Hymenopappus
hymenopappus, woolly-whites
erect, often scapiform (1 stem per crown in biennials, usually 3+ in perennials).
mostly basal or basal and cauline; alternate;
petiolate;
blades usually 1–2+ times pinnately lobed (lobes usually ± filiform), ultimate margins usually entire, rarely toothed, faces glabrous or hairy, often tomentose, usually gland-dotted as well.
obconic to hemispheric, 4–15+ mm diam.
flat or convex, epaleate (except H. newberryi).
0 or 8, pistillate, fertile;
corollas white to ochroleucous.
12–70+, bisexual, fertile;
corollas usually yellow to ochroleucous or whitish to purplish, tubes longer than or about equaling funnelform or abruptly dilated, campanulate throats, lobes 5 (reflexed at anthesis).
5–13+ in 2–3+ series, subequal, usually membranous- or scarious-margined (often yellowish, whitish, or purplish).
radiate or discoid, in ± corymbiform arrays.
obpyramidal (4-, sometimes 5-angled, each face usually 1–4-ribbed, glabrous or hirtellous to villous);
pappi 0 or of 12–22 orbiculate to spatulate scales.
= 17.
Hymenopappus
Species 11 (10 in the flora).
My treatment of Hymenopappus is essentially an adaptation of that by B. L. Turner (1956).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Perennials (usually 3+ aerial stems from crown); cauline leaves mostly 0–12; heads 1–20(–50) per stem; disc corolla throat lengths 2–8 times lobes | → 2 |
1. Biennials (usually 1 stem from crown); cauline leaves (2–)10–100; heads (15–)20–200 per stem; disc corolla throat lengths 1–2(–3) times lobes | → 5 |
2. Ray florets 8 | → 3 |
2. Ray florets 0 | → 4 |
3. Basal leaves 12–25 cm; peduncles 6–15 cm; pappi 0, or 0.01–0.1 mm (receptacles paleate) | H. newberryi |
3. Basal leaves 8–14 cm; peduncles 3–8 cm; pappi 0.4–0.6 mm | H. radiatus |
4. Leaf blades simple or 1-pinnate; cypselae glabrous or sparsely hirtellous | H. mexicanus |
4. Leaf blades 2-pinnate; cypselae hirtellous to villous | H. filifolius |
5. Ray florets 8 | H. biennis |
5. Ray florets 0 | → 6 |
6. Basal leaves simple or 1–2-pinnate, lobes (1–)5–30 mm wide; disc corollas whitish or purplish (not yellowish), tubes 2–3 mm | → 7 |
6. Basal leaves 2-pinnate, lobes 0.5–6 mm wide; disc corollas whitish or yellowish, tubes 1.5–2.2 mm | → 8 |
7. Basal leaves simple or 1-pinnate; disc corollas usually purplish, rarely whitish; pappi 0.3–2 mm | H. artemisiifolius |
7. Basal leaves 1–2-pinnate; disc corollas whitish; pappi 0.1–1 mm | H. scabiosaeus |
8. Lobes of basal leaves 1–6 mm wide; disc corollas yellowish; pappi 0.5–1.5 mm | H. flavescens |
8. Lobes of basal leaves 0.5–1.5 mm wide; disc corollas whitish; pappi 1–1.5(–2) mm | → 9 |
9. Disc corollas 3–4 mm, throats ± funnelform | H. carrizoanus |
9. Disc corollas 2.5–3 mm, throats ± campanulate | H. tenuifolius |
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WA
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