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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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.


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.


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
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

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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