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Black Rock Townsend daisy

Hooker's Townsend daisy, Hooker's townsendia

Habit Perennials, 3–8(–12+) cm (usually ± pulvinate). Perennials, 1–3 cm (± pulvinate).
Stems

± erect;

internodes 0.1–1 mm, ± scabrellous.

± erect;

internodes 0.1–1 mm, ± strigose.

Leaves

basal and cauline, ± spatulate to oblanceolate, 15–50(–80) × 2–6(–11) mm, little, if at all, fleshy, faces ± scabrellous.

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

± hemispheric to campanulate, 10–15 mm diam.

± campanulate, 8–18+ mm diam.

Ray florets

12–21;

corollas white adaxially, laminae 6–12+ mm, glabrous abaxially.

15–35;

corollas white adaxially, laminae 8–12+ mm, glabrous abaxially.

Disc florets

60–80+;

corollas 3.5–5 mm.

120–180+;

corollas 4–5(–6+) mm.

Phyllaries

14–26 in 2–3+ series, the longer lance-ovate to lanceolate, 9–11 mm (l/w = 3–5), apices attenuate, abaxial faces piloso-strigose to strigose.

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

on scapiform peduncles 30–80(–120) mm.

± sessile.

Cypselae

2.5–3.5 mm, faces hairy, hair tips entire;

pappi persistent, 16–20+ lanceolate to subulate scales 0.2–0.8 mm (± connate).

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.

= 18.

Townsendia smithii

Townsendia hookeri

Phenology Flowering May. Flowering Mar–Jun.
Habitat Volcanic soils, pinyon or yellow pines Gravelly benches, sandy slopes
Elevation 2000–2400 m (6600–7900 ft) 700–1800 m (2300–5900 ft)
Distribution
from FNA
AZ
[BONAP county map]
from FNA
AK; CO; ID; MT; ND; NE; SD; UT; WY; AB; BC; SK; YT
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 20, p. 202. FNA vol. 20, p. 200.
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. rothrockii, T. scapigera, 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. 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
Synonyms T. nuttallii
Name authority L. M. Shultz & A. H. Holmgren: Brittonia 32: 144, fig. 1. (1980) Beaman: Contr. Gray Herb. 183: 95, plates 17, 20, figs. 5, 6. (1957)
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