Umbels can be determinate or indeterminate.Ī branched umbel, with primary rays arising from a common point, and secondary umbels arising from the tip of the primary rays.Ī dense vertically compressed inflorescence with sessile flowers on a receptacle and subtended by an involucre of phyllaries, characteristic of the Asteraceae. E.g.Northern Ontario Plant Database Inflorescence TypesĪn elongate, unbranched, indeterminate inflorescence with sessile flowers.Ī small spike, characteristic of grasses and sedges.Īn elongate, unbranched, indeterminate inflorescence with pedicelled flowers.Ī flat-topped raceme with elongate pedicels reaching the same level.Ī flat-topped or rounded inflorescence with the pedicels originating from a common point. The lateral branches may again branch similarly. Helicoid type in which each lateral branch bearing a terminal flower develops on the same side forming a helix as in Heliotropium.ĭichasial cyme: Here, two lateral branches develop on either side of the terminal flower.Scorpioid type in which the lateral branches of the axis bearing a terminal flower alternate as in Rananculus bulbosus.
![cyme and corymb cyme and corymb](https://f4.bcbits.com/img/a2463001912_10.jpg)
There are two types of monochasial cyme:.The main axis terminates into a flower and one lateral branch axis develops from its base which also ends in a flower.The main types of cymose inflorescence are:.They are usually stalked, and borne in a basipetal (growing downward towards the base or from the point of attachment) order.
![cyme and corymb cyme and corymb](https://www2.palomar.edu/users/warmstrong/images/inflor2.gif)
![cyme and corymb cyme and corymb](https://c8.alamy.com/comp/2AG3N6Y/field-and-woodland-plants-forjis-op-inflorescence-1-spike-3-corymb-5-cyme-2-kaceme-1-umbel-6-compound-raceme-or-panicle-7-capitulum-or-head-8-compound-umbel-it-is-often-convenient-to-make-use-of-certain-terms-to-denotethe-various-arrangements-of-flower-clusters-and-the-rincijal-ofthese-are-as-follows-1-spikesessile-flowers-arranged-along-a-common-axis-2-racemeflowers-stalked-along-a-common-axis-3-corymbflowers-stalked-along-a-common-axis-but-thelengths-of-the-pedicels-varying-in-such-a-manner-as-to-bring-all-theflowers-to-the-same-level-general-charactees-2AG3N6Y.jpg)
The main types of racemose inflorescence are:.It never terminates into a flower and bears flowers in acropetal (growing upward from the base or point of attachment).In this type of inflorescence, the main axis is unlimited in growth, branched or unbranched.Besides, there is also a special type of inflorescence which fits into none of these groups.It may be terminal or axillary in position.Inflorescence is the reproductive shoot, bearing a number of flowers.