Cyme or panicle7/31/2023 Some are in compound spikes (i.e., in wheat-Triticum aestivum), others are in racemes (e.g., in Festuca), while some are in panicles (e.g., in Avena). Spikeletes are arranged in a spike inflorescence which is composed of several to many spikelets which are combined in various manners on a main axis called the rachis. In this type of racemose inflorescence the main axis remains elongated and the lower flowers are older, i.e., opening earlier than the upper ones, as found in raceme, but here the flowers are sessile, i.e., without pedicel or stalk, e.g., amaranth (Amaranthus spp.), latjira (Achyranthes aspera), etc.Įach spikelet may bear one to several flowers (florets) attached to a central stalk known as rachilla. The stalk of the individual flower of the inflorescence is called the pedicel. The main axis of the inflorescence together with the latest axes, if present, is termed as the peduncle. When the main axis of raceme is branched and the lateral branches bear the flowers, the inflorescence is known as compound raceme or panicle, e.g., neem (Azadirachta indica), gul-mohar (Delonix regia), etc. The lower or older flowers possess longer stalks than the upper or younger ones, e.g., radish (Raphanus sativus), mustard (Brassica campestris), etc. In such cases the main axis remains elongated and it bears laterally a number of stalked flowers.
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