Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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ASTERACEAE

SUNFLOWER FAMILY

David J. Keil, Family Editor and author, except as specified

Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1–many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1–many per head
Flowers bisexual, unisexual, or sterile, ± small, of several types; calyx 0 or modified into pappus of bristles, scales, or awns, which is generally persistent in fruit; corolla radial or bilateral (rarely 0), lobes generally (0)4–5; stamens 4–5, anthers generally fused into cylinder around style, often appendaged at tips, bases, or both, filaments generally free, generally attached to corolla near throat; pistil 1, ovary inferior, 1-chambered, 1-seeded, style 1, branches 2, generally hair-tufted at tip, stigmas 2, generally on inside of style branches
Fruit: achene, cylindric to ovoid, generally deciduous with pappus attached
Genera in family: ± 1300 genera, 21,000 species (largest family of dicots): worldwide. Largest family in CA. Also see tribal key to CA genera: Strother 1997 Madroño 44(1):1–28. See glossary p. 25 for illustrations of general family characteristics.

HOLOCARPHA

Annual, densely glandular, strongly scented
Leaves alternate or lower opposite, linear to oblanceolate, entire to lobed; upper reduced, often with axillary leaf clusters, tipped by open-pit glands
Inflorescence: heads radiate, in flat-topped to panicle-like clusters; phyllaries half-enclosing ray ovaries, falling with fruits, back with stalked, open-pit glands, tip cylindric, gland-tipped; receptacle chaffy
Ray flowers 3–16; ligules 3-lobed (middle narrowest), yellow
Disk flowers few–many, most sterile; corolla yellow; anther tips widely triangular; style branches tapered
Fruit: pappus 0; ray achenes ± 3-angled, short-beaked, dark; disk achenes ± club-shaped
Species in genus: 4 species: CA
Etymology: (Greek: wholly chaffy, from receptacle)
Reference: [Palmer 1982 PhD Univ CA Davis]
± identical forms often intersterile.

Native

H. obconica (J.C. Clausen & D.D. Keck) D.D. Keck


Stems 1–12 dm; branches stiffly ascending, overtopping main stem, bristly below, glabrous or puberulent above, resinous
Leaves: lower 6–15 cm, linear, bristly, resinous; upper well spaced
Inflorescence open, ± flat-topped; peduncle bracts 1–3 mm, overlapping, ascending to spreading, ± cylindric, generally gland-tipped; involucres 4–5 mm, ± obconic; phyllaries with 5–20 stout, gland-tipped projections, glabrous or minutely glandular; receptacle 2–2.5 mm diam, flat or rounded
Ray flowers 4–9; ligules 4–6 mm
Disk flowers 11–21; corollas 2.5–4 mm; anthers yellow
Fruit: ray achenes 2.5–3.5 mm
Chromosomes: 2n=12
Ecology: Grassland
Elevation: < 500 m.
Bioregional distribution: s Sierra Nevada Foothills, nw San Joaquin Valley, ne Central Western California.Highly variable; densely leafy, late-flowering plants from nw SnJV, e SnFrB have been called subsp. autumnalis D.D. Keck.
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bioregional map for HOLOCARPHA%20obconica being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Holocarpha obconica
Retrieve dichotomous key for Holocarpha
Retrieve multiple-entry key (MEKA) for Holocarpha
Overlay Consortium of California Herbaria specimen data by county on this map
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