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Rothrock's Townsend daisy, Rothrock's townsendia

Texas Townsend daisy

Habit Perennials, 1–3 cm (± pulvinate). Biennials (sometimes persisting), 15–25+ cm.
Stems

± erect;

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

decumbent to erect;

internodes 5–20+ mm, strigose.

Leaves

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

basal and cauline, blades oblanceolate to lance-linear, 20–45(–60+) × 2–4(–6+) mm, not fleshy, faces ± strigose.

Involucres

± hemispheric, 12–28+ mm diam.

± campanulate to hemispheric, 12–15(–20+) mm diam.

Ray florets

18–40;

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

25–40+;

corollas white or purplish adaxially, laminae 9–18 mm, abaxially usually glabrous, sometimes glandular-puberulent.

Disc florets

60–100+;

corollas 3.5–4.5+ mm.

80–120+;

corollas 3.5–5 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.

40–44 in 4–5+ series, the longer ± lanceolate, 5–9+ mm (l/w = 2.5–5), apices acute to attenuate (soft, not apiculate), 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 mm, faces hairy, hair tips glochidiform;

pappi persistent;

on ray cypselae ± 20 lanceolate to subulate scales 0.5–0.8(–2+) mm;

on disc cypselae 16–24 subulate to setiform scales 5 mm.

2n

= 36 (apomicts).

= 18.

Townsendia rothrockii

Townsendia texensis

Phenology Flowering Aug. Flowering May–Jun.
Habitat South slopes Cherts, limestone slopes
Elevation 3600–4000 m (11800–13100 ft) 1200 m (3900 ft)
Distribution
from FNA
CO
[WildflowerSearch map]
[BONAP county map]
from FNA
OK; TX
[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. 196.
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. leptotes, T. mensana, T. microcephala, T. minima, T. montana, T. parryi, T. rothrockii, T. scapigera, T. smithii, T. spathulata, T. strigosa
Name authority A. Gray ex Rothrock: Rep. U.S. Geogr. Surv., Wheeler 6: 148. (1879) Larsen: Ann. Missouri Bot. Gard. 14: 15, plate 3. (1927)
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