Jepson Flora Project: Jepson Interchange    
 

The Jepson Manual: Higher Plants 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    THIS PAGE IS NO LONGER UPDATED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.

Names are linked to treatments from the Manual


Key to QUERCUS

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

  1. Cup scales thin, flat; bark dark gray or black; acorn shell woolly inside
 
    2. Leaf moderately to deeply lobed, sinuses between lobes 1/2+ width to midrib, lobes 1–4-toothed, teeth generally bristle-tipped; plants deciduous
Q. kelloggii
    2' Leaf entire to toothed, teeth abruptly pointed to spine-tipped, not bristle-tipped; plants evergreen
 
      3. Leaf upper surface convex, margin sometimes inrolled, obscuring marginal teeth, lower vein axils often hair-tufted, blade generally widely elliptic to round; fruit maturing in 1 year (on current twig)
Q. agrifolia
        4. Leaf lower surface glabrous to sparsely hairy (except vein axils)
var. agrifolia
        4' Leaf lower surface densely tomentose
var. oxyadenia
      3' Leaf ± flat, margin not inrolled, lower surface glabrous, blade generally lanceolate to oblong; fruit maturing in 2 years (on previous year's growth)
 
        5. Leaves 3–9 cm; leaf lower surface generally ± dull, olive-green; nut oblong below middle, abruptly tapered to tip
Q. parvula
          6. Shrub 1–3 m; n Channel Islands, n South Coast
var. parvula
          6' Tree < 17 m; w San Francisco Bay Area, Outer South Coast Ranges
var. shrevei
        5' Leaves 2–5 cm; leaf lower surface generally ± shiny, yellow-green; nut gradually tapered from below middle to tip
Q. wislizeni
          7. Shrub 2–4(6) m
var. frutescens
          7' Tree 10–22 m
var. wislizeni
  1' Cup scales generally thick, ± flat to generally clearly tubercled; bark light gray to whitish; acorn shell glabrous to woolly inside
 
    8. Acorn shell ± woolly inside; fruit maturing in 2 years; plants evergreen
 
      9. Leaves mostly 3–8 cm; acorn cup thick; generally tree
 
        10. Leaf lateral veins not clearly impressed on upper surface, lower surface golden-hairy, becoming glabrous
Q. chrysolepis
        10' Leaf lateral veins impressed on upper surface, lower surface densely tomentose, becoming sparsely tomentose — Channel Islands
Q. tomentella
      9' Leaves mostly 1–3.5 cm; acorn cup thin; shrub (or tree < 7 m)
 
        11. Twigs very stiff, rigid; leaf margin ± wavy, clearly spine-toothed; blade elliptic to round-ovate; plants 2–6 m, erect
Q. palmeri
        11' Twigs pliable; leaf margin generally entire, sometimes irregularly serrate, not spine-tipped; blade oblong to ovate; plants < 1.5 m, prostrate to spreading
Q. vacciniifolia
    8' Acorn shell glabrous inside; fruit maturing in 1 year; plants evergreen or deciduous
 
      12. Leaf lobed, sinuses between lobes generally > 1/4 distance from midrib to lobe tip; plants deciduous
 
        13. Leaf moderately to deeply lobed, some sinuses between lobes generally > 1/2 distance to midrib; upper surface ± shiny, dark green
 
          14. Acorn cup 10–30 mm deep, scales all clearly tubercled; nut 30–50 mm, generally long-conic in outline, gradually tapered to pointed tip (also see 17')
Q. lobata
          14' Acorn cup 4–9 mm deep, upper scales ± flat, lower scales slightly tubercled; nut 20–30 mm, ovoid to subspheric, tip ± rounded
Q. garryana
            15. Shrub 1–5 m; petiole 5–20 mm; leaf blade 4–9 cm
var. breweri
            15' Tree 8–20 m; petiole 10–25 mm; leaf blade 7–14 cm
var. garryana
        13' Leaf weakly lobed, sinuses between lobes generally < 1/2 distance to midrib; upper surface generally dull, green to bluish green
 
          16. Upper leaf surface green; acorn cup scales clearly tubercled; Channel Islands
Q. ×macdonaldii
          16' Upper leaf surface bluish or grayish green; acorn cup scales slightly tubercled; mainland
 
            17. Small tree (sometimes shrubby), semi-evergreen; leaves 1.5–5 cm, generally irregularly and coarsely toothed, upper surface bluish or grayish green
2 Q. ×alvordiana
            17' Tree, deciduous; leaves generally 3–6 cm, slightly lobed or subentire, upper surface bluish green
Q. douglasii
      12' Leaf entire to toothed, not lobed; plants evergreen
 
        18. Leaves generally 7–11 cm, clearly serrate (teeth 20–32), lateral veins 20–28, prominent; stipules persistent, > 10 mm, silky-hairy
Q. sadleriana
        18' Leaves 1–6 cm, entire to dentate, lateral veins generally < 20, not prominent; stipules early deciduous, < 10 mm, not silky-hairy
 
          19. Trees generally > 5 m; leaves 2–6 cm, oblong to obovate, entire or slightly toothed, upper surface often bluish green
 
            20. Tree < 6(10) m; leaves generally irregularly toothed to subentire, upper surface green to bluish green, ± glossy to dull
2 Q. ×acutidens
            20' Tree 5–18 m; leaves generally entire or wavy-dentate, upper surface blue-green, dull
Q. engelmannii
          19' Shrub generally < 5 m; leaves 1–5 cm, elliptic to ovate or roundish, variously toothed, upper surface generally green
 
            21. Leaf 2-colored, upper surface yellow- or gray-green, lower surface whitish, densely finely tomentose, hairs obscuring lateral veins
Q. cornelius-mulleri
            21' Leaf 1–2-colored, upper surface green to gray- or bluish green, lower surface generally green, not densely tomentose, hairs not obscuring lateral veins
 
              22. Leaf generally oblong to obovate, margin wavy to obtusely toothed — Peninsular Ranges
2 Q. ×acutidens
              22' Leaf elliptic to ovate or roundish, margin clearly toothed, teeth abruptly pointed to spine-tipped
 
                23. Acorn cup thin, scales ± flat to slightly tubercled; upper leaf surface gray- or bluish green, dull
 
                  24. Acorn stalked (stalk < 15 mm), nut cylindric-ovoid to elliptic in outline, abruptly tapered at tip, 12–23 mm, generally yellow-brown; leaves oblong to elliptic, regularly spine-toothed — eastern Desert Mountains
Q. turbinella
                  24' Acorn sessile, nut conic-ovoid, gradually tapered to tip, 20–40 mm, generally dark brown; leaves oblong to elliptic or obovate, irregularly toothed, teeth blunt to weakly spiny
 
                    25. Shrub or small tree; leaves 1.5–5 cm, marginal teeth not spiny, upper surface bluish to grayish green
2 Q. ×alvordiana
                    25' Shrub; leaves 1.3–2.8 cm, irregularly spine-toothed, upper surface grayish green
Q. john-tuckeri
                23' Acorn cup thick, scales tubercled; upper leaf surface generally green, ± shiny (sometimes dull in Q. durata)
 
                  26. Upper leaf surface convex, margin often inrolled, obscuring teeth, dull
Q. durata
                    27. Upper leaf surface strongly convex; lower leaf surface short-hairy; generally serpentine soils, North Coast Ranges, n Sierra Nevada Foothills, South Coast Ranges
var. durata
                    27' Upper leaf surface slightly convex; lower leaf surface densely short-hairy when young; nonserpentine soils, s San Gabriel Mountains
var. gabrielensis
                  26' Upper leaf surface flat to ± wavy, not convex, margin generally not inrolled, ± shiny
 
                    28. Fruit 10–30 mm; acorn cup thick, 12–20 mm wide, scales strongly tubercled; nut ovoid; chaparral, 300–1500 m
Q. berberidifolia
                    28' Fruit < 20 mm; acorn cup thin, 8–15 mm wide, scales slightly to moderately tubercled; nut conic-ovoid; chaparral or coastal-sage scrub, < 200 m
Q. dumosa


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