Townsendia microcephala |
Townsendia hookeri |
|
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smallhead Townsend daisy |
Hooker's Townsend daisy, Hooker's townsendia |
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Habit | Perennials, 1–3 cm (usually ± pulvinate). | Perennials, 1–3 cm (± pulvinate). |
Stems | ± erect; internodes 0.1–1 mm, ± villous. |
± erect; internodes 0.1–1 mm, ± strigose. |
Leaves | basal and cauline, ± spatulate to oblanceolate, 3–8(–18) × 1–2.5 mm (not fleshy), faces ± villous. |
basal and cauline, blades narrowly oblanceolate to linear, 5–25(–40+) × 1–1.5(–3) mm, fleshy, faces ± strigoso-sericeous, little, if at all. |
Involucres | ± campanulate, 4–8 mm diam. |
± campanulate, 8–18+ mm diam. |
Ray florets | 13–17; corollas white adaxially, laminae 5–8 mm, glabrous abaxially. |
15–35; corollas white adaxially, laminae 8–12+ mm, glabrous abaxially. |
Disc florets | number unknown; corollas 4 mm. |
120–180+; corollas 4–5(–6+) mm. |
Phyllaries | ca. 26 in 3–4 series, the longer ± lanceolate, 5–8 mm (l/w = 3–5), apices acute, abaxial faces ± strigose to villous. |
50–65+ in 5+ series, the longer ± lance-linear, 7–11(–13) mm (l/w = 6–9), apices attenuate, abaxial faces sparsely strigose or glabrate. |
Heads | ± sessile. |
± sessile. |
Cypselae | 3–4 mm, faces glabrous or glabrate; pappi readily falling, of 15–20 subulate to setiform scales 3–5 mm (± connate basally). |
3.5–4.5 mm, faces hairy, hair tips glochidiform; pappi persistent; on ray cypselae ca. 30 subulate to setiform scales (1–)5–7 mm; on disc cypselae ca. 30 subulate to setiform scales 5.5–7.5+ mm. |
2n | = 18. |
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Townsendia microcephala |
Townsendia hookeri |
|
Phenology | Flowering Jul. | Flowering Mar–Jun. |
Habitat | Rocky slopes | Gravelly benches, sandy slopes |
Elevation | 2600 m (8500 ft) | 700–1800 m (2300–5900 ft) |
Distribution |
WY |
AK; CO; ID; MT; ND; NE; SD; UT; WY; AB; BC; SK; YT
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Discussion | Of conservation concern. The type of Townsendia microcephala may prove to be conspecific with that of T. spathulata. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 20, p. 196. | FNA vol. 20, p. 200. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | T. nuttallii | |
Name authority | Dorn: Madroño 39: 189, fig. 1. (1992) | Beaman: Contr. Gray Herb. 183: 95, plates 17, 20, figs. 5, 6. (1957) |
Web links |