Spike

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an elongate, unbranched, indeterminate inflorescence with sessile flowers

Spikelet

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a small spike, characteristic of grasses and sedges

Raceme

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an elongate, unbranched, indeterminate inflorescence with pedicelled flowers

Panicle

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a branched raceme

Corymb

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a flat-topped raceme with elongate pedicels reaching the same level

Compound Corymb

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a branched corymb

Umbel

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a flat-topped or rounded inflorescence with the pedicels originating from a common point; can be determinate or indeterminate

Compound Umbel

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 branched umbel, with primary rays arising from a common point, and secondary umbels arising from the tip of the primary rays

Capitulum/Head

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a dense vertically compressed inflorescence with sessile flowers on a receptacle and subtended by an involucre of phyllaries, characteristic of the Asteraceae; heads can be determinate or indeterminate

Thyrse

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a many-flowered inflorescence with an indeterminate central axis and many opposite, lateral dichasia; a mixed inflorescence, with determinate and indeterminate shoots