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Rothrock's Townsend daisy, Rothrock's townsendia

smooth Townsend daisy

Habit Perennials, 1–3 cm (± pulvinate). Biennials or perennials, 10–35(–75+) cm (usually rhizomatous and/or stoloniferous).
Stems

± erect;

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

erect;

internodes (5–)10–15(–35) mm, strigillose.

Leaves

basal and cauline, ± spatulate to oblanceolate, 10–35 × 2–7 mm, ± fleshy, faces sparsely strigose or glabrous.

basal and cauline, blades spatulate to oblanceolate or lance-linear, 15–45(–75+) × 2–10(–20) mm, not fleshy (margins strigoso-ciliolate), glabrous or glabrate.

Involucres

± hemispheric, 12–28+ mm diam.

± hemispheric or broader, 12–18+ mm diam.

Ray florets

18–40;

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

20–34+;

corollas usually white or pinkish adaxially (abaxially blue to lavender), laminae 10–15(–25+) mm, glabrous abaxially.

Disc florets

60–100+;

corollas 3.5–4.5+ mm.

80–150+;

corollas 4 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.

30–45 in 4–6+ series, the longer obovate to lance-ovate or lanceolate, 10–12(–14) mm (l/w = 3–5), apices obtuse to acute (some or all hard, ± apiculate), abaxial faces sparsely strigillose or glabrous.

Heads

± sessile or on peduncles 5–25+ mm.

at tips of stems (seldom 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.

3–4(–5) mm, faces glabrous or ± stipitate-glandular, hair tips not forked or glochidiform;

pappi persistent, each a bidentate corona 0.1–0.4(–0.8) mm.

2n

= 36 (apomicts).

= 18.

Townsendia rothrockii

Townsendia formosa

Phenology Flowering Aug. Flowering Jul–Aug(–Sep).
Habitat South slopes Meadows, yellow-pine forests
Elevation 3600–4000 m (11800–13100 ft) 2400–2600 m (7900–8500 ft)
Distribution
from FNA
CO
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM
[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. 197.
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. glabella, T. grandiflora, T. gypsophila, T. hookeri, T. incana, 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
Name authority A. Gray ex Rothrock: Rep. U.S. Geogr. Surv., Wheeler 6: 148. (1879) Greene: Leafl. Bot. Observ. Crit. 1: 213. (1906)
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