Townsendia rothrockii |
Townsendia incana |
|
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Rothrock's Townsend daisy, Rothrock's townsendia |
hoary Townsend daisy, hoary townsendia, silvery townsendia |
|
Habit | Perennials, 1–3 cm (± pulvinate). | Perennials, (1–)2–8(–12+) cm. |
Stems | ± erect; internodes 0.1–1+ mm, glabrous or ± strigose. |
decumbent to erect; internodes (0.5–)2–6(–12+) mm, usually densely piloso-hirsute, sometimes strigoso-scabrellous (surfaces usually hidden by hairs). |
Leaves | basal and cauline, ± spatulate to oblanceolate, 10–35 × 2–7 mm, ± fleshy, faces sparsely strigose or glabrous. |
basal and cauline, blades spatulate to narrowly oblanceolate, 3–12(–40+) × 1–2(–4+) mm, not fleshy, ± strigoso-scabrellous to strigillose. |
Involucres | ± hemispheric, 12–28+ mm diam. |
± campanulate to hemispheric, (6–)10–15(–20) mm diam. |
Ray florets | 18–40; corollas blue to purplish adaxially, laminae 8–16 mm, glabrous abaxially. |
(8–)13–34+; corollas white or pinkish adaxially, laminae 5–8(–12+) mm, abaxially usually glabrous, sometimes glandular-puberulent at bases. |
Disc florets | 60–100+; corollas 3.5–4.5+ mm. |
60–80+; corollas 4.5–6.5+ mm. |
Phyllaries | 40–60+ in (3–)4–5+ series, the longer obovate to oblanceolate, 7–9+ mm (l/w = 2.5–5), apices obtuse to acute, abaxial faces glabrous. |
16–28+ in 3–4+ series, the longer ± lance-ovate to lanceolate, (6–)8–9(–12+) mm (l/w = 2.5–5), apices acute, abaxial faces strigose. |
Heads | ± sessile or on peduncles 5–25+ mm. |
at tips of stems (usually surpassed by leaves). |
Cypselae | 4 mm, faces nearly glabrous (discs) or sparsely hairy (ray, hairs mostly at bases), hair tips glochidiform; pappi persistent; on ray cypselae 12–20 lanceolate to subulate scales 0.5–1.5 mm; on disc cypselae 15–30 subulate to setiform scales 3–6 mm. |
3.5–4.5+ mm, faces hairy, hair tips glochidiform; pappi persistent; on ray cypselae 15–30 lanceolate or subulate to setiform scales 0.3–0.6 or 4–6+ mm; on disc cypselae 15–30+ subulate to setiform scales 4–6+ mm. |
2n | = 36 (apomicts). |
= 18. |
Townsendia rothrockii |
Townsendia incana |
|
Phenology | Flowering Aug. | Flowering Apr–Jul. |
Habitat | South slopes | Sandy soils, rocky benches, shales, with pinyons and junipers |
Elevation | 3600–4000 m (11800–13100 ft) | 1100–2200 m (3600–7200 ft) |
Distribution |
CO
|
AZ; CO; MT; NM; NV; UT; WY
|
Discussion | Of conservation concern. The types of Townsendia rothrockii and T. glabella may be conspecific. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 20, p. 202. | FNA vol. 20, p. 199. |
Parent taxa | Asteraceae > tribe Astereae > Townsendia | Asteraceae > tribe Astereae > Townsendia |
Sibling taxa | ||
Synonyms | T. arizonica | |
Name authority | A. Gray ex Rothrock: Rep. U.S. Geogr. Surv., Wheeler 6: 148. (1879) | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 305. (1840) |
Web links |