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Rothrock's Townsend daisy, Rothrock's townsendia

common Townsend daisy, common townsendia, slender townsendia

Habit Perennials, 1–3 cm (± pulvinate). Perennials, 1–3 cm (± pulvinate).
Stems

± erect;

internodes 0.1–1+ mm, glabrous or ± strigose.

± erect;

internodes 0.1–1 mm, strigose.

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 obovate, (8–)12–25(–40+) × 1–2(–3+) mm, ± fleshy, faces ± strigose to strigillose or glabrate.

Involucres

± hemispheric, 12–28+ mm diam.

± campanulate, 8–12(–20+) mm diam.

Ray florets

18–40;

corollas blue to purplish adaxially, laminae 8–16 mm, glabrous abaxially.

13–34+;

corollas usually white or pinkish, seldom blue, adaxially, laminae 5–7(–12+) mm, abaxially usually glabrous, sometimes sparsely glandular-puberulent.

Disc florets

60–100+;

corollas 3.5–4.5+ mm.

40–80+;

corollas 4–6+ 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.

40–50+ in 4–5+ series, the longer ± lanceolate, 7–9(–12) mm (l/w = 2.5–5), apices acute to attenuate, abaxial faces sparsely strigose or glabrous.

Heads

± sessile or on peduncles 5–25+ mm.

usually ± sessile, rarely on scapiform peduncles 5–15+ mm.

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+ mm, faces glabrous or sparsely hairy (hairs mostly at bases), hair tips glochidiform;

pappi persistent;

on ray cypselae ca. 25 lanceolate or subulate to setiform scales 0–1 or 5–8 mm;

on disc cypselae ca. 30 subulate to setiform scales 5–8 mm.

2n

= 36 (apomicts).

= 18.

Townsendia rothrockii

Townsendia leptotes

Phenology Flowering Aug. Flowering Jun–Jul.
Habitat South slopes Rocky ridges, sandy slopes
Elevation 3600–4000 m (11800–13100 ft) (2300–)2900–3800 m ((7500–)9500–12500 ft)
Distribution
from FNA
CO
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; CO; ID; 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. 203.
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. incana, T. jonesii, T. mensana, T. microcephala, T. minima, T. montana, T. parryi, T. rothrockii, T. scapigera, T. smithii, T. spathulata, T. strigosa, T. texensis
Synonyms T. sericea var. leptotes
Name authority A. Gray ex Rothrock: Rep. U.S. Geogr. Surv., Wheeler 6: 148. (1879) (A. Gray) Osterhout: Muhlenbergia 4: 69. (1908)
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