Heterotheca grandiflora
Heterotheca camporum
silk-grass goldenaster, telegraph weed
lemonyellow false goldenaster
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.
1–30(–100), ascending to erect (sometimes reddish brown, sometimes ± brittle), appressed-strigose, sparsely to moderately long-hirsute, eglandular or sparsely to moderately stipitate-glandular, more densely so distally;
axillary fascicles absent.
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.
proximal cauline subpetiolate to sessile, blades oblanceolate, 38–73 cm × 6–15(–18) mm, bases cuneate, margins flat, sparsely serrate, strigoso-ciliate, with a few long cilia proximally, faces moderately long-strigose, eglandular or sparsely to moderately stipitate-glandular;
distal sessile (usually spreading, sometimes perpendicular), blades usually narrowly to broadly oblanceolate, rarely obovate or ovate, little reduced distally (not stiff), margins sparsely serrate (not long-ciliate), faces moderately strigose, sparsely to moderately stipitate-glandular.
10–65 mm, sparsely to densely hispido-strigose, densely stipitate-glandular;
bracts 0–3, linear-lanceolate to linear, reduced distally.
5–35 mm, short-hispido-strigose, sometimes stipitate-glandular;
bracts 1–3, proximal leaflike, becoming linear-lanceolate, less hairy and more stipitate-glandular distally, larger bracts subtending heads absent or very rare.
campanulo-hemispheric, 6–9 mm.
cylindric to campanulo-hemispheric, 7–9(–10.5) mm.
20–40;
laminae 5–8 × 1–2 mm.
16–29(–38);
laminae 10.5–17(–21.5) × 1–2(–2.6) mm.
30–75;
corollas 4–6 mm, lobes 0.5–0.8 mm.
(23–)32–66;
corolla barely ampliate, 5–6.6 mm, glabrous, lobes 0.5–1 mm, glabrous or glabrate.
in 4–6 series, linear-lanceolate, unequal, margins scarious, faces strigose, densely stipitate-glandular.
in 4–5 series, outer and mid narrowly triangular, unequal, margins hyaline, fimbriate-ciliate apically, faces sparsely strigose, eglandular or sparsely to moderately stipitate-glandular.
10–110+, in corymbiform arrays, becoming paniculiform with age, branches ascending, usually relatively short compared to plant height.
(1–)5–24, usually in open to congested corymbiform arrays, sometimes borne singly, on long peduncular branches.
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.
monomorphic, compressed obconic, 1.7–3.9 mm, ribs 7–10 (often brownish), faces moderately strigose;
pappi off-white, outer of linear scales 0.2–1 mm, inner of bristles 5–7 mm, longest weakly clavate.
= 18.
Heterotheca grandiflora
Heterotheca camporum
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.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Varieties 2 (2 in the flora).
Chance introductions (usually emphemeral) of Heterotheca camporum have occurred in Michigan, New Jersey, and likely other eastern states. Heterotheca camporum has well-developed serrations along the margins of its distal cauline leaves, which no other species has, although basal leaves in some species may have one or two serrations distally.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Plants 35–70 cm; distal stems and peduncles eglandular or sparsely to moderately stipitate-glandular; distal leaves moderately to densely hispido-strigose, usually eglandular, rarely sparsely stipitate-glandular; prairies, sandy banks, limestone bluffs, ledges, along the Mississippi River | var. camporum |
1. Plants 35–140 cm; distal stems and peduncles moderately to densely stipitate-glandular; distal leaves moderately hispido-strigose, sparsely to moderately stipitate-glandular; roadsides, disturbed sandy habitats, stream banks, glades | var. glandulissima |
CA
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