View source for Quercus tomentella

{{Treatment/ID
|accepted_name=Quercus tomentella
|accepted_authority=Engelmann
|publications={{Treatment/Publication
|title=Trans. Acad. Sci. St. Louis,
|place=3: 393. 1877
|year=1877
}}
|common_names=Channel Island oak
|special_status={{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}
|basionyms=
|synonyms=
|hierarchy=Fagaceae;Quercus;Quercus sect. Protobalanus;Quercus tomentella
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Fagaceae]]</div><div class="higher-taxon"><small>genus</small>[[Quercus]]</div><div class="higher-taxon"><small>section</small>[[Quercus sect. Protobalanus]]</div><div class="higher-taxon"><small>species</small>[[Quercus tomentella]]</div></div>
|volume=Volume 3
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-d0_s0" data-properties="whole_organism some measurement;whole_organism growth form"><b>Trees,</b> to 20 m.</span> <span class="statement" id="st-d0_s1" data-properties="twig architecture;twig coloration;twig diameter;twig texture;twig pubescence;twig duration;angle quantity"><b>Twigs </b>branching at 45° angles, reddish-brown, 3-4 mm diam., somewhat rigid, densely tomentose, persistent into 2d year.</span> <span class="statement" id="st-d0_s2" data-properties="terminal bud shape;terminal bud some measurement;scale coloration;margin architecture or pubescence or shape"><b>Terminal </b>buds conic, 7-10 mm, scales brown with ciliate margins.</span> <span class="statement" id="st-d0_s3" data-properties="petiole some measurement;petiole pubescence;petiole shape"><b>Leaves:</b> petiole 3-10 mm, rusty-villous, flattened adaxially.</span> <span class="statement" id="st-d0_s4" 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 shape;leaf-blade atypical length;leaf-blade atypical length;leaf-blade length;leaf-blade width;leaf-blade texture;leaf-blade fragility;base shape;secondary-vein atypical quantity;secondary-vein quantity;secondary-vein architecture;secondary-vein architecture or shape;secondary-vein prominence;secondary-vein prominence;angle quantity;margin shape or vernation;margin shape;cell-wall size or width;tooth shape;apex shape;apex shape;apex shape"><b>Leaf-</b>blade wavy or distinctly concave, oblong-lanceolate or elliptic, acuminate, (30-) 70-10 (-120) × 25-40 mm, leathery and brittle, base obtuse to cordate, secondary-veins 8-10 (-12) pairs, branching at 45-50° angles, strongly pinnate, raised abaxially, often sunken adaxially, margins often strongly revolute, with slightly thickened cell-walls, entire or crenate to dentate with mucronate teeth, apex rounded or acute, mucronate;</span> <span class="statement" id="st-d0_s5" data-properties="surface pubescence;hair coloration;midrib pubescence;midrib reflectance;midrib coloration;midrib pubescence">surfaces abaxially densely tomentose with whitish nonglandular hairs, midrib pilose, adaxially glossy dark green, sparsely pubescent.</span> <span class="statement" id="st-d0_s6" data-properties="acorn arrangement;acorn arrangement"><b>Acorns </b>solitary or rarely paired;</span> <span class="statement" id="st-d0_s7" data-properties="cup shape;cup width;cup width;scale fusion;scale fixation or orientation;scale relief;scale pubescence;apex width;apex coloration;apex length;apex prominence">cup shallowly cupshaped, 4-8 mm deep × 15-30 mm wide, scales laterally connate, appressed, deeply imbedded in tomentum, with only thin, brown, elongated apices visible, tuberculate, densely whitish-brown-tomentose throughout;</span> <span class="statement" id="st-d0_s8" data-properties="nut shape;nut length;nut width;apex shape">nut ovoid, 20-30 × 15-20 mm, apex rounded.</span><!--

-->{{Treatment/Body
|phenology=Flowering in spring, occasionally in fall.
|habitat=Lower portions of steep canyons and occasionally ridge tops
|elevation=100-650 m
|distribution=Calif.;Mexico (Baja California and on Guadalupe Island)
|discussion=<p>The insular endemic Quercus tomentella is a relict as evidenced by its widespread representation in mainland late Tertiary fossil floras. Hybridization with Q. chrysolepis is apparent on the Channel Islands: Santa Catalina, Santa Cruz, and possibly San Clemente and Anacapa. Putative hybrids have been observed in narrow zones of contact on the islands of Santa Cruz and Santa Catalina. On those islands, taxonomically distinct individuals of Q. chrysolepis occur at the highest elevations, whereas Q. tomentella generally is found in moist canyons at lower elevations. Populations of Channel Island oak are in decline because of overgrazing and poor seedling recruitment. The greatest number of populations occur on Santa Rosa Island, and those are taxonomically and genetically noteworthy because Q. chrysolepis apparently is absent from the island.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Quercus tomentella
|authority=Engelmann
|rank=species
|parent rank=section
|synonyms=
|basionyms=
|family=Fagaceae
|phenology=Flowering in spring, occasionally in fall.
|habitat=Lower portions of steep canyons and occasionally ridge tops
|elevation=100-650 m
|distribution=Calif.;Mexico (Baja California and on Guadalupe Island)
|reference=None
|publication title=Trans. Acad. Sci. St. Louis,
|publication year=1877
|special status=Illustrated
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V3/V3_66.xml
|genus=Quercus
|section=Quercus sect. Protobalanus
|species=Quercus tomentella
|acorn arrangement=paired;solitary
|angle quantity=45;50
|apex coloration=brown
|apex length=elongated
|apex prominence=visible
|apex shape=rounded;mucronate;acute;rounded
|apex width=thin
|base shape=obtuse;cordate
|cell-wall size or width=thickened
|cup shape=cup-shaped
|cup width=×15-30;4mm;8mm
|hair coloration=whitish
|leaf-blade atypical length=10mm;120mm
|leaf-blade fragility=brittle
|leaf-blade length=70mm;10mm
|leaf-blade shape=acuminate;elliptic;oblong-lanceolate;concave;wavy;elliptic;oblong-lanceolate;concave;wavy
|leaf-blade texture=leathery
|leaf-blade width=25mm;40mm
|margin architecture or pubescence or shape=ciliate
|margin shape=crenate;dentate
|margin shape or vernation=revolute
|midrib coloration=dark green
|midrib pubescence=pubescent;pilose
|midrib reflectance=glossy
|nut length=20mm;30mm
|nut shape=ovoid
|nut width=15mm;20mm
|petiole pubescence=rusty-villous
|petiole shape=flattened
|petiole some measurement=3mm;10mm
|scale coloration=brown
|scale fixation or orientation=appressed
|scale fusion=connate
|scale pubescence=whitish-brown-tomentose
|scale relief=tuberculate
|secondary-vein architecture=branching
|secondary-vein architecture or shape=pinnate
|secondary-vein atypical quantity=10;12
|secondary-vein prominence=sunken;raised
|secondary-vein quantity=8;10
|surface pubescence=tomentose
|terminal bud shape=conic
|terminal bud some measurement=7mm;10mm
|tooth shape=mucronate
|twig architecture=branching
|twig coloration=reddish-brown
|twig diameter=3mm;4mm
|twig duration=persistent
|twig pubescence=tomentose
|twig texture=rigid
|whole_organism growth form=tree
|whole_organism some measurement=0m;20m
}}<!--

-->[[Category:Treatment]][[Category:Quercus sect. Protobalanus]]