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: Bases

the shape of the end of the leaf where the petiole attaches

Cuneate wedge-shaped, tapering evenly to a narrow base
Acute shaped like an acute angle
Cordate heart-shaped, inversely indented
Inequilateral asymmetrical if folded along the petiole, also called oblique
Obtuse blunt, narrowly rounded
Rounded a full sweeping arc
Truncate cut off at right angles to the midrib
Auriculate earlike lobes pointing toward the petiole

 

Hold cursor over photos to view species name and info

 

Cuneate

wedge-shaped, tapering evenly to a narrow base

  • Rosaceae Crataegus marshallii - parsley hawthorn: Leaf, alternate, simple, lobed with serrate margins.
  • Fagaceae Quercus laurifolia - laurel oak: Leaves, alternate, simple, unlobed, bristle-tipped.
  • Fagaceae Quercus nigra - water oak: Leaf, alternate, unlobed, bristle-tipped, shape variable from lanceolate to spatulate.  Leaves are sometimes more lobed on seedlings like this one.
  • Salicaceae Salix babylonica - weeping willow: Leaf, alternate, simple, linear in shape.

 

Acute

shaped like an acute angle

  • Rosaceae Aronia arbutifolia - red chokeberry: Leaf, alternate, simple, distinct serrulate margin, back with silver tomentum.
  • Rosaceae Aronia arbutifolia - red chokeberry: Leaf, alternate, simple, distinct serrulate margin, back with silver tomentum.
  • Annonaceae Asimina triloba - pawpaw: Leaf, alternate, simple obovate with acuminate tip.
  • Smilacaceae Smilax smallii - lanceleaf greenbrier: Leaf, alternate, simple, elliptical to lanceolate in shape.

 

Cordate

heart-shaped, inversely indented

  • Bignoniaceae Catalpa speciosa - northern catalpa: Leaf, simple, whorled, cordate, can be large, about 1 foot long.
  • Fabaceae Cercis canadensis - eastern redbud: Leaf, alternate, simple, showing distinct heart shape (cordate).
  • Tiliaceae Tilia americana var. caroliniana - Carolina basswood: Leaves, alternate, simple, cordate in shape, margin coarsely serrate.
  • Vitaceae Vitis aestivalis - summer grape: Leaf, alternate, simple, ranging in size and shape, from round and unlobed to deltoid and lobed.

 

Inequilateral

asymmetrical if folded along the petiole, also called oblique

  • Ulmaceae Celtis laevigata - sugarberry: Leaves, alternate, simple, inequilateral leaf base, distinct primary veins forming a 'W'.
  • Fagaceae Quercus pagoda - cherrybark oak: Leaf, alternate, simple, lobes bristle-tipped, shaped like a Japanese pagoda when turned upside down, base acute and straight, not curved.
  • Ulmaceae Ulmus alata - winged elm: Twig, showing alternate leaf arrangement, corky wings.
  • Ulmaceae Ulmus americana - American elm: Leaf, alternate, simple, oval in shape, acuminate tip, doubly serrate margin, often sandpapery (scabrous) on top of leaf only.
  • Ulmaceae Ulmus rubra - slippery elm: Leaf, alternate, simple, elliptically shaped, doubly serrate, very sandpapery (scabrous) both above and below.

 

Obtuse

blunt, narrowly rounded

  • Rhamnaceae Berchemia scandens - Alabma supplejack: Leaf, alternate, simple, with typically wavy margin and notably parallel venation.
  • Caprifoliaceae Lonicera japonica - Japanese honeysuckle: Leaves, opposite, simple, on fuzzy vine.
  • Rosaceae Prunus caroliniana - Carolina laurelcherry: Leaves, alternate, simple, evergreen, margins entire to serrulate, often with occasional teeth.

 

Rounded

a full sweeping arc

  • Aceraceae Acer rubrum - red maple: Leaves, opposite simple.
  • Styracaceae Halesia diptera - two-wing silverbell: Leaf, alternate, simple, oval in shape, margin wavy to entire, prominently acuminate tip.
  • Aquifoliaceae Ilex vomitoria - yaupon: Leaves, alternate, simple, evergreen, wavy teeth on margins.

 

Truncate

cut off at right angles to the midrib

  • Betulaceae Betula nigra - river birch: Leaf, alternate, simple, doubly serrate margins, deltoid shape.
  • Polygonaceae Brunnichia ovata - American buckwheat vine: Leaf, alternate, simple, truncate to cordate base.
  • Magnoliaceae Liriodendron tulipifera - yellow-poplar: Leaf, alternate, simple, truncate apex with two basal lobes form a distinct shape.  Sometimes smells spicy when crushed.
  • Moraceae Morus rubra - red mulberry: Leaf, alternate, simple, sandpapery texture (scabrous), variable in shape from unlobed to 5 lobes, serrate margin.
  • Smilacaceae Smilax rotundifolia - roundleaf greenbrier: Leaf, alternate, simple, variable in shape but usually deltoid to orbicular.

 

Auriculate

earlike lobes pointing toward the petiole

  • Bignoniaceae Bignonia capreolata - crossvine: Leaves, opposite, trifoliately compound.  Two leaflets have a cordate base, the third leaflet is always a tendril.
  • Polygonaceae Brunnichia ovata - American buckwheat vine: Leaf, alternate, simple, truncate to cordate base.
  • Magnoliaceae Magnolia macrophylla - bigleaf magnolia: Leaf, alternate, simple, large (18 inches long or longer), with earlobe leaf base (auriculate), and a white, fuzzy back side.

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

Hits: 28883

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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