Heterotheca monarchensis

D. A. York

in J. C. Semple, Rev. Heterotheca Phyllotheca, 52, fig. 20. 1996.

Common names: Monarch goldenaster
Treatment appears in FNA Volume 20. Treatment on page 241. Mentioned on page 231, 232, 238.

Perennials, 9–17.5 cm; taprooted. Stems 1–25+, ascending-erect, moderately to densely hispid. Leaves: proximal cauline petiolate, blades oblanceolate to obovate, 11–17 (–25) × 2–3.7 (–5) mm, bases cuneate, margins ± undulate, entire, strigoso-ciliate (proximal cilia long, spreading, numerous), apices acute, faces moderately to densely hispido-strigose, sparsely stipitate-glandular; distal narrowly oblanceolate, little reduced distally. Heads 1–2 (–5), borne singly or in corymbiform arrays, branches ascending. Peduncles 2–5 (–10) mm, densely hispid, sparsely stipitate-glandular; bracts leaflike, sometimes surpassing involucres, those subtending heads narrower than leaves. Involucres cylindro-turbinate (campanulate upon drying), 6–7.5 (–8.5) mm. Phyllaries in 3–4 series, unequal (outer lengths 1/4–1/2 inner), margins scarious, faces moderately strigose, sparsely stipitate-glandular. Ray-florets (8–) 12–16 (–19); laminae 10–14 × 1–2 mm. Disc-florets 30–45; corollas ± ampliate, 5–6 mm, tubes sparsely pilose distally, lobes 0.45–0.7 mm, sparsely pilose (hairs 0.2–0.6 mm). Cypselae monomorphic, obconic, somewhat compressed, 2–3 mm, ribs 9–11, shallow, faces moderately strigose; pappi off-white, outer of linear scales 0.25–0.5 mm, inner of 25–40 bristles 5–6.5 mm, longest weakly clavate. 2n = 18.


Phenology: Flowering (May–)Jun–Oct.
Habitat: Cracks, ledges, and flats on limestone, coarse sandy flats at base of cliffs, in single-leaf pine and yucca scrub communities
Elevation: 1000–1900 m

Discussion

Of conservation concern.

Heterotheca monarchensis grows only in Kings River Canyon, northeastern Fresno County. It can be superficially similar to densely hairy specimens of H. sessiliflora var. bolanderioides and to individuals of subsp. sessiliflora that are silvery white, but those usually have ovate-lanceolate distal cauline leaves, while H. monarchensis has oblanceolate ones. All three can have heads partially surrounded by distal leaves and long, subtending, leaflike bracts. Their ranges do not overlap, however. Specimens of H. monarchensis can be confused with H. villosa varieties; the latter lack the long, thin corolla hairs. The species has a small number of known populations and is therefore of conservation concern.

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 monarchensis"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
John C. Semple +
D. A. York +
cuneate +
compound +  and simple +
1.7 cm17 mm <br />0.017 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.37 cm3.7 mm <br />0.0037 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
1.1 cm11 mm <br />0.011 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
oblanceolate;obovate +
2mm;3.7mm +
rugulose +  and muricate +
barbellulate +  and barbellate +
0.5 cm5 mm <br />0.005 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
rhizomatous +  and taprooted +
Monarch goldenaster +
not 2-lipped +  and actinomorphic +
ampliate +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
compressed +  and obconic +
fertile +  and bisexual +
oblanceolate +
1000–1900 m +
strigose +, stipitate-glandular +  and hispido-strigose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Cracks, ledges, and flats on limestone, coarse sandy flats at base of cliffs, in single-leaf pine and yucca scrub communities +
paniculiform +
in corymbiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
tan;rusty brown +
attenuate +  and clavate +
0.75 cm7.5 mm <br />0.0075 m <br /> (0.85 cm8.5 mm <br />0.0085 m <br />) +
cylindro-turbinate +
0.6 cm6 mm <br />0.006 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
10mm;14mm +
sessile +  and petiolate +
cauline +  and basal +
erect;spreading +
lanceolate +, triangular +  and deltate +
stipitate-glandular +  and strigose +
undulate +
2-carpellate +
in 3 +  and 4 series +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
stipitate-glandular +  and hispid +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering (May–)Jun–Oct. +
lanceolate +  and linear-lanceolate +
ovate-oblanceolate +
in J. C. Semple, Rev. Heterotheca Phyllotheca, +
bearing subulate enations +, hairy +  and bristly +
subulate;convex +
shallow +
9 +  and 11 +
3 +  and 40 +
linear +  and linear-lanceolate or triangular +
0.025 cm0.25 mm <br />2.5e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
exalbuminous +
ascending-erect +
1 +  and 25 +
appendaged +  and truncate +
papillate +  and smooth +
Ammodia +, Chrysopsis subg. Ammodia +  and Heterotheca sect. Ammodia +
Heterotheca monarchensis +
Heterotheca +
species +
60 cm600 mm <br />0.6 m <br /> (200 cm2,000 mm <br />2 m <br />) +
9 cm90 mm <br />0.09 m <br /> (17.5 cm175 mm <br />0.175 m <br />) +
tree +, shrub +  and subshrub +