Heterotheca pumila

(Greene) Semple

Brittonia 39: 383. 1987.

Common names: Alpine goldenaster
Endemic
Basionym: Chrysopsis pumila Greene Erythea 2: 95. 1894
Synonyms: Chrysopsis alpicola Rydberg Chrysopsis alpicola var. glomerata A. Nelson Chrysopsis cooperi
Treatment appears in FNA Volume 20. Treatment on page 245. Mentioned on page 231, 233, 234, 243, 249.

Perennials, (7–) 12.5–30 (–38) cm; taprooted. Stems 1–75+, decumbent to ascending or erect (sometimes reddish-brown), moderately appressed-strigose, sparsely long-hirsute. Leaves: proximal cauline petiolate, blades narrowly oblanceolate, 25–56 × 4–9 mm, not stiff, bases attenuate, margins flat, entire, strigoso-ciliate, with a few, proximal, long-hispido-strigose cilia, faces ± densely strigose, sparsely stipitate-glandular; distal cauline sessile, linear-oblanceolate, little reduced to slightly longer distally, surpassing heads, margins entire, rarely slightly undulate, apices acute, faces moderately strigose, sparsely to moderately stipitate-glandular. Heads 1–9 (–20), borne singly or in corymbiform arrays. Peduncles 2–10 mm, moderately strigoso-canescent, long-hispid hairs few, sparsely stipitate-glandular; bracts grading from leaves, reduced proximal to heads, those subtending heads usually 1–5, narrowly oblanceolate, (large) 6.5–15 × 0.9–2.5 mm, leaflike. Involucres cylindric to campanulate, (6.3–) 7.6–12 mm. Phyllaries in 4–5 series, slightly reddish purple distally, lanceolate, unequal, margins scarious, faces moderately strigose, eglandular or sparsely stipitate-glandular. Ray-florets 10–23; laminae (8–) 10–15 × 1–2.5 mm. Disc-florets (16–) 24–60 (–73); corollas barely ampliate, 4.6–7.1 mm, throats glabrous, lobes 0.5–1 mm, glabrate (hairs 0.1–0.25 mm). Cypselae monomorphic, obconic, compressed, 1.7–3 mm, ribs 7–11, faces sparsely to moderately strigose; pappi off-white, outer of linear scales 0.25–1 mm, inner of 35–45 bristles 4.7–7 mm, longest attenuate. 2n = 18, 36.


Phenology: Flowering Jul–Aug(–Sep).
Habitat: Granitic outcrops, roadsides, rocky soils, clay or shale soils, subalpine and alpine
Elevation: 2900–3800 m

Discussion

Heterotheca pumila grows in subalpine and alpine sites in Colorado, southeastern Utah (Lasalle Mountains), and southern Wyoming, where it is very rare. It is most similar to H. villosa var. minor, which in the range of sympatry has larger heads but smaller distal cauline leaves than are typically found in H. pumila. Reports of occurrence of H. pumila from Arizona and New Mexico are based on narrow-leaved plants of H. fulcrata var. amplifolia with small ovate-lanceolate bracts subtending the heads.

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 pumila"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
John C. Semple +
(Greene) Semple +
attenuate +
Chrysopsis pumila +
compound +  and simple +
2.5 cm25 mm <br />0.025 m <br /> (5.6 cm56 mm <br />0.056 m <br />) +
oblanceolate +
4mm;9mm +
rugulose +  and muricate +
reduced +
barbellulate +  and barbellate +
0.47 cm4.7 mm <br />0.0047 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
rhizomatous +  and taprooted +
long-hispido-strigose +
Alpine goldenaster +
not 2-lipped +  and actinomorphic +
ampliate +
0.46 cm4.6 mm <br />0.0046 m <br /> (0.71 cm7.1 mm <br />0.0071 m <br />) +
compressed +  and obconic +
fertile +  and bisexual +
linear-oblanceolate +
reduced +  and slightly longer +
Colo. +, Utah +  and Wyo. +
2900–3800 m +
strigose +, stipitate-glandular +, moderately strigose +  and sparsely moderately stipitate-glandular +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Granitic outcrops, roadsides, rocky soils, clay or shale soils, subalpine and alpine +
stipitate-glandular +  and long-hispid +
paniculiform +
in corymbiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
tan;rusty brown +
attenuate +  and clavate +
0.63 cm6.3 mm <br />0.0063 m <br /> (0.76 cm7.6 mm <br />0.0076 m <br />) +
cylindric;campanulate +
0.76 cm7.6 mm <br />0.0076 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
10mm;15mm +
1mm;2.5mm +
sessile +  and petiolate +
cauline +  and basal +
erect;spreading +
lanceolate +, triangular +  and deltate +
stipitate-glandular +  and strigose +
undulate +
2-carpellate +
in 3 +  and 4 series +
strigoso-canescent +
0.2 cm2 mm <br />0.002 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering Jul–Aug(–Sep). +
reddish purple +
lanceolate +
ovate-oblanceolate +
bearing subulate enations +, hairy +  and bristly +
subulate;convex +
7 +  and 11 +
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 +
decumbent +  and ascending or erect +
1 +  and 75 +
appendaged +  and truncate +
papillate +  and smooth +
0.65 cm6.5 mm <br />0.0065 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.9mm +  and 2.5mm +
Chrysopsis alpicola +, Chrysopsis alpicola var. glomerata +  and Chrysopsis cooperi +
Heterotheca pumila +
Heterotheca +
species +
30 cm300 mm <br />0.3 m <br /> (38 cm380 mm <br />0.38 m <br />) +
12.5 cm125 mm <br />0.125 m <br /> (30 cm300 mm <br />0.3 m <br />) +
tree +, shrub +  and subshrub +