Heterotheca shevockii

(Semple) Semple

Rev. Heterotheca Phyllotheca, 148. 1996.

Common names: Shevock’s goldenaster
EndemicConservation concern
Basionym: Heterotheca villosa var. shevockii Semple Phytologia 73: 453. 1993
Treatment appears in FNA Volume 20. Treatment on page 254. Mentioned on page 231, 234, 255.

Perennials, (28–) 50–131 cm; taprooted. Stems 1–35+, ascending to erect (sometimes brown proximally, sometimes ± brittle), sparsely strigose, moderately hispid (hairs often broken off in older stems), distally sparsely hispido-strigose and densely stipitate-glandular, abundantly long-hirsute. Leaves: proximal cauline subpetiolate to sessile, blades oblanceolate to lanceolate, 25–55 × 5–16 mm, bases convex-cuneate, margins entire, strigoso-ciliate, proximally long-ciliate, apices acute, mucronate, faces moderately hispido-strigose; distal blades sessile, linear-lanceolate to lanceolate-triangular, (17–) 31–65 × 6–15 mm, reduced distally, bases abruptly convex-cuneate or rounded to sometimes subclasping, margins entire, usually revolute, faces sparsely to moderately long-hispido-strigose proximally, moderately to densely stipitate-glandular (branch leaves much reduced distally, linear to linear-oblanceolate). Heads (3–) 5–20 (–70) in paniculiform arrays, branches elongate on robust shoots. Peduncles 10–60+ mm, sparsely hispido-strigose, densely stipitate-glandular; bracts 3–10, proximal leaflike, greatly reduced distally, linear to linear-oblanceolate, distalmost phyllary-like (not surpassing heads). Involucres cylindro-turbinate to campanulate, 9–13 mm. Phyllaries in 5–6 series, unequal (outer lengths 1/5–1/4 inner), faces sparsely strigose especially along pronounced midnerves, densely stipitate-glandular. Ray-florets 9–15 (–18); laminae 5–8 (–10) × 0.8–2 mm. Disc-florets (31–) 40–70 (–80); corollas barely ampliate, 5–7 mm, tubes and throats sparsely strigose, lobes 0.3–0.8 (–1.1) mm, lobes glabrous or sparsely strigose (hairs 0.04–0.27 mm). Cypselae monomorphic, obconic, compressed, 2–4.5 mm, ribs 8–12, faces moderately strigose; pappi off-white, outer of linear scales 0.25–1 mm, inner of 35–45 bristles 5–7 mm, longest weakly clavate (usually equaling or shorther than corollas). 2n = 36.


Phenology: Flowering (Jan–)Aug–Sep(–Nov).
Habitat: Sandy, gravelly soils and rock crevices along river in grass and open xeric pine and oak woods
Elevation: 400–900 m

Discussion

Of conservation concern.

Known only from the lower Kern River Canyon, Kern County, Heterotheca shevockii is distinguished from other species by its usually tall stems and lanceolate-triangular mid cauline leaves with usually revolute margins, its large heads and floral parts, and pappi bristles usually only about 90% the length of the disc corollas at flowering. Smaller plants are similar to H. villosa var. scabra, known in California from a few locations in the Little San Bernardino Mountains (1200–1300 m).

Selected References

None.

Lower Taxa

None.

"[" is not declared as a valid unit of measurement for this property."]" is not declared as a valid unit of measurement for this property.

... more about "Heterotheca shevockii"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +
indeterminate +  and determinate +
John C. Semple +
(Semple) Semple +
subclasping +
rounded +  and convex-cuneate +
Heterotheca villosa var. shevockii +
compound +  and simple +
2.5 cm25 mm <br />0.025 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
oblanceolate;lanceolate +
5mm;16mm +
rugulose +  and muricate +
elongate +
barbellulate +  and barbellate +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
rhizomatous +  and taprooted +
Shevock’s goldenaster +
not 2-lipped +  and actinomorphic +
ampliate +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
compressed +  and obconic +
fertile +  and bisexual +
1.7 cm17 mm <br />0.017 m <br /> (3.1 cm31 mm <br />0.031 m <br />) +
3.1 cm31 mm <br />0.031 m <br /> (6.5 cm65 mm <br />0.065 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
400–900 m +
strigose +, stipitate-glandular +, long-hispido-strigose +  and hispido-strigose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sandy, gravelly soils and rock crevices along river in grass and open xeric pine and oak woods +
paniculiform +
in corymbiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
tan;rusty brown +
attenuate +  and clavate +
cylindro-turbinate;campanulate +
0.9 cm9 mm <br />0.009 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.8mm;2mm +
sessile +  and petiolate +
cauline +  and basal +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
erect;spreading +
strigose +  and glabrous +
lanceolate +, triangular +  and deltate +
long-ciliate +  and strigoso-ciliate +
stipitate-glandular +  and strigose +
2-carpellate +
in 3 +  and 4 series +
stipitate-glandular +  and hispido-strigose +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
Flowering (Jan–)Aug–Sep(–Nov). +
lanceolate +  and linear-lanceolate +
ovate-oblanceolate +
linear +  and linear-oblanceolate +
subpetiolate +  and sessile +
Rev. Heterotheca Phyllotheca, +
bearing subulate enations +, hairy +  and bristly +
subulate;convex +
8 +  and 12 +
3 +  and 40 +
linear +  and linear-lanceolate or triangular +
0.025 cm0.25 mm <br />2.5e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
exalbuminous +
Endemic +  and Conservation concern +
ascending +  and erect +
1 +  and 35 +
appendaged +  and truncate +
papillate +  and smooth +
Ammodia +, Chrysopsis subg. Ammodia +  and Heterotheca sect. Ammodia +
Heterotheca shevockii +
Heterotheca +
species +
28 cm280 mm <br />0.28 m <br /> (50 cm500 mm <br />0.5 m <br />) +
50 cm500 mm <br />0.5 m <br /> (131 cm1,310 mm <br />1.31 m <br />) +
tree +, shrub +  and subshrub +