Basswood Leaf

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LEAVES | Complexity | Arrangement | Shape | Venation | Apices | Bases | Margins | Lobes

TWIGS | Bud Types | Bud Scales | Scars | Surface | Pith

FRUITS | Types

 

Leaf Morphology: Complexity

whether a leaf is single bladed or split into several or many leaflets

Simple a leaf with a single blade
Palmately Compound leaflets radiate from the top of the petiole with no apparent rachis
Pinnately Compound leaflets are attached laterally along the rachis
Trifoliate (compound) a leaf that has three leaflets and may be either pinnate or palmate depending whether the terminal leaflet is attached to a rachis
Bipinnately Compound the leaflets are attached to a second-order rachis
Tripinnately Compound the leaflets are attached to a third-order rachis
Fan Palm "compound" leaves of palms

 

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Simple

a leaf with a single blade

  • Aceraceae Acer floridanum - Florida maple: Leaf, opposite, simple.
  • Betulaceae Alnus serrulata - hazel alder: Twig showing alternate leaf arrangement and stalked buds.
  • Rhamnaceae Berchemia scandens - Alabma supplejack: Leaf, alternate, simple, with typically wavy margin and notably parallel venation.
  • Fagaceae Castanea mollissima - Chinese chestnut: Leaves, alternate, simple, distinct parallel venation with each vein ending in a tooth.  Sun and shade leaves are very distinct.
  • Rosaceae Crataegus marshallii - parsley hawthorn: Leaf, alternate, simple, lobed with serrate margins.
  • Oleaceae Ligustrum sinense - Chinese privet: Leaf, opposite, simple, semi-evergreen, small (less than 2 inches long).
  • Moraceae Morus rubra - red mulberry: Leaf, alternate, simple, sandpapery texture (scabrous), variable in shape from unlobed to 5 lobes, serrate margin.
  • Rosaceae Prunus angustifolia - Chickasaw plum: Leaf, alternate, simple, often clustered on short shoots, typical display folded longitudinally.
  • Fagaceae Quercus alba - white oak: Leaf, alternate, simple, lobed but depth and number of lobes are extremely variable.
  • Smilacaceae Smilax bona-nox - saw greenbrier: Leaf, alternate, simple, usually three-lobed, always with prickles on margin or along midrib beneath.

 

Palmately Compound

leaflets radiate from the top of the petiole with no apparent rachis

  • Bignoniaceae Bignonia capreolata - crossvine: Leaves, opposite, trifoliately compound.  Two leaflets have a cordate base, the third leaflet is always a tendril.
  • Vitaceae Parthenocissus quinquefolia - Virginia creeper: Leaf, alternate, palmately compound, five leaflets, serrate margin.
  • Rutaceae Poncirus trifoliata - trifoliate orange: Leaf, alternate, trifoliately compound, very uniform cross-shape.

 

Pinnately Compound

leaflets are attached laterally along the rachis

  • Aceraceae Acer negundo- boxelder: Leaves, opposite, pinnately compound.
  • Bignoniaceae Campsis radicans - trumpet creeper: Leaf, opposite, pinnately compound, leaflets with toothed margins.
  • Juglandaceae Carya aquatica - water hickory: Leaves, alternate, pinnately compound, leaflets curved (falcate) and numerous similar to pecan.
  • Juglandaceae Carya ovata - shagbark hickory: Leaves, alternate, pinnately compound, usually 5 leaflets with the terminal three signficantly larger.
  • Oleaceae Fraxinus pennsylvanica - green ash: Leaves, opposite, pinnately compound.  Leaflets range from lanceolate to oval.
  • Fabaceae Gleditsia triacanthos - honeylocust: Leaves, alternate, pinnately or bipinnately compound leaves.
  • juglnigr_leaf1
  • Anacardiaceae Rhus glabra - smooth sumac: Leaf, alternate, pinnately compound, unwinged racchis.
  • Fabaceae Robinia pseudoacacia - black locust: Leaf, alternate, pinnately compound, leaflets rounded and oblong, color a bluish-grey-green.
  • Fabaceae Wisteria sinensis - Chinese wisteria: Leaf, alternate, pinnately compound.

 

Trifoliate (Compound)

a leaf that has three leaflets and may be either pinnate or palmate depending whether the terminal leaflet is attached to a rachis

  • Bignoniaceae Bignonia capreolata - crossvine: Leaves, opposite, trifoliately compound.  Two leaflets have a cordate base, the third leaflet is always a tendril.
  • Fabaceae Erythrina herbacea - southeastern coralbean: Leaf, alternate, trifoliately compound, distinctly lobed leaflets.
  • Fabaceae Erythrina herbacea - southeastern coralbean: Leaf, alternate, trifoliately compound, distinctly lobed leaflets.
  • Rutaceae Poncirus trifoliata - trifoliate orange: Leaf, alternate, trifoliately compound, very uniform cross-shape.
  • Fabaceae Pueraria montana - kudzu: Leaf, alternate, trifoliately compound, leaflets lobed, back often fuzzy.
  • Anacardiaceae Toxicodendron radicans - poison-ivy: Leaf, alternate, trifoliately compound, racchis usually red.  TOXIC, hence Leaves of three, let them be.
  • Anacardiaceae Toxicodendron radicans - poison-ivy: Leaf, alternate, trifoliately compound, racchis usually red.  TOXIC, hence Leaves of three, let them be.

 

Bipinnately Compound

the leaflets are attached to a second-order rachis

  • Fabaceae Albizia julibrissin - silktree: Leaf, alternate, bipinnately compound with very fine, delicate leaflets.
  • Fabaceae Albizia julibrissin - silktree: Leaves, alternate, bipinnately compound with very fine, delicate leaflets.
  • Caprifoliaceae Sambucus nigra ssp. canadensis - American black elderberry: Leaf, opposite, pinnately to bipinnately compound, racchis grooved.
  • Caprifoliaceae Sambucus nigra ssp. canadensis - American black elderberry: Leaf, opposite, pinnately to bipinnately compound, racchis grooved.

 

Tripinnately Compound

the leaflets are attached to a third-order rachis

  • Araliaceae Aralia spinosa - devil's walkingstick: Leaf, alternate, tripinnately compound, and large (up to 3 feet across).
  • Berberidaceae Nandina domestica - sacred bamboo: Leaf, alternate, tripinnately compound, large (more than 1 foot long), roughly triangular in shape, evergreen.
  • Vitaceae Nekemias arborea - peppervine: Leaf, alternate, tripinnately compound with a distinctly triangular overall leaf shape.
  • Vitaceae Nekemias arborea - peppervine: Leaf, alternate, bipinnately compound with a distinctly triangular overall leaf shape.

 

Fan Palm

"compound" leaves of palms

  • Arecaceae Sabal minor - dwarf palmetto: Leaves, alternate, palmately compound, fan shaped leaves emerge from a stem that is often not visible.
  • Arecaceae Sabal minor - dwarf palmetto: Leaves, alternate, palmately compound, fan shaped leaves emerge from a stem that is often not visible.

All definitions are from J. W. Hardin, D. J. Leopold, and F. M. White.  (2001).  Harlow & Harrar's Textbook of Dendrology.  Ninth edition.  McGraw Hill, New York, New York, 534 pp.  ISBN: 0073661716.

LEAVES | Complexity | Arrangement | Shape | Venation | Apices | Bases | Margins | Lobes

TWIGS | Bud Types | Bud Scales | Scars | Surface | Pith

FRUITS | Types

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Site Statistics

Species: 207 | Genera: 122 | Families: 67

All Photos: 2063 | Leaf Photos: 622 | Twig Photos: 511 | Bark Photos: 353 | Fruit Photos: 274 | Photos per Species: 10.0

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