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.

MALVACEAE

MALLOW FAMILY

Steven R. Hill, except as specified

Annual, perennial herb, shrubs, trees, generally stellate-hairy; juice sticky; inner bark tough, fibrous
Leaves alternate, simple, petioled; blade generally palmately veined or lobed, stipules present
Inflorescence often leafy; whorl or involucre of bractlets often subtending calyx
Flower generally bisexual, radial; calyx lobes 5, margins abutting in bud; petals 5, free (fused at base to filament tube, so falling together); stamens many, filaments fused into a tube surrounding style, tube fused in turn to petal bases; pistil 1, ovary superior, chambers generally 5 or more, style branches, stigmas generally 1 or 2 X as many as chambers
Fruit of 5–many disk- or wedge-shaped segments, loculicidal capsule, or berry
Genera in family: 100 genera, 2000 species: worldwide, especially warm regions; some cultivated (e.g., Abelmoschus , okra; Alcea ; Gossypium , cotton; Hibiscus , Malvaviscus )
Recent taxonomic note: Recently treated to include Sterculiaceae [Angiosperm phylogeny Group 1998 Ann Missouri Bot Gard 85:531–553; Alverson et al. 1999 Amer J Bot 86:1474–1486; Bayer et al. 1999 Bot J Linn Soc 129:267–303]
Mature fruit important for identification.

SIDALCEA

CHECKER MALLOW, CHECKERBLOOM

Annual, perennial herb, sometimes from long, creeping rhizomes
Stem generally erect or base ± decumbent
Leaves generally mostly from near stem base; lowest blades generally crenate to shallowly lobed, upper blades generally deeply lobed (generally ± compound)
Inflorescence generally spike- or panicle-like, generally more open in fruit; bracts at pedicel base 2, generally stipule-like; bractlets subtending calyx generally 0(–3)
Flower: calyx lobes = or > tube; petals purple or rose-pink to white; stamen-tube with generally 2 series of ± fused filaments near tip; stigmas linear, on inner side of style branches
Fruit: segments generally 5–10, indehiscent, generally ± beaked, walls thin
Seed 1 per fruit segment
Species in genus: ± 25 species: w North America
Etymology: (Greek: combination of 2 names for mallow)
Reference: [Hitchcock 1957 Univ Wash Publ Biol 18:1–96]
Highly variable and difficult, with many local forms; some plants will not key with certainty. Additional work warranted.

Native

S. calycosa M.E. Jones

Annual or perennial herb from rhizome
Stem 3–9 dm, glabrous or sparsely hairy
Leaf: lowest blades generally crenate; upper blades nearly compound with 5–11 linear to oblanceolate divisions
Inflorescence dense; bracts simple or 2-lobed
Flower: calyx 4–12 mm, often purple-tinged or scarious, ± bristly, lobes narrowly ovate, acuminate; petals 12–25 mm, pale purple (rarely white); filaments in 2 distinct continuous series
Fruit: segment 2.5–4.5 mm, back longitudinally grooved, glabrous
Ecology: Marshes, wet places in woodlands or valleys
Elevation: < 1200 m.
Bioregional distribution: North Coast, Outer North Coast Ranges, Cascade Range Foothills, Sierra Nevada Foothills, Central Coast, n San Francisco Bay Area.

Native

subsp. rhizomata (Jeps.) Munz

Perennial from long rhizomes
Stem fleshy
Leaf: stipule 12–18 mm; blade 2.5–10 cm wide
Inflorescence: bracts 8–12 mm, silky-hairy
Flower: calyx 6–12 mm; petals 20–25 mm
Fruit: segment ± 4.5 mm, back strongly grooved, sides lightly net-veined
Ecology: Very uncommon. Marshes near coast
Elevation: < 30 m.
Bioregional distribution: c&s North Coast (Mendocino, Sonoma cos.), n Central Coast (Marin Co.).Easily distinguished by large, fused, ciliate bracts
Horticultural information: WET: 7, 14, 19, 20, 21, 22, 23 &SUN: 5, 15, 16, 17, 24; GRCVR.
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for SIDALCEA%20calycosa%20subsp.%20rhizomata 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 Sidalcea calycosa subsp. rhizomata
Retrieve dichotomous key for Sidalcea
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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