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FNA | Family List | FNA Vol. 21 | Asteraceae | Hymenopappus

4. Hymenopappus filifolius Hooker, Fl. Bor.-Amer. 1: 317. 1833.

Perennials, 5–10 cm. Leaves: basal 2-pinnate, 3–20 cm, lobes 2–50 × 0.5–2(–3) mm; cauline 0–12. Heads 1–60 per stem. Peduncles 1–16 cm. Phyllaries whitish to yellowish, 3–14 × 2–5 mm. Ray florets 0. Disc florets 10–80; cor-ollas usually yellowish, sometimes whitish, 2.2–7 mm, tubes 1–2.5 mm, throats campanulate, 1–3 mm, lengths 2–8 times lobes. Cypselae 3–7 mm, ± hirtellous to villous; pappi of 12–22 scales 0.1–3 mm.

Varieties 13 (13 in the flora): North America, n Mexico.

Some plants are morphologically intermediate between some pairs of varieties of Hymenopappus filifolius as treated by B. L. Turner (1956).


1 Axils of basal leaves glabrous or sparsely to­men­­tose; cauline leaves 0 or 1(–2)   (2)
+ Axils of basal leaves ± densely tomentose; cauline leaves (0–)2–12   (3)
       
2 (1) Peduncles 1–2 cm; corollas 2–3 mm; anthers 2 mm; cypselae 3.5–4 mm   4a Hymenopappus filifolius var. parvulus
+ Peduncles 2–10 cm; corollas 3–5 mm; anthers 2.5–3 mm; cypselae 4–6 mm   4b Hymenopappus filifolius var. nudipes
       
3 (1) Terminal lobes of basal leaves 2–6 mm; phyllaries 3–7 mm; florets 10–30; corollas 2–3 mm   (4)
+ 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 (3) Plants 5–20 cm; cauline leaves 0–3; pappi 0.1–0.8 mm   4c Hymenopappus filifolius var. luteus
+ Plants 20–35 cm; cauline leaves 4–9; pappi 0.5–1.5 mm   4d Hymenopappus filifolius var. pauciflorus
       
5 (3) 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)
+ 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 (5) Peduncles 8–16 cm; corollas whitish; cypselahairs 0.5–1 mm   4e Hymenopappus filifolius var. eriopodus
+ Peduncles 2–12 cm; corollas yellowish; cypsela hairs 1–2 mm   (7)
       
7 (6) Cauline leaves (1–)2–6; terminal lobes of basal leaves 5–30 mm; phyllaries 8–12(–14)mm   4f Hymenopappus filifolius var. megacephalus
+ Cauline leaves 0–3; terminal lobes of basal leaves 3–15 mm; phyllaries 6–10 mm   4g Hymenopappus filifolius var. lugens
       
8 (5) Cauline leaves (2–)3–8; heads 5–60; corolla throats 1.3–1.8 mm   4h Hymenopappus filifolius var. polycephalus
+ Cauline leaves 0–5(–12); heads 1–10(–40); corolla throats 1.5–2.5 mm   (9)
       
9 (8) Terminal lobes of basal leaves 3–6 mm; caul-ine leaves 5–12   4i Hymenopappus filifolius var. tomentosus
+ Terminal lobes of basal leaves 2–50 mm; cauline leaves 0–5   (10)
       
10 (9) Plants 30–100 cm; terminal lobes of basal leaves 15–50 mm; pappi 0.2–1 mm   4j Hymenopappus filifolius var. filifolius
+ Plants 5–50 cm; terminal lobes of basal leaves 2–30 mm; pappi (0.6–)1–3 mm   (11)
       
11 (10) Peduncles 3–15 cm; cypsela hairs 0.1–1 mm; pappi 1.5–3 mm   4k Hymenopappus filifolius var. nanus
+ Peduncles 1–6 cm; cypsela hairs 1–3 mm; pappi 0.6–2 mm   (12)
       
12 (11) Cauline leaves 0–2; cypsela hairs 1 mm; pappi 0.6–1.3 mm   4l Hymenopappus filifolius var. idahoensis.
+ Cauline leaves (0–)2–4; cypsela hairs 1–3 mm; pappi 1.5–2 mm   4m Hymenopappus filifolius


 

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