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Notes on Manzanitas (Arctostaphylos) in the Fort Ord region
 
Compiled by Fred Watson, PhD
Copyright (C) F. Watson

• Taxa
  
  • Burl-forming
    • Stomata generally on lower surfaces
      • Persistent shreddy bark
        A. tomentosa
        
        • Glandular hairs on twigs
          ssp. bracteosa
          Monterey shaggy-barked manzanita / Glandular woolyleaf manzanita
          (syn. ssp. trichoclada / "form" trichoclada in older FO docs)
          Uncommon in southwest FO (Styer 2019)
        • Twig without glands
          
          • Leaves tomentose abaxially
            ssp. tomentosa - shaggy-barked manzanita / woolyleaf manzanita
            Widespread in FO (Styer 2019)
          • Leaves glabrous abaxially
            ssp. hebeclada - explorer's manzanita
            In older FO docs; possibly mistaken for ssp. tomentosa
            Possibly not on FO, but nearby at Jacks Peak.
            
      • Smooth red bark
        A. crustacea
        (formerly a ssp. of A. tomentosa)
        
        • Lower leaf surface densely non-glandular-hairy
          ssp. crinita - Santa Cruz mountains manzanita
          (syn. A. tomentosa ssp. crinita)
          Widespread on FO (Styer 2019), or perhaps not (Kauffmann et al. 2015)
        • Lower leaf surface +/- moderately hairy to non-hairy
          ssp. crustacea. - Brittle-leaf manzanita
          (syn. A. tomentosa ssp. crustacea)
          Eastern FO (Styer 2019)
    • Stomata generally on both surfaces
      • A. glandulosa ssp. glandulosa - Eastwood's manzanita
        Uncommon on Inland Ranges of FO (Styer 2019)
  • Non-burl-forming
    • Stomata generally on lower surfaces
      • Lower leaf tomentose
        Prostrate to mounded
        A. pumila - Sandmat manzanita
        Widespread in western FO (Styer 2019)
        CNPS List 1B.2
      • Lower leaf glabrous or sparsely non-glandular hairy
        A. pajaroensis - Pajaro manzanita
        Uncommmon in eastern FO (Styer 2019)
        CNPS List 1B.1
    • Stomata generally on both surfaces
      • Erect
        • A. montereyensis - Toro manzanita / Monterey manzanita
          Widespread on FO (Styer 2019),
          but earlier docs tend describe it as rare on FO.
          CNPS List 1B.2
      • Prostrate to mounded
        • A. hookeri ssp. hookeri - Hooker's manzanita
          Widespread (central & northwest) on FO (Styer 2019)
          CNPS List 1B.2
           
• CNPS Ranks
  • 1B: Rare, Threatened, or Endangered in California and Elsewhere
    • .1: Seriously threatened
    • .2: Moderately threatened
  • 4: Plants of Limited Distribution - A Watch List
     
• 1975. Fort Ord Natural Resources Program - 1975 Report.
  Describes the Native Plant Reserves.
  
  • e.g. Area 1 (Reserve 1)
    A. tomentosa var hebeclada
    A. tomentosa var trichoclada
     
• 1976. Griffin. Native Plant Reserves at Fort Ord.
  "Good examples of both tomentosa and trichoclada forms grow together on Reserve 1"
  Also A. montereyensis on Reserve 1.
   
• 1978. Griffin. Mapped on Fort Ord: A. pumila, A. montereyensis, A. hookeri (central FO).
   
• 1980. Army map. Indicates. A.t.hebec. and A.t.tricho. at Reserve 1.
   
• 2003. Van Dyke & Holl. Mapping the Distribution of Maritime Chaparral Species in the Monterey Bay Area.
  - A. hookeri ssp. hookeri - central FO
  - A. montereyensis - mainly eastern FO
  - A. pajaroensis - rare on FO - 3 point locations
  - A. pumila - mainly western FO
   
• 2015. Kauffmann et al. Field Guide to Manzanitas.
   
  
• 2016. Yeager & Mitchell. Monterey County Wildflowers.
   
• 2019. Styer. Flora of Fort Ord.