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| − | --><span class="statement" id="st-d0_s0" data-properties="tree duration;trunk quantity;trunk quantity;trunk quantity;trunk quantity"><b>Trees,</b> deciduous, with single trunks, sometimes with few to several trunks.</span> <span class="statement" id="st-d0_s1" data-properties="bark coloration;bark architecture or pubescence"><b>Bark </b>gray, scaly.</span> <span class="statement" id="st-d0_s2" data-properties="twig coloration;twig coloration;twig some measurement;twig pubescence;twig pubescence"><b>Twigs </b>reddish or yellowish, ca. 2 mm, densely or sparsely puberulent, occasionally glabrate with age.</span> <span class="statement" id="st-d0_s3" data-properties="bud coloration;bud coloration;bud shape;bud shape;bud shape;bud atypical some measurement;bud some measurement"><b>Buds </b>reddish-brown, rarely yellowish, broadly ovoid to rarely subglobose, (2-) 3-5 mm;</span> <span class="statement" id="st-d0_s4" data-properties="scale pubescence;scale pubescence;margin architecture or pubescence or shape">scales glabrous except for ciliate margins, sometimes sparsely or densely pubescent.</span> <span class="statement" id="st-d0_s5" data-properties="petiole coloration;petiole some measurement"><b>Leaves:</b> petiole blue-green, 2-6 mm.</span> <span class="statement" id="st-d0_s6" data-properties="leaf-blade shape;leaf-blade shape;leaf-blade shape;leaf-blade shape;leaf-blade shape;leaf-blade shape;leaf-blade shape;leaf-blade shape;leaf-blade atypical length;leaf-blade atypical length;leaf-blade length;leaf-blade atypical width;leaf-blade atypical width;leaf-blade width;base shape;base shape;base shape;margin shape;margin shape;margin architecture or shape;lobe shape;lobe shape;secondary-vein quantity;apex shape;apex shape"><b>Leaf-</b>blade obovate or elliptic, oblong or oblanceolate, (20-) 40-60 (-80) × (15-) 20-30 (-40) mm, base rounded-attenuate or rounded, rarely cuneate, margins shallowly lobed or irregularly toothed, sometimes entire, lobes mucronate or rounded, secondary-veins 6-10 on each side, apex rounded, rarely moderately acute;</span> <span class="statement" id="st-d0_s7" data-properties="surface coloration;surface coloration;surface texture;surface size;surface coloration;surface pubescence;surface coloration;hair arrangement;hair arrangement;hair arrangement;hair orientation;hair arrangement or shape;hair diameter">surfaces abaxially light green or blue-green, waxy, with scattered to crowded, semierect, (2-) 4-6 (-8) -rayed stellate hairs usually 0.2-0.6 mm diam. or larger, adaxially blue-green, glaucous or grayish, vestiture similar to abaxial surface.</span> <span class="statement" id="st-d0_s8" data-properties="acorn architecture;acorn architecture or arrangement or growth form"><b>Acorns </b>subsessile, solitary;</span> <span class="statement" id="st-d0_s9" data-properties="nut cup shape;nut cup shape;nut cup coloration or size;nut cup width;nut cup width;scale width;scale relief;scale relief">cup hemispheric or cupshaped, rarely deeper, 5-10 mm deep × 10-15 mm wide, enclosing only base of nut, scales thin and not tuberculate to strongly and irregularly tuberculate, particularly toward base of cup;</span> <span class="statement" id="st-d0_s10" data-properties="nut architecture;nut shape;nut shape;nut length;nut width">nut thin-walled, fusiform or subcylindric, 20-30 × 10-16 mm.</span> <span class="statement" id="st-d0_s11" data-properties=""><b>Cotyledons </b>distinct.</span> <span class="statement" id="st-d0_s12" data-properties="cotyledon fusion;2n chromosome quantity">2n = 24.</span><!-- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Trees,</b> deciduous, with single trunks, sometimes with few to several trunks. <b>Bark</b> gray, scaly. <b>Twigs</b> reddish or yellowish, ca. 2 mm, densely or sparsely puberulent, occasionally glabrate with age. <b>Buds</b> reddish brown, rarely yellowish, broadly ovoid to rarely subglobose, (2-)3-5 mm; scales glabrous except for ciliate margins, sometimes sparsely or densely pubescent. <b>Leaves</b>: petiole blue-green, 2-6 mm. <b>Leaf</b> blade obovate or elliptic, oblong or oblanceolate, (20-)40-60(-80) × (15-)20-30(-40) mm, base rounded-attenuate or rounded, rarely cuneate, margins shallowly lobed or irregularly toothed, sometimes entire, lobes mucronate or rounded, secondary veins 6-10 on each side, apex rounded, rarely moderately acute; surfaces abaxially light green or blue-green, waxy, with scattered to crowded, semi-erect, (2-)4-6(-8)-rayed stellate hairs usually 0.2-0.6 mm diam. or larger, adaxially blue-green, glaucous or grayish, vestiture similar to abaxial surface. <b>Acorns</b> subsessile, solitary; cup hemispheric or cup-shaped, rarely deeper, 5-10 mm deep × 10-15 mm wide, enclosing only base of nut, scales thin and not tuberculate to strongly and irregularly tuberculate, particularly toward base of cup; nut thin-walled, fusiform or subcylindric, 20-30 × 10-16 mm. <b>Cotyledons</b> distinct. <b>2n</b> = 24.</span><!-- |
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| | |publication year=1840 | | |publication year=1840 |
| | |special status=Endemic;Selected by author to be illustrated | | |special status=Endemic;Selected by author to be illustrated |
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/287ef3db526bd807d435a3c7423ef2df1e951227/V3/V3_30.xml | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V3/V3_30.xml |
| | |genus=Quercus | | |genus=Quercus |
| | |section=Quercus sect. Quercus | | |section=Quercus sect. Quercus |
| | |species=Quercus douglasii | | |species=Quercus douglasii |
| − | |2n chromosome quantity=24
| |
| − | |acorn architecture=subsessile
| |
| − | |acorn architecture or arrangement or growth form=solitary
| |
| − | |apex shape=acute;rounded
| |
| − | |bark architecture or pubescence=scaly
| |
| − | |bark coloration=gray
| |
| − | |base shape=cuneate;rounded;rounded-attenuate
| |
| − | |bud atypical some measurement=2mm;3mm
| |
| − | |bud coloration=yellowish;reddish-brown
| |
| − | |bud shape=broadly ovoid;rarely subglobose
| |
| − | |bud some measurement=3mm;5mm
| |
| − | |cotyledon fusion=distinct
| |
| − | |hair arrangement=scattered;crowded
| |
| − | |hair arrangement or shape=stellate
| |
| − | |hair diameter=0.2mm;0.6mm
| |
| − | |hair orientation=semierect
| |
| − | |leaf-blade atypical length=60mm;80mm
| |
| − | |leaf-blade atypical width=30mm;40mm
| |
| − | |leaf-blade length=40mm;60mm
| |
| − | |leaf-blade shape=oblanceolate;oblong;elliptic;obovate;oblanceolate;oblong;elliptic;obovate
| |
| − | |leaf-blade width=20mm;30mm
| |
| − | |lobe shape=rounded;mucronate
| |
| − | |margin architecture or pubescence or shape=ciliate
| |
| − | |margin architecture or shape=entire
| |
| − | |margin shape=toothed;lobed
| |
| − | |nut architecture=thin-walled
| |
| − | |nut cup coloration or size=deeper
| |
| − | |nut cup shape=cup-shaped;hemispheric
| |
| − | |nut cup width=×10-15;5mm;10mm
| |
| − | |nut length=20mm;30mm
| |
| − | |nut shape=subcylindric;fusiform
| |
| − | |nut width=10mm;16mm
| |
| − | |petiole coloration=blue-green
| |
| − | |petiole some measurement=2mm;6mm
| |
| − | |scale pubescence=pubescent;glabrous
| |
| − | |scale relief=tuberculate;not tuberculate
| |
| − | |scale width=thin
| |
| − | |secondary-vein quantity=6;10
| |
| − | |surface coloration=grayish;blue-green;blue-green;light green
| |
| − | |surface pubescence=glaucous
| |
| − | |surface size=larger
| |
| − | |surface texture=ceraceous
| |
| − | |tree duration=deciduous
| |
| − | |trunk quantity=few;several
| |
| − | |twig coloration=yellowish;reddish
| |
| − | |twig pubescence=glabrate;puberulent
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| − | |twig some measurement=2
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| | -->[[Category:Treatment]][[Category:Quercus sect. Quercus]] | | -->[[Category:Treatment]][[Category:Quercus sect. Quercus]] |
Trees, deciduous, with single trunks, sometimes with few to several trunks. Bark gray, scaly. Twigs reddish or yellowish, ca. 2 mm, densely or sparsely puberulent, occasionally glabrate with age. Buds reddish brown, rarely yellowish, broadly ovoid to rarely subglobose, (2-)3-5 mm; scales glabrous except for ciliate margins, sometimes sparsely or densely pubescent. Leaves: petiole blue-green, 2-6 mm. Leaf blade obovate or elliptic, oblong or oblanceolate, (20-)40-60(-80) × (15-)20-30(-40) mm, base rounded-attenuate or rounded, rarely cuneate, margins shallowly lobed or irregularly toothed, sometimes entire, lobes mucronate or rounded, secondary veins 6-10 on each side, apex rounded, rarely moderately acute; surfaces abaxially light green or blue-green, waxy, with scattered to crowded, semi-erect, (2-)4-6(-8)-rayed stellate hairs usually 0.2-0.6 mm diam. or larger, adaxially blue-green, glaucous or grayish, vestiture similar to abaxial surface. Acorns subsessile, solitary; cup hemispheric or cup-shaped, rarely deeper, 5-10 mm deep × 10-15 mm wide, enclosing only base of nut, scales thin and not tuberculate to strongly and irregularly tuberculate, particularly toward base of cup; nut thin-walled, fusiform or subcylindric, 20-30 × 10-16 mm. Cotyledons distinct. 2n = 24.
Phenology: Flowering late winter–spring.
Habitat: Oak woodlands, margins of chaparral and grasslands
Elevation: 0-1200 m
Discussion
Populations of Quercus douglasii in coastal southern California and on the Channel Islands consist of small stands or solitary individuals often associated with Q. lobata and scrub oaks. Some doubt exists as to whether some or all of those populations are natural stands or are historical introductions near Native American settlements. Along the canyons of Santa Barbara County, putative hybrids between Q. douglasii and Q. dumosa are referred to Q. ×kinselae (C. H. Muller) Nixon. In the interior Coast Ranges of California are found numerous populations that are intermediate in form between Q. douglasii and Q. john-tuckeri (= Q. turbinella var. californica). This appears to be an area of secondary contact, and the two species remain distinct in nearby populations. Because of the widespread nature of the intermediates, following Tucker's extensive studies they can be conveniently referred to as the nothospecies Q. ×alvordiana Eastwood. The plants tend to be shrubs to small trees, with somewhat more spinose leaves than Q. douglasii and fruit similar to those of the latter species.
Selected References
None.
