Columbia cut-leaf, fineleaf hymenopappus, white ragweed
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Columbia cut-leaf, fine-leaf hymenopappus
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Perennials, 5–10 cm. |
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30–100 cm. |
basal 2-pinnate, 3–20 cm, lobes 2–50 × 0.5–2(–3) mm; cauline 0–12. |
basal axils ± densely tomentose, terminal lobes 15–50 mm; cauline (0–)2–5. |
1–16 cm. |
1–15 cm. |
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15–45; corollas yellowish, 2.5–4.5 mm, throats 1.5–2.5 mm, lengths 3–5 times lobes; anthers 2.5–3 mm. |
0. |
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10–80; corollas usually yellowish, sometimes whitish, 2.2–7 mm, tubes 1–2.5 mm, throats campanulate, 1–3 mm, lengths 2–8 times lobes. |
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whitish to yellowish, 3–14 × 2–5 mm. |
6–10 mm. |
1–60 per stem. |
(2–)6–40. |
3–7 mm, ± hirtellous to villous; pappi of 12–22 scales 0.1–3 mm. |
4.5–6 mm, hairs 0.4–1 mm; pappi 0.2–1 mm. |
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= 34. |
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Flowering May–Sep. |
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Sands, clays, gravels |
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100–300+ m (300–1000+ ft) |
AZ; CA; CO; ID; KS; MT; ND; NE; NM; NV; OR; SD; TX; UT; WA; WY; AB; SK; n Mexico
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ID; OR; WA |
Varieties 13 (13 in the flora). Some plants are morphologically intermediate between some pairs of varieties of Hymenopappus filifolius as treated by B. L. Turner (1956). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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1. Axils of basal leaves glabrous or sparsely tomentose; cauline leaves 0 or 1(–2) | → 2 |
1. Axils of basal leaves ± densely tomentose; cauline leaves (0–)2–12 | → 3 |
2. Peduncles 1–2 cm; corollas 2–3 mm; anthers 2 mm; cypselae 3.5–4 mm | var. parvulus |
2. Peduncles 2–10 cm; corollas 3–5 mm; anthers 2.5–3 mm; cypselae 4–6 mm | var. nudipes |
3. Terminal lobes of basal leaves 2–6 mm; phyllaries 3–7 mm; florets 10–30; corollas 2–3 mm | → 4 |
3. Terminal lobes of basal leaves (2–)3–50 mm; phyllaries (5–)6–14 mm; florets (15–)20–70+; corollas (2.5–)3–7 mm. | → 5 |
4. Plants 5–20 cm; cauline leaves 0–3; pappi 0.1–0.8 mm | var. luteus |
4. Plants 20–35 cm; cauline leaves 4–9; pappi 0.5–1.5 mm | var. pauciflorus |
5. Corollas 4–7 mm, throat lengths (2–)3–8 times lobes; anthers 3–4 mm; cypselae 5–7 mm; pappi (1.2–)1.5–3 mm | → 6 |
5. Corollas 2.5–4.5 mm, throat lengths 2–4(–5) times lobes; anthers 2–3 mm; cypselae 4–6 mm; pappi 0.2–2(–3) mm | → 8 |
6. Peduncles 8–16 cm; corollas whitish; cypselahairs 0.5–1 mm | var. eriopodus |
6. Peduncles 2–12 cm; corollas yellowish; cypsela hairs 1–2 mm | → 7 |
7. Cauline leaves (1–)2–6; terminal lobes of basal leaves 5–30 mm; phyllaries 8–12(–14)mm | var. megacephalus |
7. Cauline leaves 0–3; terminal lobes of basal leaves 3–15 mm; phyllaries 6–10 mm | var. lugens |
8. Cauline leaves (2–)3–8; heads 5–60; corolla throats 1.3–1.8 mm | var. polycephalus |
8. Cauline leaves 0–5(–12); heads 1–10(–40); corolla throats 1.5–2.5 mm | → 9 |
9. Terminal lobes of basal leaves 3–6 mm; caul-ine leaves 5–12 | var. tomentosus |
9. Terminal lobes of basal leaves 2–50 mm; cauline leaves 0–5 | → 10 |
10. Plants 30–100 cm; terminal lobes of basal leaves 15–50 mm; pappi 0.2–1 mm | var. filifolius |
10. Plants 5–50 cm; terminal lobes of basal leaves 2–30 mm; pappi (0.6–)1–3 mm | → 11 |
11. Peduncles 3–15 cm; cypsela hairs 0.1–1 mm; pappi 1.5–3 mm | var. nanus |
11. Peduncles 1–6 cm; cypsela hairs 1–3 mm; pappi 0.6–2 mm | → 12 |
12. Cauline leaves 0–2; cypsela hairs 1 mm; pappi 0.6–1.3 mm | var. idahoensis. |
12. Cauline leaves (0–)2–4; cypsela hairs 1–3 mm; pappi 1.5–2 mm | H. filifolius |
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FNA vol. 21, p. 311. |
FNA vol. 21, p. 314. |
Asteraceae > tribe Heliantheae > subtribe Hymenopappinae > Hymenopappus |
Asteraceae > tribe Heliantheae > subtribe Hymenopappinae > Hymenopappus > Hymenopappus filifolius |
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H. filifolius var. cinereus, H. filifolius var. eriopodus, H. filifolius var. idahoensis, H. filifolius var. lugens, H. filifolius var. luteus, H. filifolius var. megacephalus, H. filifolius var. nanus, H. filifolius var. nudipes, H. filifolius var. parvulus, H. filifolius var. pauciflorus, H. filifolius var. polycephalus, H. filifolius var. tomentosus |
H. filifolius, H. filifolius var. eriopodus, H. filifolius var. filifolius, H. filifolius var. idahoensis., H. filifolius var. lugens, H. filifolius var. luteus, H. filifolius var. megacephalus, H. filifolius var. nanus, H. filifolius var. nudipes, H. filifolius var. parvulus, H. filifolius var. pauciflorus, H. filifolius var. polycephalus, H. filifolius var. tomentosus |
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Hooker: Fl. Bor.-Amer. 1: 317. (1833) |
unknown |
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