Heterotheca rutteri

(Rothrock) Shinners

Field & Lab. 19: 71. 1951.

Common names: Huachuca or Rutter’s goldenaster
Conservation concern
Basionym: Chrysopsis villosa var. rutteri Rothrock Rep. U.S. Geogr. Surv., Wheeler, 142. 1879
Synonyms: Chrysopsis foliosa var. sericeovillosissima A. Gray Chrysopsis rutteri (Rothrock) Greene
Treatment appears in FNA Volume 20. Treatment on page 242. Mentioned on page 231, 232, 233.

Perennials, 30–55 cm; taprooted. Stems 1–10+, ascending to erect (sometimes reddish-brown), moderately to densely strigose, sparsely to mederately long-hirsute, sometimes proximally glabrescent with age, eglandular or sparsely stipitate-glandular beneath hairs. Leaves: proximal cauline subpetiolate to sessile, blades oblanceolate, 125–250 × 4–9 mm, bases attenuate to rounded, margins flat or weakly undulate, entire, strigoso-ciliate, a few longer hispid cilia near bases, apices acute, faces densely long-strigose (silvery white); distal sessile, blades narrowly ovate to lanceolate, 17–25 × 4.5–8.5 mm, reduced distally, bases narrowly to broadly cuneate, margins entire, large spreading hispido-strigose cilia numerous, apices sharply acute, mucronate-spinulose, faces densely long-strigose, sparsely stipitate-glandular. Heads 4–10, in open corymbiform arrays. Peduncles 10–60+ mm, strigoso-canescent, stipitate-glandular; bracts 6–10, proximal lanceolate, leafy, strigose, becoming linear, less hairy, and more glandular near heads, 1–4+ larger, lanceolate to narrowly ovate, leafy bracts (10–15 × 1.8–4.5 mm; bases sometimes attenuate to winged subpetiolate) subtending heads. Involucres cylindric to campanulate, 8.5–10.5 mm. Phyllaries in 4–5 series, lanceolate to triangular-lanceolate, unequal, scarious, moderately to densely strigose, sparsely glandular. Ray-florets 15–35; laminae 12–16 × 1–2 mm. Disc-florets 23–65; corollas barely ampliate, 6.5–8.3 mm, lobes 0.6–0.8 mm, lobes glabrous or sparsely hairy (0.1–0.5 mm). Cypselae monomorphic, obconic, compressed, 3–4 mm, ribs 7–10, sparsely moderately densely strigose; pappi off-white, outer of linear scales 0.5–1 mm, inner of 35–45 attenuate bristles 7–9 mm, longest attenuate. 2n = 18.


Phenology: Flowering (Aug–)Sep(–Oct).
Habitat: Grasslands with mesquite, grassy understory in oak woodlands, grassy flood plains, sandy, loamy soils
Elevation: 1000–1500 m

Discussion

Of conservation concern.

Heterotheca rutteri grows in the vicinity of the Huachuca and Santa Rita mountains of southern Arizona and adjacent Sonora, Mexico. It is distinguished by its light green to silvery white, densely hairy, narrowly ovate to lanceolate leaves, sharply acute distal leaves, and large leaflike bracts with similar (or more glandular) indument subtending the showy heads. The species is included on the BLM Sensitive Species List for Arizona.

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 rutteri"
not tailed +, rounded +  and obtuse +
mucronate-spinulose +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
corymbiform +  and open +
indeterminate +  and determinate +
John C. Semple +
(Rothrock) Shinners +
cuneate +, attenuate +  and rounded +
Chrysopsis villosa var. rutteri +
compound +  and simple +
1.7 cm17 mm <br />0.017 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
narrowly ovate;lanceolate +
reduced +
4.5mm;8.5mm +
rugulose +  and muricate +
barbellulate +  and barbellate +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
rhizomatous +  and taprooted +
hispido-strigose +
Huachuca or Rutter’s goldenaster +
not 2-lipped +  and actinomorphic +
ampliate +
0.65 cm6.5 mm <br />0.0065 m <br /> (0.83 cm8.3 mm <br />0.0083 m <br />) +
compressed +  and obconic +
fertile +  and bisexual +
Ariz. +  and Mexico (Sonora) +
1000–1500 m +
stipitate-glandular +  and long-strigose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Grasslands with mesquite, grassy understory in oak woodlands, grassy flood plains, sandy, loamy soils +
paniculiform +
in corymbiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
tan;rusty brown +
attenuate +  and clavate +
cylindric;campanulate +
0.85 cm8.5 mm <br />0.0085 m <br /> (1.05 cm10.5 mm <br />0.0105 m <br />) +
12mm;16mm +
sessile +  and petiolate +
cauline +  and basal +
erect;spreading +
hairy +  and glabrous +
lanceolate +, triangular +  and deltate +
stipitate-glandular +  and strigose +
undulate +  and flat +
2-carpellate +
in 3 +  and 4 series +
stipitate-glandular +  and strigoso-canescent +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
Flowering (Aug–)Sep(–Oct). +
lanceolate +  and triangular-lanceolate +
ovate-oblanceolate +
hairy +  and strigose +
lanceolate +  and narrowly ovate +
subpetiolate +  and sessile +
Field & Lab. +
bearing subulate enations +, hairy +  and bristly +
subulate;convex +
7 +  and 10 +
3 +  and 40 +
linear +  and linear-lanceolate or triangular +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
exalbuminous +
Conservation concern +
ascending +  and erect +
1 +  and 10 +
appendaged +  and truncate +
papillate +  and smooth +
Chrysopsis foliosa var. sericeovillosissima +  and Chrysopsis rutteri +
Heterotheca rutteri +
Heterotheca +
species +
60 cm600 mm <br />0.6 m <br /> (200 cm2,000 mm <br />2 m <br />) +
30 cm300 mm <br />0.3 m <br /> (55 cm550 mm <br />0.55 m <br />) +
tree +, shrub +  and subshrub +