Perityle dissecta

(Torrey) A. Gray in A. Gray et al.

in A. Gray et al., Syn. Fl. N. Amer. 1(2): 320. 1884.

Common names: Slim-lobe or dissected rock daisy
Conservation concern
Basionym: Laphamia dissecta Torrey Smithsonian Contr. Knowl. 5(6): 81. 1853
Treatment appears in FNA Volume 21. Treatment on page 331. Mentioned on page 324, 332.

Perennials or subshrubs, 7–20 cm (densely leafy); pilose. Leaves: petioles (3–) 4–10 mm; blades lanceolate to deltate, 4–15 × 4–15 mm, usually 1–3-pinnately divided, lobes irregular, rounded, ultimate margins laciniate. Heads borne singly or in corymbiform arrays, 8–10 × 4–5 mm. Peduncles 2–8 (–17) mm. Involucres campanulate. Phyllaries 12–15, linear to linear-lanceolate, (5–) 7–13 × 0.5–0.9 mm (apices usually attenuate, sometimes acute). Ray-florets 0. Disc-florets 20–30; corollas yellow, tubes 1–1.5 mm, throats usually narrowly tubular, (2–) 2.5–2.8 mm, lobes 0.7–1 mm. Cypselae oblong to narrowly oblanceolate, (2.8–) 3–3.8 mm, margins moderately calloused, short-hairy; pappi 0, or of 1 (–4) moderately stout bristles (1–) 2.2–3 mm. 2n = 34, 68.


Phenology: Flowering spring–fall.
Habitat: Limestone walls of canyons
Elevation: 800–1200 m

Discussion

Of conservation concern.

Perityle dissecta occurs in southern Brewster and Presidio counties. It and P. lemmonii have been considered conspecific by some taxonomists because of similarities in gross leaf morphology. The differences in phyllaries, disc corollas, and pappus bristles, as well as distinct distributions, support recognizing them as separate species.

Selected References

None.

Lower Taxa

None.
... more about "Perityle dissecta"
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 +
(Torrey) A. Gray in A. Gray et al. +
decurrent +
Laphamia dissecta +
compound +  and simple +
0.4 cm4 mm <br />0.004 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
divided;lanceolate;deltate +
4mm;15mm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
subplumose +, barbellulate +  and smooth +
0.1 cm1 mm <br />0.001 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
subequal +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Slim-lobe or dissected rock daisy +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
oblong +  and narrowly oblanceolate +
fertile +  and bisexual +
fertile +  and bisexual +
Tex. +  and Mexico (Chihuahua) +
800–1200 m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Limestone walls of canyons +
discoid +  and radiate +
in corymbiform arrays +  and singly +
indeterminate +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
homogamous +  and heterogamous +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 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 +
rounded +
dentate to pinnatifid or palmatifid +  and entire +
short-hairy +
2-carpellate +
persistent +
of 1-2(-6) equal or subequal , smooth , antrorsely barbellulate or subplumose , bristles +
0.8 cm8 mm <br />0.008 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering spring–fall. +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
12 +  and 15 +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
in A. Gray et al., Syn. Fl. N. Amer. +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
exalbuminous +
Conservation concern +
erect +  and pendent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Amauriinae +
Perityle dissecta +
Perityle sect. Laphamia +
species +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
7 cm70 mm <br />0.07 m <br /> (20 cm200 mm <br />0.2 m <br />) +