Leaf shape

In botany, leaf shape is characterised with the following terms (botanical Latin terms in brackets):

• Acicular (acicularis): Slender and pointed, needle-like
• Acuminate (acuminata): Tapering to a long point
• Acute: pointed, having a short sharp apex angled less than 90°
• Aristate (aristata): Ending in a stiff, bristle-like point
• Asymmetrical: With the blade shape different on each side of the midrib
• Bipinnate (bipinnata): Each leaflet also pinnate
• Cauline: stem-shaped, needle-like
• Compound: Not simple; the leaf is broken up into separate leaflets, and the leaf blade is not continuous
• Cordate (cordata): Heart-shaped, with the petiole or stem attached to the cleft
• Cuneate (cuneata): Triangular, stem attaches to point
• Deltoid (deltoidea) or deltate: Triangular, stem attaches to side
• Digitate (digitata): Divided into finger-like lobes
• Elliptic (elliptica): Oval, with a short or no point
• Falcate (falcata): Sickle-shaped
• Filiform (filiformis): Thread- or filament-shaped
• Flabellate (flabellata): Semi-circular, or fan-like
• Hastate, spear-shaped (hastata): Pointed, with barbs, shaped like a spear point, with flaring pointed lobes at the base
• Laciniate: Very deeply lobed, the lobes being very drawn out, often making the leaf look somewhat like a branch
• Laminar: Flat (like most leaves)
• Lance-shaped, lanceolate (lanceolata): Long, wider in the middle
• Linear (linearis): Long and very narrow
• Lobed (lobata): With several points
• Mucronate: Ending abruptly in a sharp point^[1]
• Obcordate (obcordata): Heart-shaped, stem attaches to tapering point
• Oblanceolate (oblanceolata): Top wider than bottom
• Oblong (oblongus): Having an elongated form with slightly parallel sides
• Obovate (obovata): Teardrop-shaped, stem attaches to tapering point
• Obtuse (obtusus): With a blunt tip
• Orbicular (orbicularis): Circular
• Ovate (ovata): Oval, egg-shaped, with a tapering point
• Palmate (palmata): Consisting of leaflets^[2] or lobes^[3] radiating from the base of the leaf.
• Pedate (pedata): Palmate, with cleft lobes
• Peltate (peltata): Rounded, stem underneath
• Perfoliate (perfoliata): Stem through the leaves
• Pinnate (pinnata): Two rows of leaflets
  • Odd-pinnate, imparipinnate: Pinnate with a terminal leaflet
  • Paripinnate, even-pinnate: Pinnate lacking a terminal leaflet
  • Pinnatifid and pinnatipartite: Leaves with pinnate lobes that are not discrete, remaining sufficiently connected to each other that they are not separate leaflets.
  • Bipinnate, twice-pinnate: The leaflets are themselves pinnately-compound
  • Tripinnate, thrice-pinnate: The leaflets are themselves bipinnate
  • Tetrapinnate: The leaflets are themselves tripinnate.
• Pinnatisect (pinnatifida): Cut, but not to the midrib (it would be pinnate then)
• Pungent: Having hard, sharp points.
• Reniform (reniformis): Kidney-shaped
• Retuse: With a shallow notch in a broad apex
• Rhomboid (rhomboidalis): Diamond-shaped
• Round (rotundifolia): Circular
• Sagittate (sagittata): Arrowhead-shaped
• Simple: Leaf blade in one continuous section, not divided into leaflets (not compound)
• Spear-shaped: see Hastate.
• Spatulate, spathulate (spathulata): Spoon-shaped
• Subulate (subulata): Awl-shaped with a tapering point
• Subobtuse (subobtusa): Somewhat blunted, neither blunt nor sharp
• Sword-shaped (ensiformis): Long, thin, pointed
• Trifoliate (or trifoliolate), ternate (trifoliata): Divided into three leaflets
• Tripinnate (tripinnata): Pinnately compound in which each leaflet is itself bipinnate
• Truncate (truncata): With a squared off end
• Unifoliate (unifoliata): With a single leaf

See also

• Sinus (botany)

References

1. ^ Mucronate, Answers.com, from Roget's Thesaurus.
2. ^ "Cumulative Glossary for Vascular Plants". Flora of New South Wales. http://www.anbg.gov.au/glossary/fl-nsw.html. 
3. ^ "palmate (adj. palmately)". GardenWeb Glossary of Botanical Terms. http://glossary.gardenweb.com/glossary/palmate.html. 

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