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378a. Chaenactis de Candolle sect. Acarphaea (Harvey & A. Gray) A. Gray, Proc. Amer. Acad. Arts. 10: 74. 1874.
Acarphaea Harvey & A. Gray, Mem. Amer. Acad. Arts, n. s. 4: 98. 1849
Annuals; proximal indument predominantly ± farinose, not arachnoid. Stems usually 1, erect; branches mainly distal. Leaves: largest blades deltate to ± ovate [broadly elliptic], (2–)3–4-pinnately lobed, not gland-dotted. Heads discoid (mostly 3–20+ per stem). Peduncles ascending to erect. Phyllaries: outer acute to acuminate-aristate. Florets: corollas white to pinkish, actinomorphic, ± equal. Cypselae ± terete or compressed; pappi 0, coroniform (of ± 10 scales), or of 4(–5) [10–16] scales in 1 [2–3] series. x = 8.
Species 3 (2 in the flora): sw United States, nw Mexico.
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| 1 |
Phyllaries: apices (all or inner) usually reddish, acuminate, aristate, terete; receptacles: paleae (0–)3–10+ (± phyllary-like, apices visible among mature floret buds); leaves: ultimate lobes ± terete; cypselae ± terete; involucres mostly 5–10 mm diam |
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2 Chaenactis carphoclinia |
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Phyllaries: apices (all) ± green, acute or scarcely acuminate, not aristate, ± plane; receptacles: paleae 0; leaves: ultimate lobes plane or involute; cypselae compressed; involucres mostly 10–25 mm diam |
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(2) |
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| 2 (1) |
Pappi 0 or coroniform (of ± 10 scales, longest 0.1–0.5 mm); involucres mostly 10–15 mm diam.; phyllaries ± densely villous, not or sparsely glandular |
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1 Chaenactis artemisiifolia |
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Pappi of 10–16 scales in 2–3 subequal series, longest scales 4–6 mm; involucres mostly 20–25 mm diam.; phyllaries ± glandular, not or sparsely villous |
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1 [Chaenactis lacera, see 1. C. artemisiifolia] |
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Lower Taxa
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