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.



Meredith A. Lane

Biennial to subshrub from taproot or woody caudex, glabrous to tomentose or glandular-sticky
Leaves entire to pinnately lobed, generally clasping, gland-dotted
Inflorescence: heads generally radiate, 1–many; involucres obconic to hemispheric, generally gummy; phyllaries in 4–10 series, bases generally tough, tips green; receptacle flat to convex, naked, ± pitted
Ray flowers 0–many; ligules yellow
Disk flowers: corollas yellow; style appendages linear to lanceolate, generally = or > stigmatic portion
Fruit cylindric or swollen-obconic, shiny white to ± brown, glabrous, smooth to ridged; pappus of 1–6 awns ± < disk corollas, generally < 0.2 mm wide, generally U-shaped in X -section, generally entire, deciduous
Species in genus: ± 80 species: c&w North America, South America
Etymology: (D.H. Grindel, 1776–1836, Latvian botanist)
Hybrids common.


G. squarrosa (Pursh) Dunal var. serrulata (Rydb.) Steyerm.

Biennial 1–6 dm, decumbent to erect, branched, white to yellowish, glabrous
Leaf 1.5–7 cm, oblong to ovate, dentate (teeth with rounded, swollen tips), gray-green, glabrous
Inflorescence: heads sometimes subtended by bracts; involucres 12–20 mm diam, bell-shaped; phyllaries 5–6 series, outer coiled 360°
Ray flowers 0 or 24–36; corollas 8–10 mm
Disk flowers generally > 120; corolla throat abruptly wider
Fruit 2.3–3 mm, light brown to yellowish, smooth to 2–3-ribbed; top truncate; pappus awns 2–3(6)
Chromosomes: 2n=12,24
Ecology: Disturbed roadsides, streamsides
Elevation: < 1000 m.
Bioregional distribution: Sierra Nevada (e slope), c Sacramento Valley, South Coast, East of Sierra Nevada, Mojave Desert
Distribution outside California: native from Wyoming to New Mexico
Flowering time: Jul–Sep
TOXIC: concentrates selenium.

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bioregional map for GRINDELIA%20squarrosa%20var.%20serrulata 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 Grindelia squarrosa var. serrulata
Retrieve dichotomous key for Grindelia
Retrieve multiple-entry key (MEKA) for Grindelia
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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