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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

ARCTOTHECA

Alison M. Mahoney & Robert J. McKenzie


Annual or perennial herb, ± glandular and/or with segmented hairs. Stem: 0, or prostrate and creeping with adventitious roots at nodes, or shortly decumbent to erect, ribbed, white-cobwebby. Leaf: alternate, basal in rosettes and/or cauline, petioled, (2)5–20(30+) cm, (1)2–5(7) cm wide, [ovate] obovate to spoon-shaped, ± deeply pinnately lobed, ultimate margin ± dentate-prickly [entire or shallowly toothed] or distal ± entire, adaxially finely cobwebby [densely woolly], abaxially densely white-woolly. Inflorescence: heads radiate, 1, peduncled; phyllaries graduated in 3–6 series, proximal narrowed to spreading or reflexed, awn-like, tips fringed, distal with expanded membranous tips; receptacle flat, ± pitted, pit margins with short, membranous scales, epaleate. Ray flower: sterile; ray adaxially yellow throughout or with ± deeper yellow proximal band (dried rays yellow or proximally ± white with distal blue margin and distally blue to ± brown-purple), abaxially yellow to ± blue, red, or purple; style 0. Disk flower: corolla yellow throughout, or distally ± green to ± black; anther tip ovate-triangular; style tip proximally slender, thickened distal to a minutely hairy node, branches minute. Fruit: obovoid-elliptic, compressed, 4–5-ribbed, faces roughened, woolly to ± glabrous, occasionally with proximal cluster of segmented hairs; pappus of [2–3] 6–10 scales < fruit, crown-like, or 0.
5 species: native southern Africa. (Greek: bear-capsule, probably for woolly fruit) [Mahoney 2006 FNANM 19:197]
Unabridged references: [McKenzie et al. 2005 Ann Missouri Bot Gard 92:569–594]

Key to Arctotheca

1. Annual from rosette, initially stemless, later stems short-decumbent to ± erect, branched in age, rarely rooting at stem bases; ray 6–15(22) mm; disk corolla proximally yellow, distally ± green to black ..... A. calendula

1' Perennial herb from rosette, initially stemless, later spreading by creeping stems, rooting at nodes, forming new rosettes; ray (20)25–40 mm; disk corolla yellow throughout ..... A. prostrata

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Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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