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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
from FNA
CO
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CO; MT; NM; NV; UT; WY
[WildflowerSearch map]
[BONAP county map]
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
T. annua, T. aprica, T. condensata, T. eximia, T. exscapa, T. fendleri, T. florifera, T. formosa, T. glabella, T. grandiflora, T. gypsophila, T. hookeri, T. incana, T. jonesii, T. leptotes, T. mensana, T. microcephala, T. minima, T. montana, T. parryi, T. scapigera, T. smithii, T. spathulata, T. strigosa, T. texensis
T. annua, T. aprica, T. condensata, T. eximia, T. exscapa, T. fendleri, T. florifera, T. formosa, T. glabella, T. grandiflora, T. gypsophila, T. hookeri, T. jonesii, T. leptotes, T. mensana, T. microcephala, T. minima, T. montana, T. parryi, T. rothrockii, T. scapigera, T. smithii, T. spathulata, T. strigosa, T. texensis
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)
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