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Sonoran dogweed, Sonoran pricklyleaf

woolly pricklyleaf

Habit Annuals, green, 3–12+ cm, glabrous. Perennials, ashy white, to 15+ cm, arachnose to floccose.
Stems

spreading to ascending or erect.

spreading, often prostrate.

Leaves

alternate;

blades 10–15 mm overall, lobed, lobes (3–)5–9, linear to filiform.

mostly alternate;

blades not lobed, spatulate, 10–25 × 3–6 mm, margins entire or toothed.

Peduncles

1–5+ mm, glabrous.

0–5+ mm, tomentose.

Involucres

obconic to campanulate, 5–6.5 mm.

obconic, 6–7 mm.

Ray florets

9–12;

corollas white to pale yellow, laminae 3–4 × 1–3.5 mm.

10–15;

corollas bright yellow, becoming greenish, laminae 5 × 3 mm.

Disc florets

ca. 25;

corollas pale yellow, 3–4.5 mm.

ca. 60;

corollas yellow, 3 mm.

Phyllaries

8–16, margins of outer distinct less than 1/2 their lengths, abaxial faces glabrous.

12–14, margins of outer distinct less than 1/5 their lengths, abaxial faces tomentose.

Calyculi

0, or of 1–2 subulate bractlets, lengths less than 1/2 phyllaries.

of 3–5 linear bractlets, lengths 1/2+ phyllaries.

Cypselae

2.5–3 mm;

pappi of 10–15 scales (each comprising 5–9 basally connate bristles) 1–2.5 mm.

2.3–3 mm;

pappi of 5 erose scales to 1 mm alternating with 5 lanceolate, 1-aristate scales to 3 mm.

2n

= 16.

= 16.

Thymophylla concinna

Thymophylla micropoides

Phenology Flowering spring, following rains. Flowering year round, following rains.
Habitat Sandy washes and flats, in deserts Calcareous outcrops and derived soils
Elevation 50–100 m (200–300 ft) 50–200+ m (200–700+ ft)
Distribution
from FNA
AZ; Mexico (Sonora)
[WildflowerSearch map]
[BONAP county map]
from FNA
TX; Mexico (Coahuila, Nuevo León, Tamaulipas)
[BONAP county map]
Source FNA vol. 21, p. 245. FNA vol. 21, p. 241.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Pectidinae > Thymophylla Asteraceae > tribe Heliantheae > subtribe Pectidinae > Thymophylla
Sibling taxa
T. acerosa, T. aurea, T. micropoides, T. pentachaeta, T. setifolia, T. tenuiloba, T. tephroleuca
T. acerosa, T. aurea, T. concinna, T. pentachaeta, T. setifolia, T. tenuiloba, T. tephroleuca
Synonyms Hymenatherum concinnum, Dyssodia concinna Gnaphalopsis micropoides, Dyssodia micropoides
Name authority (A. Gray) Strother: Sida 11: 376. (1986) (de Candolle) Strother: Sida 11: 377. (1986)
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