Thymophylla concinna |
Thymophylla micropoides |
|
---|---|---|
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 |
AZ; Mexico (Sonora)
|
TX; Mexico (Coahuila, Nuevo León, Tamaulipas) |
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 | ||
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) |
Web links |