Show Lower Taxa
Difference between revisions of "Chaenactis sect. Acarphaea"
Proc. Amer. Acad. Arts 10: 74. 1874.
Basionym: Undefined sect. Acarphaea Harvey & A. Gray Mem. Amer. Acad. Arts, n. s. 4: 98. 1849
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name=Chaenactis sect. Acarphaea | name=Chaenactis sect. Acarphaea | ||
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|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Chaenactidinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Chaenactidinae | ||
Latest revision as of 21:07, 5 November 2020
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.
Distribution
sw United States, nw Mexico.
Discussion
Species 3 (2 in the flora).
Selected References
None.
Lower Taxa
Key
| 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 | Chaenactis carphoclinia |
| 1 | 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 | > 2 |
| 2 | 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 | Chaenactis artemisiifolia |
| 2 | 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 | Chaenactis lacera (see 1 Chaenactis artemisiifolia) |