Heterotheca grandiflora

Nuttall

Trans. Amer. Philos. Soc., n. s. 7: 315. 1840.

Common names: Silk-grass goldenaster
Endemic
Synonyms: Heterotheca floribunda Bentham
Treatment appears in FNA Volume 20. Treatment on page 235. Mentioned on page 231, 232, 236.

Annuals, biennials, or short-lived perennials, 10–250 cm (atypical, spring-blooming, dwarf dune plants have short stems; perennating from proximal stem nodes in south; aromatic); taprooted. Stems 1–5+, ascending to erect (strict, 0.9–1.7 cm diam., only distal lateral branches developing in larger plants), moderately to densely hispido-strigose, more so proximally, moderately to densely stipitate-glandular, more so distally. Leaves: basal and proximal cauline petiolate (petioles 3–7 cm, bases auriculate-clasping), blades ovate or elliptic to oblong, 50–80 × 20–30 mm, margins flat or somewhat undulate, coarsely serrate to serrulate or entire, proximally long-ciliate, apices acute, faces moderately to densely long-hispido-strigose; distal sessile, blades oblong-lanceolate to lanceolate, 20–40 × 20–30 mm, reduced distally, margins often undulate, coarsely serrate. Heads 10–110+, in corymbiform arrays, becoming paniculiform with age, branches ascending, usually relatively short compared to plant height. Peduncles 10–65 mm, sparsely to densely hispido-strigose, densely stipitate-glandular; bracts 0–3, linear-lanceolate to linear, reduced distally. Involucres campanulo-hemispheric, 6–9 mm. Phyllaries in 4–6 series, linear-lanceolate, unequal, margins scarious, faces strigose, densely stipitate-glandular. Ray-florets 20–40; laminae 5–8 × 1–2 mm. Disc-florets 30–75; corollas 4–6 mm, lobes 0.5–0.8 mm. Cypselae dimorphic, (ray) 2–5 mm, faces glabrous or slightly strigose on angles, (disc) 4–6 mm, faces moderately to densely strigose; pappi 0 (ray) or (disc) stramineous to rusty brown, outer bristles 0.4–0.7 mm, inner 6–9 mm, longest weakly clavate. 2n = 18.


Phenology: Flowering Apr–Dec(–Jan).
Habitat: Sandy and gravelly soils, dunes, disturbed ground, roadsides, vacant lots, fields
Elevation: 0–100(–900) m

Distribution

V20-517-distribution-map.gif

Ariz., Calif., Nev., Utah, in Pacific Islands (Hawaii)

Discussion

Heterotheca grandiflora is common in California, rare and probably introduced in Arizona, Nevada, and Utah, and introduced in Hawaii. Rosette plants can bloom in the spring.

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 grandiflora"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
John C. Semple +
Nuttall +
decurrent +
compound +  and simple +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
oblong-lanceolate;lanceolate +
reduced +
20mm;30mm +
rugulose +  and muricate +
linear-lanceolate +  and linear +
reduced +
barbellulate +  and barbellate +
rhizomatous +  and taprooted +
Silk-grass goldenaster +
not 2-lipped +  and actinomorphic +
ampliate +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
3-angled +, not +, compressed +  and obconic +
fertile +  and bisexual +
Ariz. +, Calif. +, Nev. +, Utah +  and in Pacific Islands (Hawaii) +
0–100(–900) m +
strigose +, glabrous +, stipitate-glandular +  and long-hispido-strigose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sandy and gravelly soils, dunes, disturbed ground, roadsides, vacant lots, fields +
paniculiform +
in corymbiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
tan;rusty brown +
attenuate +  and clavate +
campanulo-hemispheric +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
cauline +, proximal +  and basal +
erect;spreading +
lanceolate +, triangular +  and deltate +
serrate +, entire +, coarsely serrate +  and serrulate +
stipitate-glandular +  and strigose +
undulate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
2-carpellate +
stramineous to rusty brown +
stipitate-glandular +  and hispido-strigose +
1 cm10 mm <br />0.01 m <br /> (6.5 cm65 mm <br />0.065 m <br />) +
Flowering Apr–Dec(–Jan). +
linear-lanceolate +
ovate-oblanceolate +
Trans. Amer. Philos. Soc., n. s. +
bearing subulate enations +, hairy +  and bristly +
subulate;convex +
3 +  and 40 +
linear +  and linear-lanceolate or triangular +
exalbuminous +
ascending +  and erect +
1 +  and 5 +
appendaged +  and truncate +
papillate +  and smooth +
Heterotheca floribunda +
Heterotheca grandiflora +
Heterotheca +
species +
60 cm600 mm <br />0.6 m <br /> (200 cm2,000 mm <br />2 m <br />) +
perennial +, short-lived +, biennial +  and annual +
10 cm100 mm <br />0.1 m <br /> (250 cm2,500 mm <br />2.5 m <br />) +
tree +, shrub +  and subshrub +