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: Lobing

the degree to which the blade of a leaf is indented towards the midrib (leaves are only considered lobed if indented more than 1/4 the distance from edge to midrib)

Pinnate: Lobed lobes indented one-quarter to one-half towards the midrib
Pinnate: Cleft lobes indented just over one-half towards the midrib
Pinnate: Incised lobes indented deeply to near the midrib
Palmate: Lobed lobes indented more than one-quarter, but towards the leaf base

 

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Pinnate: Lobed

lobes indented one-quarter to one-half towards the midrib

  • Fagaceae Quercus alba - white oak: Leaf, alternate, simple, lobed but depth and number of lobes are extremely variable.
  • Fagaceae Quercus macrocarpa - bur oak: Leaves, alternate, simple, lobed to varying depths along length, with lobes on the lower half of the leaf usually deeper.
  • Fagaceae Quercus stellata - post oak: Leaf, alternate, simple, lobed, lobes often cross-shaped (cruciform).
  • Fagaceae Quercus stellata - post oak: Leaf, alternate, simple, lobed, lobes often cross-shaped (cruciform).

 

Pinnate: Cleft

lobes indented just over one-half towards the midrib

  • Fagaceae Quercus falcata - southern red oak: Leaf, alternate, simple, lobes with bristle tips, base rounded and bell-shaped, leaf curved (falcate).
  • Fagaceae Quercus falcata - southern red oak: Leaf, alternate, simple, lobes with bristle tips, base rounded and bell-shaped, leaf curved (falcate).
  • Fagaceae Quercus lyrata - overcup oak: Leaf, alternate, simple, deeply lobed, whitish fuzz on back side.
  • 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.
  • Fagaceae Quercus shumardii - Shumard oak: Leaf, alternate, simple, lobes bristle-tipped, incised almost to midrib very uniformly and often symmetrically, axillary tomentum (think armpit hair).

 

Pinnate: Incised

lobes indented deeply to near the midrib

  • Fagaceae Quercus alba - white oak: Leaf, alternate, simple, lobed but depth and number of lobes are extremely variable.
  • Fagaceae Quercus shumardii - Shumard oak: Leaf, alternate, simple, lobes bristle-tipped, incised almost to midrib very uniformly and often symmetrically, axillary tomentum (think armpit hair).
  • Fagaceae Quercus shumardii - Shumard oak: Leaf, alternate, simple, lobes bristle-tipped, incised almost to midrib very uniformly and often symmetrically, axillary tomentum (think armpit hair).
  • Fagaceae Quercus stellata - post oak: Leaf, alternate, simple, lobed, lobes often cross-shaped (cruciform).

 

Palmate: Lobed

lobes indented more than one-quarter, but towards the leaf base

  • Aceraceae Acer floridanum - Florida maple: Leaf, opposite, simple.
  • Aceraceae Acer palmatum - Japanese maple: Leaves, opposite, simple.
  • Hamamelidaceae Liquidambar styraciflua - sweetgum: Leaf, alternate, simple, five-lobed, smells of turpentine when crushed.
  • Moraceae Morus rubra - red mulberry: Leaf, alternate, simple, sandpapery texture (scabrous), variable in shape from unlobed to 5 lobes, serrate margin.
  • Vitaceae Vitis aestivalis - summer grape: Leaf, alternate, simple, ranging in size and shape, from round and unlobed to deltoid and lobed.

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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