Jepson Flora Project: Jepson Interchange    

 
link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

    THIS PAGE IS NO LONGER UPDATED
    AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
  • Up-to-date information about California vascular plants is available from 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.

MALACOTHAMNUS

BUSH MALLOW

David M. Bates

Subshrubs, shrubs; hairs sparse to dense, stellate (stalked or sessile), simple, and glandular
Stem erect; branches sometimes spreading
Leaf: blade toothed, lobes 0 or 3–7
Inflorescence head-like to panicle-like, composed of axillary clusters (each a cyme) variously arrayed; clusters few–many-flowered, loose to dense, congested or well separated; bractlets subtending calyx 3
Flower: petals > calyx, generally pale pinkish purple or white (often purplish when dry); filament column included; stigmas head-like
Fruit disk-like; segments 7–14, 2–5 mm, separating, each dehiscing into 2 valves, unarmed, smooth, top hairy
Seed 1 per fruit segment
Species in genus: 11 species: CA, nw Mex
Etymology: (Greek: soft shrub)
Spp. represent major morphological variants; they are all interfertile and sometimes intergrade in areas of proximity. Variation between populations (especially in hairs, inflorescence, and flowers) is high and of ± complex pattern within most species

Native

M. aboriginum (B.L. Rob.) Greene

INDIAN VALLEY BUSH MALLOW

Plant 20–30 dm; hairs dense, generally tawny
Stem: branches ± stout
Leaf: blade < 6(–12) cm, ovate to ± round, lobes generally 3–5, sharply angled
Inflorescence spike- to panicle-like; clusters generally densely many-flowered, subtended by conspicuous bracts; bractlets 6–15 mm, (1)3–9 mm wide, narrowly elliptic to ± round
Flower: calyx 8–17 mm, angled or winged in bud, lobes 5–11 mm, ovate to ± round, acuminate
Chromosomes: 2n=34
Ecology: Open rocky slopes
Elevation: 150–1700 m.
Bioregional distribution: Inner South Coast Ranges (s San Benito, e Monterey, w Fresno cos.), Peninsular Ranges (Laguna Mtns, San Diego Co.).PR plants have narrow bractlets, appear to be this sp.
See the CNPS Inventory for information about endangerment and rarity.
previous taxon | next taxon
bioregional map for MALACOTHAMNUS%20aboriginum being generated
 


Retrieve Jepson Interchange Index to Plant Names entry for Malacothamnus aboriginum
Retrieve dichotomous key for Malacothamnus
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
Return to the Jepson Interchange main page
Return to treatment index page
Glossary


University & Jepson Herbaria Home Page |
General Information | University Herbarium | Jepson Herbarium |
Visiting the Herbaria | On-line Resources | Research |
Education | Related Sites
Copyright © by the Regents of the University of California