Packera layneae

(Greene) W. A. Weber & Á. Löve

Phytologia 49: 47. 1981.

Common names: Layne’s ragwort
EndemicConservation concern
Basionym: Senecio layneae Greene Bull. Torrey Bot. Club 10: 87. 1883
Synonyms: Senecio fastigiatus var. layneae (Greene) A. Gray
Treatment appears in FNA Volume 20. Treatment on page 590. Mentioned on page 577, 591.

Perennials, 40–70+ cm; taprooted (caudices erect to suberect, branched, stout). Stems 1 or 3–4+, clustered, sparsely tomentose to glabrescent. Basal leaves (and proximal cauline, relatively thick and turgid) petiolate; blades narrowly elliptic or lanceolate to oblanceolate, 40–70+ × 5–20+ mm, bases tapering, margins entire or subentire to weakly and irregularly dentate (especially at apices). Cauline leaves gradually reduced (distal sessile, bractlike). Heads 5–12+ in open, cymiform arrays. Peduncles bracteate (bractlets usually red-tipped), sparsely tomentose to glabrate. Calyculi conspicuous (bractlets red-tipped). Phyllaries 13 or 21, dark green proximally, becoming light green distally (tips red), 7–11+ mm, floccose-tomentose proximally. Ray-florets 5 or 8; corolla laminae 12–16 mm. Disc-florets 50–60+; corolla-tubes 3.5–4.5 mm, limbs 4.5–5.5 mm. Cypselae 2.5–3.5 mm, glabrous; pappi 7–8 mm. 2n = 92.


Phenology: Flowering early May–early Jul.
Habitat: Openings, disturbed areas, in chaparral, serpentine soils
Elevation: 300–900 m

Discussion

Of conservation concern.

Packera layneae is known only from the foothills of the western slope of the Sierra Nevada.

Selected References

None.

Lower Taxa

None.
... more about "Packera layneae"
not tailed +, rounded +  and obtuse +
papillate +
truncate-penicillate +
scarious +
usually ovate +  and lance-linear +
cymiform +  and open +
indeterminate +  and determinate +
Debra K. Trock +
(Greene) W. A. Weber & Á. Löve +
tapering +
Senecio layneae +
4 cm40 mm <br />0.04 m <br /> (7 cm70 mm <br />0.07 m <br />) +
lanceolate;oblanceolate +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
winged;nerved;ribbed +
Layne’s ragwort +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
pale-yellow +  and deep orange-red +
1.2 cm12 mm <br />0.012 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
cylindric +
fertile +  and bisexual +
fertile +  and bisexual +
300–900 m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Openings, disturbed areas, in chaparral, serpentine soils +
discoid +  and radiate +
in compact or congested to open corymbiform cymiform or subumbelliform , , , arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
campanulate;cylindric +
sessile +  and petiolate +
cauline +  and basal +
erect;recurved +
deltate +
subentire +  and entire +
2-carpellate +
0.7 cm7 mm <br />0.007 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
sparsely tomentose +  and glabrate +
Flowering early May–early Jul. +
light green +  and dark green +
floccose-tomentose +
linear +  and ensiform +
0.7 cm7 mm <br />0.007 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
bearing subulate enations +, hairy +  and bristly +
conic;usually flat;convex +
exalbuminous +
Endemic +  and Conservation concern +
prostrate +  and ascending +
sparsely tomentose +  and glabrescent +
3 +  and 4 +
appendaged +  and truncate +
papillate +
Senecio fastigiatus var. layneae +
Packera layneae +
species +
campanulate +
serrate +  and denticulate +
40 cm400 mm <br />0.4 m <br /> (70 cm700 mm <br />0.7 m <br />) +
vine +, tree +, shrub +  and subshrub +
23 +, 22 +  and 20 +