| Spike |
an elongate, unbranched, indeterminate inflorescence with sessile flowers. |
| Spikelet |
a small spike, characteristic of grasses and sedges. |
| Raceme |
an elongate, unbranched, indeterminate inflorescence with pedicelled flowers. |
| Panicle |
a branched raceme. |
| Corymb |
a flat-topped raceme with elongate pedicels reaching the same level. |
| Ccompound Corymb |
a branched corymb. |
| Umbel |
a flat-topped or rounded inflorescence with the pedicels originating from a common point. Umbels can be determinate or indeterminate. |
| Compound Umbel |
a branched umbel, with primary rays arising from a common point, and secondary umbels arising from the tip of the primary rays. |
Capitulum
(or head) |
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 |
a many-flowered inflorescence with an indeterminate central axis and many opposite, lateral dichasia; a mixed inflorescence, with determinate and indeterminate shoots. |
