The Jepson Manual: Higher Plants of California

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Names are linked to treatments from the Manual


Key to HORDEUM

N.B.: couplets are linked, e.g., 1. is linked to 1'.

  1. Perennial
 
    2. Central spikelet glumes 20–80 mm, spreading with age
 
      3. Glumes 20–26 mm, flat near base; lemma awn of central spikelet 17–20 mm
 2 H. arizonicum
      3' Glumes 35–80 mm, not flat; lemma awn of central spikelet 25–90 mm
 2 H. jubatum
    2' Central spikelet glumes 7–19 mm, spreading or straight with age
 H. brachyantherum
      4. Basal leaf sheaths glabrous to short-hairy; lemma awn of central spikelet < 4.5 mm; glumes generally straight
subsp. brachyantherum
      4' Basal leaf sheaths short- and long-hairy; lemma awn of central spikelet < 7.5 mm; glumes generally spreading
subsp. californicum
  1' Annual
 
    5. Leaf sheath appendages well-developed, 1–4 mm; lateral florets except awns 8–14 mm
 H. murinum
      6. Central spikelet sessile to subsessile, stalk < 0.5 mm; central floret (except awn) generally = lateral spikelet floret; palea of lateral floret ± glabrous
 subsp. murinum
      6' Central spikelet stalk 1–2 mm; central floret (except awn) < lateral spikelet floret; palea of lateral floret hairy
 
        7. Central floret slightly < lateral floret; anthers of lateral florets > 2 × anthers of central floret
 subsp. glaucum
        7' Central floret << lateral florets; anthers of central and lateral florets ± equal
 subsp. leporinum
    5' Leaf sheath appendages < 2 mm or 0; lateral florets except awns < 5 mm
 
      8. Lemma of central spikelet with awn 10–90 mm
 
        9. Glumes straight with age
 2 H. marinum subsp. gussoneanum
        9' Glumes spreading with age
 
          10. Central spikelet glumes flat near base
 2 H. arizonicum
          10' Central spikelet glumes not flat
 2 H. jubatum
      8' Lemma of central spikelet with awn 3–12 mm
 
        11. Lemma of lateral spikelet with awn 3–8 mm
 2 H. marinum subsp. gussoneanum
        11' Lemma of lateral spikelet with awn < 2 mm
 
          12. Glumes of central spikelet slightly flat or rounded near base
 H. depressum
          12' Glumes of central spikelet clearly flat near base
 H. intercedens

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