Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora.



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.


Robert L. Carr and Gerald D. Carr

Annual, generally erect, with tack- or saucer-shaped glands (and generally more normal glandular hairs), generally aromatic
Leaves generally alternate, ± sessile, ± linear, entire, generally reduced upward; lower often deciduous by flower
Inflorescence: heads radiate, variously clustered; peduncle bracts generally with 1+ tack-like glands; each phyllary partly enfolding a ray fruit; chaff scales between ray and disk flowers, fused, forming a cup, or ± free
Ray flowers 1–6; ligules 3–13 mm, 3-lobed, white to rose or yellow, sometimes with red spot near base
Disk flowers 1–many; corollas 2–9 mm, colored ± like ligules
Fruit: ray fruit ± 3-angled, inner surface ± flat, outer surface rounded to ± angled, pappus 0; disk fruit angled, base tapered, pappus 0 or generally of ± lanceolate (and sometime wider) scales
Species in genus: ± 9 species: especially CA (OR, NV)
Etymology: (Greek: cup gland)


C. truncata DC.


Stem 2–12 dm, generally reddish, generally glabrous to ± scabrous above; branches 0–many above middle
Leaves: lower 2–10 cm
Inflorescence: heads generally 1(few) per node; peduncle bracts 2–12 mm, tack-like gland 1; phyllaries and chaff scales 5–10 mm, outer surfaces glabrous or sparsely stiff-appressed- or long-straight-hairy, especially above, tack-like glands generally 0
Ray flowers 3–6; ligules yellow, lobes variable
Disk flowers 3–25; anthers sometimes purple
Fruit: ray fruit rough-wrinkled, glabrous; disk pappus scales 0 or 7–12, short, often blunt, toothed
Chromosomes: 2n=14
Ecology: Common. Dry, open hillsides, rocky ridges, talus
Elevation: < 1500 m.
Bioregional distribution: Northwestern California, Cascade Range, Sierra Nevada Foothills, Great Central Valley, Central Western California
Distribution outside California: Oregon
Synonyms: subspp. microcephala D.D. Keck and scabrella (Drew) D.D. Keck

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bioregional map for CALYCADENIA%20truncata 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 Calycadenia truncata
Retrieve dichotomous key for Calycadenia
Retrieve multiple-entry key (MEKA) for Calycadenia
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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