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Sonoran dogweed, Sonoran pricklyleaf

Texas pricklyleaf

Habit Annuals, green, 3–12+ cm, glabrous.
Stems

spreading to ascending or erect.

Leaves

alternate;

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

Peduncles

1–5+ mm, glabrous.

Involucres

obconic to campanulate, 5–6.5 mm.

Ray florets

9–12;

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

Disc florets

ca. 25;

corollas pale yellow, 3–4.5 mm.

Phyllaries

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

Calyculi

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

Cypselae

2.5–3 mm;

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

2n

= 16.

Thymophylla concinna

Thymophylla setifolia

Phenology Flowering spring, following rains.
Habitat Sandy washes and flats, in deserts
Elevation 50–100 m (200–300 ft)
Distribution
from FNA
AZ; Mexico (Sonora)
[WildflowerSearch map]
[BONAP county map]
from FNA
NM; TX; Mexico
[BONAP county map]
Discussion

Varieties 2 (1 in the flora).

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

Source FNA vol. 21, p. 245. FNA vol. 21, p. 240.
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. micropoides, T. pentachaeta, T. tenuiloba, T. tephroleuca
Subordinate taxa
T. setifolia var. greggii
Synonyms Hymenatherum concinnum, Dyssodia concinna Dyssodia setifolia
Name authority (A. Gray) Strother: Sida 11: 376. (1986) Lagasca: Gen. Sp. Pl., 25. (1816)
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