Show Lower Taxa
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
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 glanddotted. 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) |
... more about "Chaenactis sect. Acarphaea"
introrse +
connate +
herbaceous +
scarious +
absent +
hirsute +
papillate +
continuous +
decurrent +
elliptic +
lobed;ovate;oblanceolate;ovate;oblanceolate;linear;deltate +
winged;ribbed;winged;ribbed +
1;15 +
distal +
stigmatic +
6;80 +
absent +
actinomorphic +
equal +
monomorphic +
dimorphic +
staminate +
straight +
scabrous +
scabrellous +
distinct +
proximal +
1;5 +
bisexual +
dispersed +
singly +
discoid +
indeterminate +
surrounding +
hemispheric;obconic or broadly cylindric +
petiolate +
alternate +
2-carpellate +
inferior +
attached +
anatropous +
persistent +
fragile +
falling +
absent +
coroniform +
tough +
thick +
absent +
connate +
persistent +
distinct +
falling +
unequal +
Proc. Amer. Acad. Arts +
1874 +
pistillate +
absent +
fertile +
epaleate +
pitted +
knobby;convex;more or less flat +
fibrous +
distinct +
exalbuminous +
modifed +
absent +
alternate +
branched +
erect +
2-branched +
papillate +
Chaenactis sect. Acarphaea +
Chaenactis +
section +
cylindric +
shorter +
longer +
annual +
subshrub +