Flora of North America species comparison

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Hymenopappus filifolius

Columbia cut-leaf, fineleaf hymenopappus, white ragweed
Habit Perennials, 5–10 cm.
Leaves

basal 2-pinnate, 3–20 cm, lobes 2–50 × 0.5–2(–3) mm;

cauline 0–12.
Peduncles

1–16 cm.
Ray florets

0.
Disc florets

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.
Phyllaries

whitish to yellowish, 3–14 × 2–5 mm.
Heads

1–60 per stem.
Cypselae

3–7 mm, ± hirtellous to villous;

pappi of 12–22 scales 0.1–3 mm.

Hymenopappus filifolius
Distribution
from FNA
AZ; CA; CO; ID; KS; MT; ND; NE; NM; NV; OR; SD; TX; UT; WA; WY; AB; SK; n Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

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.)
Key
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
Source FNA vol. 21, p. 311.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Hymenopappinae > Hymenopappus
Sibling taxa
H. artemisiifolius, H. biennis, H. carrizoanus, H. flavescens, H. mexicanus, H. newberryi, H. radiatus, H. scabiosaeus, H. tenuifolius
Subordinate taxa
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
Name authority Hooker: Fl. Bor.-Amer. 1: 317. (1833)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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