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bristleleaf pricklyleaf, Dahlburg-daisy, shooting star

Photo is of parent taxon

Wright's pricklyleaf

Habit Annuals (rarely persisting), green, to 30 cm, glabrous or sparsely hirtellous.
Stems

decumbent to erect.

Leaves

mostly alternate (sometimes opposite at 1–3 proximal nodes);

blades usually lobed, 12–28 mm overall, lobes 7–15, linear to filiform, pliable (blades mostly not lobed in var. wrightii).

linear to spatulate, usually entire, rarely with 1–5 toothlike lobes.

Peduncles

30–80 mm, glabrous or hirtellous.

Involucres

obconic, 5–7 mm.

Ray florets

10–21;

corollas yellow-orange, laminae 4–10 × 1.5–3 mm.

Disc florets

50–100+;

corollas yellow, 2.5–4.5 mm (peripheral ± zygomorphic in some plants).

Phyllaries

12–22, margins of outer distinct less than 1/5 their lengths, abaxial faces glabrous or sparsely hirtellous.

Calyculi

of 3–8 deltate to subulate bractlets, lengths less than 1/2 phyllaries.

Cypselae

2–3.5 mm;

pappi of erose and/or aristate scales 0.7–3.5 mm.

Pappi

of 10–12 unequal, aristate scales to 3 mm.

2n

= 16.

Thymophylla tenuiloba

Thymophylla tenuiloba var. wrightii

Phenology Flowering spring.
Habitat Sandy soils, coastal grasslands, roadways
Elevation 0–30 m (0–100 ft)
Distribution
from FNA
TX; n Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
TX
Discussion

Varieties 4 (4 in the flora).

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

Key
1. Leaf blades seldom lobed (linear to spatulate, usually entire, rarely with 3–5 toothlike lobes)
var. wrightii
1. Leaf blades lobed (lobes 7–15 linear)
→ 2
2. Pappi of 3–5-aristate scales
var. tenuiloba
2. Pappi of truncate to lanceolate and/or 1-aristate scales
→ 3
3. Pappi of 5 erose scales alternating with 5unequal, 1-aristate scales
var. treculii
3. Pappi of 5–10 lanceolate to muticous scales, all ± erose or 1–3, 1-aristate
var. texana
Source FNA vol. 21, p. 242. FNA vol. 21, p. 244.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Pectidinae > Thymophylla Asteraceae > tribe Heliantheae > subtribe Pectidinae > Thymophylla > Thymophylla tenuiloba
Sibling taxa
T. acerosa, T. aurea, T. concinna, T. micropoides, T. pentachaeta, T. setifolia, T. tephroleuca
T. tenuiloba var. tenuiloba, T. tenuiloba var. texana, T. tenuiloba var. treculii
Subordinate taxa
T. tenuiloba var. tenuiloba, T. tenuiloba var. texana, T. tenuiloba var. treculii, T. tenuiloba var. wrightii
Synonyms Hymenatherum tenuilobum, Dyssodia tenuiloba Hymenatherum wrightii, Dyssodia wrightii, Dyssodia tenuiloba var. wrightii
Name authority (de Candolle) Small: Fl. S.E. U.S., 1295, 1341. (1903) (A. Gray) Strother: Sida 11: 378. (1986)
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