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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.

HEMIZONIA

TARPLANT, TARWEED

Annual to shrub, generally glandular, aromatic
Stems generally branched above middle or throughout
Leaves generally cauline (some also basal and cauline), generally alternate, generally linear to (ob)lanceolate, entire to pinnately lobed, generally not spine-tipped; lower generally toothed to lobed; upper generally entire
Inflorescence: heads radiate, generally 1–many in open cymes; involucre generally hemispheric; phyllaries generally linear to lanceolate, half-enclosing ray fruits; chaff scales generally in 1 ring between ray and disk flowers (scattered)
Ray flowers 3–many; ligules generally 3-lobed, white to yellow
Disk flowers 3–many, staminate or fruiting; corollas white to yellow, becoming red; anther tips ovate; style branches long, tips bristly
Fruit: ray achenes ± 3-angled; pappus 0; disk achenes cylindric or obconic, pappus 0 or scales generally linear to lanceolate
Species in genus: ± 25 species: CA, OR, w AZ, n Baja CA
Etymology: (Greek: half girdle, from sheathing phyllaries)
Reference: [Tanowitz 1982 Syst Bot 7:314–339; Venkatesh 1958 Amer J Bot 45:77–84]
Recent taxonomic note: *See revised taxonomy of Baldwin 1999 Novon 9:462–471.

Native

H. conjugens D.D. Keck

OTAY TARPLANT

Annual 1–4 dm, short-bristly below, glandular above
Stems branched ± above middle
Leaves: lower 2–4.5 cm, oblanceolate, lobed; middle entire to toothed; upper appressed to pedicels
Inflorescence: heads 1–many in dense clusters, subsessile to short-peduncled; involucre 5–7.5 mm; phyllaries with flat, sessile glands
Ray flowers 8–10; ligules 3–6 mm, yellow
Disk flowers 13–21, fertile or staminate; corollas yellow; anthers black
Fruit 2.5–3 mm, beaked; disk pappus scales 6–9, white
Chromosomes: 2n=24
Ecology: Clay soil, coastal scrub
Elevation: < 300 m.
Bioregional distribution: s Peninsular Ranges (s San Diego Co.)
Distribution outside California: n Baja California
Threatened by development
Recent taxonomic note: *Deinandra conjugens (D.D. Keck) B.G. Baldwin

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bioregional map for HEMIZONIA%20conjugens being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Hemizonia conjugens
Retrieve dichotomous key for Hemizonia
Retrieve multiple-entry key (MEKA) for Deinandra
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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