Elliptic
With widest axis at midpoint of structure and with margins symmetrically curved |
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| narrowly elliptic |
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| elliptic |
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| widely elliptic |
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| circular |
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| oblate |
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| transversely elliptic |
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| narrowly transversely elliptic |
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Oblong
With widest axis at midpoint of structure and with margins essentially parallel |
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| linear |
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| narrowly oblong or ovate |
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| oblong |
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| widely oblong |
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| square |
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| transversely widely oblong |
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| transversely oblong |
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| narrowly transversely oblong |
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| transversely linear |
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Ovate
With widest axis below middle and with margins symmetrically curved; egg-shaped |
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| lanceolate |
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| ovate |
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| widely ovate |
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| very widely ovate |
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| widely depressed ovate |
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| depressed ovate |
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Obovate
Inversely ovate |
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| oblanceolate |
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| obovate |
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| widely obovate |
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| very widely obovate |
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| widely depressed obovate |
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| depressed obovate |
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Rhombic
With widest axis at midpoint of structure, and with straight margins; elliptic but margins straight and middle angled |
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| narrowly rhombic |
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| rhombic |
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| widely rhombic |
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| quadrate rhombic |
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| widely transversely rhombic |
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| transversely rhombic |
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| narrowly transversely rhombic |
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Trullate
With widest axis below middle and with straight margins; ovate but margins straight and angled below middle, trowel-shaped |
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| narrowly trullate |
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| trullate |
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| widely trullate |
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| very widely trullate |
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| widely depressed trullate |
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| transversely depressed trullate |
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Obtrullate
Inversely trullate |
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| narrowly obtrullate |
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| obtrullate |
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| widely obtrullate |
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| very widely obtrullate |
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| widely depressed obtrullate |
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| transversely depressed obtrullate |
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Triangular
With three sides and three angles |
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| linear triangular |
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| narrowly triangular |
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| triangular |
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| widely deltate |
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| deltate |
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| shallowly deltate |
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| shallowly triangular |
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| very shallowly triangular |
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Obtriangular
Inversely triangular |
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| linear obtriangular or narrowly cuneate |
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| cuneate |
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| obtriangular or widely cuneate |
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| widely obdeltate |
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| obdeltate |
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| shallowly obdeltate |
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| shallowly obtriangular |
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| very shallowly obtriangular |
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