Perityle coronopifolia
Perityle ambrosiifolia
Arizona rockdaisy, crow-foot rock daisy
lace-leaf rock daisy
petioles 2–8(–12) mm;
blades pedately 3-lobed (lobes spatulate or linear), or 2–3-pinnatifid (lobes linear-filiform), 4–30 × 4–20 mm, ultimate margins entire.
petioles 5–10 mm;
blades 3-partite or compound-pinnatifid, 15–35 × 15–30 mm, lobes lobed, cleft, parted, or divided, ultimate margins crenate.
7–15 mm.
3–10 mm.
campanulate.
campanulate.
8–12;
corollas white, laminae broadly oblong or oblong-elliptic to subspatulate, 3–7 × 2–3 mm.
usually 0 (sometimes 1–2 reduced rays in isolated heads, laminae color unknown, 3–5 × 1.5–2 mm).
30–40;
corollas yellow, often purple tinged, tubes 0.8–1 mm, throats tubular, tubular-funnelform, or tubular-campanulate, 1–1.3 mm, lobes 0.3–0.4 mm.
25–45;
corollas yellow, tubes 1–1.2 mm, throats tubular to narrowly funnelform, 2–2.5 mm, lobes 0.6–0.8 mm.
2–16, linear-lanceolate to narrow-ovate, 3.5–5 × 0.5–1.5 mm.
14–20, linear to linear-lanceolate, 6–9 × 0.5–1.2(–2) mm (apices usually short-attenuate, sometimes acute).
(2–5) in corymbiform arrays, 5–6.5 × 5–6 mm.
in corymbiform arrays, 7–10 × 6–11 mm.
linear-oblong to narrowly oblanceolate, 1.8–2.5 mm, margins usually prominently calloused, sometimes thin, usually ciliate;
pappi of 2(–3+) barbellulate bristles 1.5–2.5 mm plus crowns of hyaline, laciniate scales.
narrowly oblanceolate, 3–4 mm, margins thin-calloused, short-hairy;
pappi usually 0, sometimes of 1–3 moderately stout bristles 2.8–4.5 mm, often plus hyaline, laciniate scales.
= 34.
= ca. 17.
Perityle coronopifolia
Perityle ambrosiifolia
Perityle coronopifolia is widespread in south-central and southeastern Arizona, and southwestern and south-central New Mexico. The combination of white rays, often pinnatifid leaves, and perennial habit distinguish it.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Of conservation concern.
Perityle ambrosiifolia occurs in the vicinity of Clifton and Morenci in Greenlee County. Most heads are discoid; 1 or 2 ray florets sometimes appear on isolated heads; color of the laminae is not known; only dried specimens without the ray color noted have been examined. The species was first recognized by E. L. Greene in 1900; no record exists that the species as proposed by him was formally published. Perityle ambrosiifolia is morphologically and geographically distinct from P. lemmonii and may have resulted from either intrasectional or intersectional hybridization between two of several possible taxa.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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