Perityle ambrosiifolia

Greene ex A. M. Powell & Yarborough

Phytologia 76: 325, fig. 1. 1994.

Common names: Lace-leaved rock daisy
Treatment appears in FNA Volume 21. Treatment on page 331. Mentioned on page 324.

Perennials or subshrubs, 10–30 cm (stems brittle, densely leafy); usually villous, often with glandular-hairs, sometimes pilose. Leaves: petioles 5–10 mm; blades 3-partite or compound-pinnatifid, 15–35 × 15–30 mm, lobes lobed, cleft, parted, or divided, ultimate margins crenate. Heads in corymbiform arrays, 7–10 × 6–11 mm. Peduncles 3–10 mm. Involucres campanulate. Phyllaries 14–20, linear to linear-lanceolate, 6–9 × 0.5–1.2 (–2) mm (apices usually short-attenuate, sometimes acute). Ray-florets usually 0 (sometimes 1–2 reduced rays in isolated heads, laminae color unknown, 3–5 × 1.5–2 mm). Disc-florets 25–45; corollas yellow, tubes 1–1.2 mm, throats tubular to narrowly funnelform, 2–2.5 mm, lobes 0.6–0.8 mm. Cypselae 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. 2n = ca. 17.


Phenology: Flowering spring–fall.
Habitat: Rock crevices, cliff faces, and canyons
Elevation: 1000–1500 m

Discussion

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.

Selected References

None.

Lower Taxa

None.
... more about "Perityle ambrosiifolia"
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 +
Greene ex A. M. Powell & Yarborough +
decurrent +
Undefined sect. Laphamia +
compound +  and simple +
1.5 cm15 mm <br />0.015 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
compound-pinnatifid;3-partite +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
subplumose +, barbellulate +  and smooth +
subequal +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
Lace-leaved rock daisy +
oblanceolate +
fertile +  and bisexual +
fertile +  and bisexual +
1000–1500 m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Rock crevices, cliff faces, and canyons +
discoid +  and radiate +
in corymbiform arrays +  and singly +
indeterminate +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
homogamous +  and heterogamous +
0.6 cm6 mm <br />0.006 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
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 />) +
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 +
divided +, parted +, cleft +  and lobed +
dentate to pinnatifid or palmatifid +  and entire +
short-hairy +
thin-calloused +
2-carpellate +
persistent +
of 1-2(-6) equal or subequal , smooth , antrorsely barbellulate or subplumose , bristles +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering spring–fall. +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
14 +  and 20 +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
laciniate +
exalbuminous +
erect +  and pendent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Amauriinae +
Perityle ambrosiifolia +
Perityle sect. Laphamia +
species +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
45 cm450 mm <br />0.45 m <br /> (75 cm750 mm <br />0.75 m <br />) +