|University of California, Berkeley|
|Directory News Site Map Home|
Key to families | Table of families and genera
This text currently parallels The Jepson Manual: Vascular Plants of California, Second Edition that is now available at the University of California Press.
Text appearing in blue on this page will not appear in the printed book; it will be displayed only on the Web. 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.
Annual 5–60 cm.
Leaf: basal and cauline, proximal opposite, often crowded, distal alternate, sessile, spoon-shaped to linear, entire or toothed, coarse-hairy to strigose, distal sometimes also stalked- glandular.
Inflorescence: heads radiate, in ± umbel-like clusters; involucre 3–5 mm diam, ± obconic or urn-shaped to spheric; phyllaries 2–12 in 1 series, lanceolate (often long- tapered), each generally wholly enveloping a ray ovary, falling with fruit, coarse-hairy, hair tips ± hooked; receptacle flat to convex, glabrous or minutely bristly; paleae in 1 series between ray and disk flowers, fused, phyllary-like to ± scarious, deciduous.
Ray flower: 2–12; corolla yellow, ray sometimes purple-veined abaxially.
Disk flower: 1–65, staminate; corolla yellow, tube < throat, lobes deltate; anthers ± dark purple, tips ovate- deltate; style glabrous proximal to branches, tips narrowly lance-awl-shaped, densely hairy.
Fruit: ray fruit compressed, club-shaped, arched, glabrous, tip beaked, pappus crown-like, scales 0.1–1 mm; disk pappus of 5–7 scales, 2.5–3 mm, white or purple-tipped, awl-shaped, wavy, minutely ciliate.
2 species: CA. (Jens C. Clausen, CA botanist, 1891–1969) [Baldwin & Strother 2006 FNANM 21:301–302]
Unabridged disk flower: anther bases ± cordate.
Unabridged references: [Carlquist 2003 Tarweeds and silverswords: evolution of the Madiinae (Asteraceae)]
1. Involucre urn-shaped or spheric; ray flowers 5–12, ray 4–10 mm; disk flowers 16–65; plants 6–60 cm ..... J. rammii
1' Involucre broadly obconic; ray flowers 2–8, ray 0.5–3 mm; disk flowers 1–7; plants 5–15(25) cm ..... J. yosemitana
Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
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].
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.