Malacothamnus arcuatus
Common Name: arcuate bush-mallow
Family: Malvaceae
Element Code: PDMAL0Q0E0
Full Name: Malacothamnus arcuatus (Greene) Greene

Biology Glossary
Rarity Status Glossary
Occurrence Data from DFG
California Natural Diversity Database Glossary
  • Total # of Known Element Occurrences: 30
  • Element Occurrence Ranks:
    A B C D X U
    2 2 5 2 2 17
  • Population Status:
    >20 yrs
    <=20 yrs
    16 14
  • Presence:
    Present Extant Possibly Extirpated Extirpated
    28 1 1
Notes Glossary
  • Threatened by alteration of fire regimes. A synonym of M. fasciculatus in The Jepson Manual. See Manual of the Botany of the Region of San Francisco Bay, p. 66 (1894) by E. Greene for original description, Leaflets of Botanical Observation and Criticism 1:208 (1906) for revised nomenclature, and Leaflets of Western Botany 6(6):132-133 (1951) for taxonomic treatment.
  • To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page.
  • Date Added: 1974-01-01
  • Last Update: 2010-03-15
Location Glossary
  • Elevation: 15 - 355 meters
  • California Endemic: yes
  • States: California
  • California Counties and Islands:   name (code)
    Santa Clara (SCL),  Santa Cruz (SCR),  San Mateo (SMT)
  • Quads:   name (DWR code) USGS code
    Pacheco Pass (404C) 37121A2,  Pacheco Peak (405D) 37121A3,  Morgan Hill (406B) 37121B6,  Mt. Madonna (406C) 37121A6,  Santa Teresa Hills (407A) 37121B7,  Los Gatos (407B) 37121B8,  Laurel (407C) 37121A8,  Loma Prieta (407D) 37121A7,  Big Basin (408B) 37122B2,  Calaveras Reservoir (427A) 37121D7,  Milpitas (427B) 37121D8,  Palo Alto (428B) 37122D2,  Mindego Hill (428C) 37122C2,  Cupertino (428D) 37122C1,  Woodside (429A) 37122D3,  La Honda (429D) 37122C3,  San Francisco South (448B) 37122F4,  Montara Mountain (448C) 37122E4,  San Mateo (448D) 37122E3
  • Notes:
      Definitions of codes preceding a county and/or quad:
      * Presumed extirpated
      ? Uncertain about distribution or identity
      ?* Uncertain about distribution, but presumed extirpated if once present
      (?) Occurrence confirmed, but possibly extirpated
      Species may be present in other areas where conditions are favorable.
Presumed Extant Presumed Extirpated or Unknown 1060
Links to Leading Resources of Taxon Information
Suggested Citation
CNPS, Rare Plant Program. . Inventory of Rare and Endangered Plants (online edition, v8-02). California Native Plant Society, Sacramento, CA. Website [accessed ].

37121A2=Pacheco Pass (404C) 37121A2;37121A3=Pacheco Peak (405D) 37121A3;37121B6=Morgan Hill (406B) 37121B6;37121A6=Mt. Madonna (406C) 37121A6;37121B7=Santa Teresa Hills (407A) 37121B7;37121B8=Los Gatos (407B) 37121B8;37121A8=Laurel (407C) 37121A8;37121A7=Loma Prieta (407D) 37121A7;37122B2=Big Basin (408B) 37122B2;37121D7=Calaveras Reservoir (427A) 37121D7;37121D8=Milpitas (427B) 37121D8;37122D2=Palo Alto (428B) 37122D2;37122C2=Mindego Hill (428C) 37122C2;37122C1=Cupertino (428D) 37122C1;37122D3=Woodside (429A) 37122D3;37122C3=La Honda (429D) 37122C3;37122F4=San Francisco South (448B) 37122F4;37122E4=Montara Mountain (448C) 37122E4;37122E3=San Mateo (448D) 37122E3