Heterotheca canescens

(de Candolle) Shinners

Field & Lab. 19: 68. 1951.

Common names: Hoary goldenaster
Endemic
Basionym: Haplopappus canescens de Candolle in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 349. 1836 (as Aplopappus)
Synonyms: Chrysopsis berlandieri Greene Chrysopsis canescens (de Candolle) Torrey & A. Gray Chrysopsis villosa var. canescens (de Candolle) A. Gray
Treatment appears in FNA Volume 20. Treatment on page 246. Mentioned on page 231, 233, 247, 249.

Perennials, 15–40 (–65) cm; taprooted, frequently rhizomatous (clonal). Stems 1–75, ascending to erect (proximaly sometimes reddish-brown, often whitish due to pubescence, sometimes brittle), often short-branched in distal 1/2, usually sparsely long-hispid (more so in tetraploids), distally strigoso-canescent, eglandular (axillary leaf fascicles often present). Leaves generally ascending, congested; proximal cauline petiolate or subsessile, blades oblanceolate, 19–32 × 2–6 mm, bases convex-cuneate to attenuate, margins flat, entire, strigoso-ciliate, proximally long-hispido-strigose, apices acute, faces densely strigose, long-hispid hairs few, eglandular; distal sessile, usually silvery gray-green, blades linear-oblanceolate, 11–29 × 2–5 mm, little reduced distally, apices acute, faces very to extremely densely strigoso-canescent (90–200 hairs/mm²; silvery-whitish), long-hispid hairs usually few, eglandular. Heads 1–9 (–15), borne singly or in corymbiform arrays, branches ascending. Peduncles 2–10 mm, densely strigose, usually sparsely hispid; bracts grading from leaves, proximal oblanceolate, sometimes little reduced distally; long, linear-oblancelate, leaflike bracts often subtending heads. Involucres cylindric to narrowly campanulate, 5–7 (–7.5) mm (shorter than disc-florets). Phyllaries in 4–6 series, linear-lanceolate to lanceolate, unequal (outer lengths 1/5–1/4 inner), margins scarious, distally ciliate and reddish purple, faces moderately strigose, eglandular. Ray-florets 10–22; laminae 5–9 (–10.5) × 0.8–1.4 mm. Disc-florets (14–) 22–40 (–50); corollas ± ampliate, 4.7–6.5 mm, throats glabrous, lobes 0.5–0.75 mm, lobes sparsely pilose (hairs 0.1–0.25 mm). Cypselae monomorphic, obconic, compressed, 1.2–3.1 mm, ribs 6–10 (sometimes brownish), faces moderately strigose; pappi off-white, outer of linear scales 0.25–0.5 mm, inner of 25–40 bristles 5–7.5 mm, longest weakly clavate. 2n = 18, 36.


Phenology: Flowering May–Jul(–Sep).
Habitat: Sandy calcareous clay soils, igneous soils, sandy gypsiferous loamy soils, gravelly soils, outcrops, prairies, open hills, roadsides, fencerows
Elevation: 100–1800 m

Distribution

V20-538-distribution-map.gif

Kans., N.Mex., Okla., Tex.

Discussion

Heterotheca canescens grows in southcentral Kansas, eastern New Mexico, western Oklahoma, and much of western Texas, with disjunct populations in the Davis and Glass mountains of trans-Pecos Texas. Disjunct collections putatively from Holt County, Missouri, are of questionable provenance. Heterotheca canescens is silvery gray-green due to the very dense indument of appressed hairs (usually more than 100 per mm2). Tetraploids have more hispid stems and more branched arrays than diploids and can be similar to forms of H. stenophylla var. angustifolia that grow sympatrically in west Texas and Oklahoma. The tetraploids of both taxa apparently hybidize, forming local swarms of parentlike and hybrid individuals.

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 canescens"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
John C. Semple +
(de Candolle) Shinners +
convex-cuneate +  and attenuate +
Haplopappus canescens +
compound +  and simple +
1.1 cm11 mm <br />0.011 m <br /> (2.9 cm29 mm <br />0.029 m <br />) +
linear-oblanceolate;oblanceolate +
reduced +
2mm;5mm +
rugulose +  and muricate +
barbellulate +  and barbellate +
0.5 cm5 mm <br />0.005 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
rhizomatous +  and taprooted +
Hoary goldenaster +
not 2-lipped +  and actinomorphic +
ampliate +
0.47 cm4.7 mm <br />0.0047 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
compressed +  and obconic +
fertile +  and bisexual +
silvery gray-green +
Kans. +, N.Mex. +, Okla. +  and Tex. +
100–1800 m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sandy calcareous clay soils, igneous soils, sandy gypsiferous loamy soils, gravelly soils, outcrops, prairies, open hills, roadsides, fencerows +
long-hispid +  and strigoso-canescent +
paniculiform +
in corymbiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
tan;rusty brown +
attenuate +  and clavate +
0.7 cm7 mm <br />0.007 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
cylindric;narrowly campanulate +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.9 cm9 mm <br />0.009 m <br /> (1.05 cm10.5 mm <br />0.0105 m <br />) +
0.8mm;1.4mm +
sessile +  and petiolate +
cauline +  and basal +
erect;spreading +
lanceolate +, triangular +  and deltate +
ciliate +  and strigoso-ciliate +
reddish purple +
long-hispido-strigose +
2-carpellate +
in 3 +  and 4 series +
hispid +  and strigose +
0.2 cm2 mm <br />0.002 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering May–Jul(–Sep). +
linear-lanceolate +  and lanceolate +
ovate-oblanceolate +
linear-oblancelate +  and oblanceolate +
subsessile +  and petiolate +
Field & Lab. +
bearing subulate enations +, hairy +  and bristly +
subulate;convex +
6 +  and 10 +
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 +
eglandular +  and short-branched +
ascending +  and erect +
1 +  and 75 +
appendaged +  and truncate +
papillate +  and smooth +
Chrysopsis berlandieri +, Chrysopsis canescens +  and Chrysopsis villosa var. canescens +
Heterotheca canescens +
Heterotheca +
species +
rhizomatous +  and taprooted +
40 cm400 mm <br />0.4 m <br /> (65 cm650 mm <br />0.65 m <br />) +
15 cm150 mm <br />0.15 m <br /> (40 cm400 mm <br />0.4 m <br />) +
tree +, shrub +  and subshrub +