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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.
Annual 5–80 cm, often aromatic. Stem: ± erect. Leaf: basal and cauline, proximal opposite or in rosette, sometimes persistent, most alternate, sessile, 5–18+ cm, 2–8(12) mm wide, narrowly elliptic to linear or lance-linear, minutely serrate or entire, generally puberulent or coarse- to silky-hairy, distal often also stalked-glandular. Inflorescence: heads radiate, 1 or in ± panicle-, raceme-, or spike-like clusters or in tight groups; involucre hemispheric to ± urn-shaped or spheric, 3–8+ mm diam (rarely subtended by calyx-like set of 5–7 bractlets); phyllaries 5–14 in 1 series, linear to lanceolate or oblanceolate, each generally 1/2 enveloping a subtended ray ovary, falling with fruit, 3.5–12 mm, coarse- or soft-hairy, stalked-glandular; receptacle flat to conic, glabrous; paleae fused, forming cells around each disk flower, scarious, ± liquifying. Ray flower: 5–14; corolla white or yellow, ray 5–12 mm, often purple-veined abaxially. Disk flower: 5–60+, staminate; corolla 2.5–3.5 mm, white or yellow, tube < throat, lobes deltate; anthers ± dark purple, tips widely ovate to ovate-deltate; style glabrous proximal to branches, tips lanceolate to awl-shaped, densely hairy. Fruit: ray fruit 2–3.5 mm, nearly round in ×-section (except ± flattened adaxially) or ± 3- angled (abaxially generally ± widely 2-faced, adaxially ± flattened to slightly bulging), glabrous, black, tip sometimes beaked, beak inconspicuous, straight, diam > length, pappus 0; disk fruit 0, pappus 0.
2n=28. Self-sterile. [Online Interchange]
Unabridged disk flower: anther bases cordate-sagittate to sagittate.
1. Heads generally nearly sessile along well-developed side branches of flowering stems; ray white, purple-veined abaxially
2. Peduncle bracts and calyx-like bracts subtending head often much exceeding phyllaries; phyllaries 6–12 mm, tips generally > bodies; fruit width 0.5–0.6 × length ..... subsp. calyculata
2' Peduncle bracts not or barely exceeding phyllaries, calyx-like bracts subtending head 0; phyllaries 3–7 mm, tips generally < bodies; fruit width 0.6–0.75 × length ..... subsp. clevelandii
1' Heads generally terminating elongate side branches of flowering stems or ± sessile in tight groups; ray white or yellow, purple-veined abaxially or not
3. Leaves generally puberulent or minutely bristly or strigose and nonglandular, distal rarely long-soft-hairy and glandular; ray white, not purple-veined abaxially except North Coast; heads in panicle-like cluster ..... subsp. tracyi
3' Leaves short-hairy, ± shaggy, or silky-hairy, all or distal glandular; ray white or yellow, purple-veined abaxially; heads in panicle-like cluster or in tight groups
4. Leaves ± shaggy, hairs at margins often longer on distal leaves; some or all heads generally in tight groups, sometimes in flat-topped or panicle-like cluster; phyllaries 6–10 mm, tips generally > bodies; ray white ..... subsp. congesta
4' Leaves short-hairy, ± shaggy, or silky-hairy, hairs at margins not notably longer on distal leaves; heads in panicle-like cluster; phyllaries 3–7(8) mm, tips generally < bodies; ray white or yellow
5. Ray yellow ..... subsp. lutescens
5' Ray white ..... subsp. luzulifolia
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].
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