Tonestus pygmaeus |
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pygmy goldenweed, pygmy serpentweed |
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Habit | Perennials, loosely cespitose, 1–9 cm; with branched caudices surmounting well-developed taproots. |
Stems | densely hairy, sometimes also stipitate-glandular. |
Leaves | basal blades linear to spatulate, 10–50(–95) × 1.5–6 mm; cauline blades oblong to broadly lanceolate, 15–34 × 3–7 mm, gradually reduced distally; 3–5-nerved, margins entire, ciliate, sometimes stipitate-glandular, faces eglandular or sparsely stipitate-glandular. |
Peduncles | 3–8 mm. |
Involucres | broadly campanulate, 8–20 × 7–12 mm. |
Ray florets | 10–16(–35); laminae elliptic, 6.5–8.5 × 1.5–3.5 mm. |
Disc florets | 43–66; corollas narrowly funnelform, 4.5–7.5 mm, lobes erect to spreading, 0.8–1.2 mm, lengths ca. 1/7 corollas; anthers 2.2–2.8 mm; style-branch appendages lanceolate, 0.8–1.1 × 0.3 mm wide, stigmatic lines 0.6–1 mm. |
Phyllaries | 16–34, in 3–4 (–5) series, 1- or weakly 3–5-nerved, ± equal, margins ciliolate at least distally; outer and mid green, ovate to oblong, 4.5–10.5 × 1.5–5.5 mm, foliaceous, apices rounded to obtuse, faces sparsely stipitate-glandular distally; inner green or usually anthocyanic, linear to narrowly oblong, 5–9 × 0.9–4 mm, chartaceous proximally, margins scarious, often fimbriate, sometimes stipitate-glandular, apices acute to acuminate, sometimes reflexed, faces sparsely stipitate-glandular distally. |
Heads | 1(–2). |
Cypselae | cylindric, 2–5 mm, 8–9-nerved, faces villous; pappus bristles ± 34–51, flexible. |
2n | = 18. |
Tonestus pygmaeus |
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Phenology | Flowering and fruiting early–late summer. |
Habitat | Meadows, fellfields, talus slopes, rock crevices, dwarf coniferous forests in alpine and upper subalpine communities, on soils of usually granitic, sometimes limestone origin |
Elevation | 3100–4100 m (10200–13500 ft) |
Distribution |
CO; MT; NM; WY
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Discussion | Tonestus pygmaeus is uncommon in Wyoming, known only from the Snowy Range of the Medicine Bow Mountains. Attribution of this species to Montana is based on historic collections. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 183. |
Parent taxa | Asteraceae > tribe Astereae > Tonestus |
Sibling taxa | |
Synonyms | Stenotus pygmaeus, Haplopappus pygmaeus |
Name authority | (Torrey & A. Gray) A. Nelson: Bot. Gaz. 37: 262. (1904) |
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