describe briefly racemose and cymose inflorescence
Answers
Explanation:
Racemose and cymose are two types of inflorescence, i.e. arrangement of flowers around the main axis. In racemose, the main axis continues to grow indefinitely and the flowers are borne laterally. In cymose inflorescence, flowers are borne terminally on the floral axis and shows determinate growth of the main axis.
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Answer:
Explanation:
Racemose Inflorescences:
Raceme:
A racemose inflorescence, it continues to produce lateral stalked or pedicellate flowers in acropetal order along its main axis. Example: The mustard plant Crotolaria (B. Atasi, A). A panicle is a type of compound raceme, such as Peltophorum, in which the rachis is branching and the branches are bearing the pedicellate flowers racemosely.
Spike: It looks exactly like a jaceme but has sessile blooms, such as Achyranthes (B. Apang) and tube-rose.
Spadix:
It is a type of spike with a fleshy axis and sessile blooms that stays enclosed in the spathe, a bract with the appearance of a coloured boat. Arum bananas are common examples. Spadixes on palms are branching.
Catkin: A spike with a long, pendulous axis that solely bears unisexual blooms, such as Mulberry, is referred to as a catkin (B. Toonth).
Corymb:
It is a racemose inflorescence with a relatively short main axis and older blooms with longer stalks than the younger flowers, which raises all of them roughly to the same level. Example: Iberis
Umbel:
The inflorescence takes on the appearance of an umbrella because the main axis is relatively short and a number of flowers with equal-length pedicels grow from a point, as in the case of Hydrocotyle (B. Thulkuri). The base of the pedicels is where bracts frequently form. Coriander (B. Dhoney, ). Compound umbels can be seen in plants like anise (B. Mouri).
Capitulum:
In this instance, the rachis is drastically cut down to create a flat, concave body known as the receptacle. On the receptacle, there are several sessile flowers arranged in centripetal order.
The florets often come in two varieties: ray florets around the outside and disc florets in the middle. The florets have tiny, scaly bracts, and an involucre of bracts surrounds the entire inflorescence.
It is an inflorescence, despite the fact that it appears to be a single flower. Common examples are sunflowers, marigolds, dahlias, and other sunflower family plants.
Cymose Inflorescence:
The main axis of the cymose inflorescence is finished by the development of a flower. The lateral axes that bear one or more of the younger blooms begin below the terminal one. Oldest at the tip and younger ones farther from it, the arrangement is basipetal. Therefore, the method of flower opening used here is centrifugal (from centre towards circumference).
Cymose inflorescences can be
- uniparous
- biparous
- multiparous, depending on the branches that have grown.
Only one lateral branch is formed below in a uniparous or monochasial cyme, either on the same side as the branch bearing it, as in the case of Hamelia, or on opposing sides in a zigzag pattern, as in the case of Heliotropium (B. Hatisoor). Two lateral branches are consistently generated in a dichasial or biparous cyme.
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