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bristleleaf pricklyleaf, Dahlburg-daisy, shooting star

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).

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.

Thymophylla tenuiloba

Discussion

Varieties 4 (4 in the flora).

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

Distribution
from FNA
TX; n Mexico
[WildflowerSearch map]
[BONAP county map]
Parent taxa Asteraceae > tribe Heliantheae > subtribe Pectidinae > Thymophylla
Sibling taxa
T. acerosa, T. aurea, T. concinna, T. micropoides, T. pentachaeta, T. setifolia, T. tephroleuca
Subordinate taxa
T. tenuiloba var. tenuiloba, T. tenuiloba var. texana, T. tenuiloba var. treculii, T. tenuiloba var. wrightii
Key
1.Leaf blades seldom lobed (linear to spatulate, usually entire, rarely with 3–5 toothlike lobes)T. tenuiloba var. wrightii
1.Leaf blades lobed (lobes 7–15 linear)→ 2
2.Pappi of 3–5-aristate scalesT. tenuiloba 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 scalesT. tenuiloba var. treculii
3.Pappi of 5–10 lanceolate to muticous scales, all ± erose or 1–3, 1-aristateT. tenuiloba var. texana
Synonyms Hymenatherum tenuilobum, Dyssodia tenuiloba
Name authority (de Candolle) Small: Fl. S.E. U.S., 1295, 1341. (1903)
Source Flora of North America vol. 21, p. 242.
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