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Volume IV (1988) - Flora of New Zealand Naturalised Pteridophytes, Gymnosperms, Dicotyledons
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Achillea L.

ACHILLEA L.

Perennial herbs, often with stout woody rootstock. Lvs simple and entire to 3-4-pinnate or pinnatisect, alternate. Capitula in corymbs, or rarely solitary, terminal, usually pedunculate, rarely shortly so; involucral bracts in several rows, with membranous margins. Receptacle flat or convex; scales present. Outer florets ♀, ligulate, yellow, white or pink; inner florets ⚥; corolla tube compressed. Achenes all similar, compressed, glabrous, smooth, not or slightly winged at edges; pappus 0.

Key

1
Ligules pale to deep yellow
2
Ligules white, or pale to deep pink
3
2
Ligules deep yellow; mid-cauline lvs with mostly 10-15 pairs of primary segments
*filipendulina ζ
Ligules pale yellow; mid-cauline lvs with mostly 5-10 pairs of primary segments
*nobilis ζ
3
Lvs mostly 2-pinnate with segments again pinnatisect; ray florets 4-7 per capitulum
1. *millefolium
Lvs simple, finely serrate; ray florets 8-numerous per capitulum
2. *ptarmica

85 spp., Europe, S.W. and C. Asia, N. America. Naturalised spp. 4.

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