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bristleleaf pricklyleaf, Dahlburg-daisy, shooting star

pricklyleaf dogweed

Habit Annuals (rarely persisting), green, to 30 cm, glabrous or sparsely hirtellous. Subshrubs or shrubs, green, to 25 cm, usually puberulent, sometimes glabrescent, rarely glabrous.
Stems

decumbent to erect.

erect (branched from bases).

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).

mostly opposite;

blades not lobed, linear to acerose, 10–18 mm.

Peduncles

30–80 mm, glabrous or hirtellous.

0–10 mm, puberulent or glabrous.

Involucres

obconic, 5–7 mm.

campanulate to cylindric, 5–7 mm.

Ray florets

10–21;

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

7–8;

corollas lemon-yellow, laminae 5–6 × 2–3 mm.

Disc florets

50–100+;

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

18–25+;

corollas pale yellow, 3–4 mm.

Phyllaries

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

ca. 13, margins of outer distinct less than 1/6 their lengths, abaxial faces puberulent or glabrous.

Calyculi

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

of 5 lance-linear bractlets, lengths 1/2+ phyllaries.

Cypselae

2–3.5 mm;

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

3–3.5 mm;

pappi of ca. 20 scales (each a fascicle of 3–5 bristles), 3–4 mm.

2n

= 16, 24.

Thymophylla tenuiloba

Thymophylla acerosa

Phenology Flowering through the year, mostly summer–fall.
Habitat Calcareous outcrops, gypseous soils
Elevation 1000–2000+ m (3300–6600+ ft)
Distribution
from FNA
TX; n Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM; NV; TX; UT; Mexico
[WildflowerSearch map]
[BONAP county map]
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. 241.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Pectidinae > Thymophylla Asteraceae > tribe Heliantheae > subtribe Pectidinae > Thymophylla
Sibling taxa
T. acerosa, T. aurea, T. concinna, T. micropoides, T. pentachaeta, T. setifolia, T. tephroleuca
T. aurea, T. concinna, T. micropoides, T. pentachaeta, T. setifolia, T. tenuiloba, T. tephroleuca
Subordinate taxa
T. tenuiloba var. tenuiloba, T. tenuiloba var. texana, T. tenuiloba var. treculii, T. tenuiloba var. wrightii
Synonyms Hymenatherum tenuilobum, Dyssodia tenuiloba Dyssodia acerosa
Name authority (de Candolle) Small: Fl. S.E. U.S., 1295, 1341. (1903) (de Candolle) Strother: Sida 11: 376. (1986)
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