; disc florets 11–22; Texas | → 5 |
4. Leaf blades ± cruciform, subdeltate, or subovate, usually 3-partite or lobed, divided, or pinnate; disc florets 30–200; Arizona, Nevada, New Mexico, Utah | → 6 |
5. Disc florets 11–13; Hueco Mountains | P. huecoensis |
5. Disc florets 16–22; Edwards Plateau | P. lindheimeri |
6. Leaf blades usually ± cruciform, sometimes lobed or pinnate; New Mexico | P. staurophylla |
6. Leaf blades subdeltate, suborbiculate, or subovate, or deeply lobed, 3-foliolate, or 2–3-pinnate; Arizona, Nevada, Utah | → 7 |
7. Disc florets 60–80; leaf blades subdeltate, suborbiculate, or subovate, margins serrate or ± lobed; Nevada, Utah | P. stansburyi |
7. Disc florets 75–200; leaf blades 3-foliolate, or 2–3-pinnate; Arizona | → 8 |
8. Leaf blades 2–3-pinnate (lobes linear to flat-filiform, scarcely broad- ened distally) | P. saxicola |
8. Leaf blades usually 3-foliolate (lobes much broadened distally) | P. gilensis |
9. Plants long-hairy, pilose, or villous | → 10 |
9. Plants glabrous, or hirtellous, hispidulous, or puberulent, or short-hairy, or short-tomentose | → 15 |
10. Leaf blades deeply dissected (lobes relatively numerous, irregular) | → 11 |
10. Leaf blades entire, serrate, or shallow-lobed | → 13 |
11. Phyllaries 4–6.4(–8) mm (apices acute); disc corolla throats broadly tubu-lar to subfunnelform; pappus bristles delicate | P. lemmonii |
11. Phyllaries 6–9 or (5–)7–13 mm (apices usually attenuate, sometimes acute); disc corolla throats narrowly tubular to narrowly funnelform; pappus bristles moderately stout | → 12 |
12. Leaf blades 15–30 mm wide; phyllaries 14–20; Arizona | P. ambrosiifolia |
12. Leaf blades 4–15 mm wide; phyllaries 12–15; Texas | P. dissecta |
13. Leaf margins entire or with 1–3 lobes per side (leaves all alternate) | P. villosa |
13. Leaf margins serrate (leaves opposite or alternate) | → 14 |
14. Pappi usually callous crowns (bristles 0); California | P. inyoensis |
14. Pappus usually of single, delicate bristles 1–3 mm; Arizona, New Mexico | P. lemmonii |
15. Plants densely short-hairy or short-tomentose | → 16 |
15. Plants glabrous, or hirtellous, hispidulous, or puberulent | → 17 |
16. Leaf margins serrate; plants densely short-hairy; nw Arizona, Nevada, Utah | P. tenella |
16. Leaf margins usually shallow-crenate; plants densely short-tomentose; sw Arizona | P. ajoensis |
17. Leaf blades 2–8(–15) mm (stems sparsely leafy) | → 18 |
17. Leaf blades 3–30 mm (stems moderately to densely leafy) | → 20 |
18. Pappus bristles usually 1–3(–4), rarely 0; se Utah | P. specuicola |
18. Pappus bristles usually 0, sometimes 1–2; California, s Nevada | → 19 |
19. Heads borne singly or (2–3) in loose, corymbiform arrays; peduncles 10–45(–80) mm; leaf blades usually elliptic, lanceolate, lance-ovate, ovate, or suborbiculate (sometimes linear in var. oligophylla) | P. megalocephala |
19. Heads (2–6) in tight, corymbiform arrays; peduncles 1–10 mm; leaf blades linear | P. intricata |
20. Pappi usually 0, sometimes 1–2 bristles; plants glabrate or puberulent; Texas | P. angustifolia |
20. Pappi usually of 1–3(–6) bristles, sometimes 0; plants glabrous, hirtellous, or short-hairy; Arizona, Nevada | → 21 |
21. Leaf blades usually deeply divided (lobes 3, relatively broad to linear, usually secondarily lobed, cleft, or parted, often ± cruciform, sometimes almost entire); sc Arizona | P. staurophylla |
21. Leaf blades entire, toothed, or lobed; Arizona, Nevada | → 22 |
22. Plants 4–12(–15+) cm; petioles 5–30 mm (equal to or longer than blades; leaves usually glabrous); se Arizona | P. cochisensis |
22. Plants 10–30(–45) cm (petioles shorter than blades; leaves hairy); nw Arizona, se Nevada | → 23 |
23. Leaf blades usually 3-lobed to ± cruciform; nw Arizona, se Nevada | P. gracilis |
23. Leaf blades elliptic, lanceolate, or ovate, usually entire or 2–6-toothed; nw Arizona | P. congesta |
CA
WildflowerSearch
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USDA Plants Database
