Perennials or subshrubs (in rock crevices). Involucres funnelform, campanulate, or hemispheric, 5–11 × 3.5–14 mm. Ray-florets 0, or 3–5, or 6–18; corollas yellow. Disc-florets 9–200; corollas yellow or white. Cypselae 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. x = 17.

Distribution

United States, Mexico

Discussion

Species 29 (22 in the flora).

Key

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 Perityle warnockii
2 Pappi usually of 2–3(–5) bristles; plants glabrate, minutely hairy, or scabrous-hispidulous Perityle 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 Perityle huecoensis
5 Disc florets 16–22; Edwards Plateau Perityle lindheimeri
6 Leaf blades usually ± cruciform, sometimes lobed or pinnate; New Mexico Perityle 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 Perityle 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) Perityle saxicola
8 Leaf blades usually 3-foliolate (lobes much broadened distally) Perityle 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 Perityle 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 Perityle ambrosiifolia
12 Leaf blades 4–15 mm wide; phyllaries 12–15; Texas Perityle dissecta
13 Leaf margins entire or with 1–3 lobes per side (leaves all alternate) Perityle villosa
13 Leaf margins serrate (leaves opposite or alternate) > 14
14 Pappi usually callous crowns (bristles 0); California Perityle inyoensis
14 Pappus usually of single, delicate bristles 1–3 mm; Arizona, New Mexico Perityle 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 Perityle tenella
16 Leaf margins usually shallow-crenate; plants densely short-tomentose; sw Arizona Perityle 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 Perityle 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) Perityle megalocephala
19 Heads (2–6) in tight, corymbiform arrays; peduncles 1–10 mm; leaf blades linear Perityle intricata
20 Pappi usually 0, sometimes 1–2 bristles; plants glabrate or puberulent; Texas Perityle 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 Perityle 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 Perityle 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 Perityle gracilis
23 Leaf blades elliptic, lanceolate, or ovate, usually entire or 2–6-toothed; nw Arizona Perityle congesta
... more about "Perityle sect. Laphamia"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Sharon C. Yarborough +  and A. Michael Powell +
(A. Gray) A. M. Powell +
decurrent +
Undefined sect. Laphamia +
compound +  and simple +
3-lobed +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
subplumose +, barbellulate +  and smooth +
subequal +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.46 cm4.6 mm <br />0.0046 m <br />) +
white +  and yellow +
angled +, rounded +, flattened +, oblong +  and oblanceolate +
fertile +  and bisexual +
fertile +  and bisexual +
United States +  and Mexico +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
discoid +  and radiate +
in corymbiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
hemispheric;campanulate;hemispheric;campanulate +
0.35 cm3.5 mm <br />0.0035 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
sessile +  and petiolate +
alternate +  and opposite +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
short-hairy +
calloused +
2-carpellate +
persistent +
of 1-2(-6) equal or subequal , smooth , antrorsely barbellulate or subplumose , bristles +
5 +  and 28 +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
powell1973a +
exalbuminous +
erect +  and pendent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Amauriinae +
Perityle sect. Laphamia +
Perityle +
section +
campanulate +  and cylindric +
lobed +, toothed +  and entire +
45 cm450 mm <br />0.45 m <br /> (75 cm750 mm <br />0.75 m <br />) +