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: Apices

the shape of the tip of the leaf furthest from the petiole

Acuminate shaped like an acute angle with a long attenuated point
Acute shaped like an acute angle but not attenuated
Mucronate abruptly tipped with a bristly midrib extension (mucro)
Cuspidate tip concavely constricted to an elongated sharp, rigid point
Obtuse blunt, the sides forming an angle of more than 90 degrees
Rounded a full sweeping arc
Truncate cut off at right angles to the midrib
Retuse with a shallow, narrow notch
Emarginate with a shallow, broad notch

 

Hold cursor over photos to view species name and info

 

Acuminate

shaped like an acute angle with a long attenuated point

  • Fagaceae Fagus grandifolia - American beech: Leaf, alternate, simple, parallel veins each ending in a small tooth.
  • Moraceae Maclura pomifera - osage-orange: Leaf, alternate, simple, acuminate tip.
  • Myricaceae Morella caroliniensis - southern bayberry: Leaf, alternate, simple, toothed.
  • Cornaceae Nyssa sylvatica - blackgum: Leaf, alternate, simple, occassionally toothed.
  • Euphorbiaceae Triadica sebifera - Chinese tallowtree: Leaf, alternate, simple, rhombic in shape.

 

Acute

shaped like an acute angle but not attenuated

  • Magnoliaceae Magnolia virginiana - sweetbay: Leaf, alternate, simple, leathery, semi-evergreen, back side covered in silver fuzz.
  • Myricaceae Morella cerifera - wax myrtle: Leaves, alternate, simple, toothed, densely covered above and below with minute yellow glands.
  • Lauraceae Persea borbonia - redbay: Leaf, alternate, simple, smells spicy when crushed.
  • Anacardiaceae Rhus aromatica - fragrant sumac: Leaves, alternate, trifoliately compound, fragrant if crushed.  Catkin-like clustered flower buds are visible.

 

Mucronate

abruptly tipped with a bristly midrib extension (mucro)

  • Fagaceae Quercus incana - bluejack oak: Leaf, simple, alternate, unlobed, bristle tipped, bluish-white fuzz on back side of leaf.
  • 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.

 

Cuspidate

tip concavely constricted to an elongated sharp, rigid point

  • Aquifoliaceae Ilex coriacea - tall gallberry holly: Leaf, alternate, simple, evergreen, with one or several spines on the top half of the leaf margin, fewer than American holly.
  • Aquifoliaceae Ilex opaca - American holly: Leaf, alternate, simple, spines on margins, evergreen, thick and woody.

 

Obtuse

blunt, the sides forming an angle of more than 90 degrees

  • Rosaceae Prunus caroliniana - Carolina laurelcherry: Leaves, alternate, simple, evergreen, margins entire to serrulate, often with occasional teeth.
  • Smilacaceae Smilax glauca - cat greenbrier: Leaf, alternate, simple, back covered in waxy white glaucous bloom.

 

Rounded

a full sweeping arc

  • Aquifoliaceae Ilex vomitoria - yaupon: Leaves, alternate, simple, evergreen, wavy teeth on margins.
  • Oleaceae Ligustrum sinense - Chinese privet: Leaf, opposite, simple, semi-evergreen, small (less than 2 inches long).
  • Rubiaceae Mitchella repens - partridgeberry: Fruit, drupe, formed from two flowers as evidenced by two white dots on each drupe.

 

Truncate

cut off at right angles to the midrib

  • Fagaceae Quercus stellata - post oak: Leaf, alternate, simple, lobed, lobes often cross-shaped (cruciform).

 

Retuse

with a shallow, narrow notch

  • Fagaceae Quercus stellata - post oak: Leaf, alternate, simple, lobed, lobes often cross-shaped (cruciform).

 

Emarginate

with a shallow, broad notch

  • Magnoliaceae Liriodendron tulipifera - yellow-poplar: Leaf, alternate, simple, truncate apex with two basal lobes form a distinct shape.  Sometimes smells spicy when crushed.

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: 19120

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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