#Scorpioid cyme inflorescence series

This is also a modification of spike inflorescence having a fleshy axis, which remains enclosed by one or more large, often brightly coloured bracts, the spathes, e.g., in members of Araceae, Musaceae and Palmaceae. This is a modified spike with a long and drooping axis bearing unisexual flowers, e.g., mulberry (Moras alba), birch (Betula spp.), oak (Quercus spp.), etc. Spikeletes are characteristic of Poaceae (Gramineae) or Grass family, e.g., grasses, wheat, barley, oats, sorghum, sugarcane, bamboo, etc. Flowers and glumes are arranged on the spikelet in two opposite rows. The palea (also known as superior palea) often with two longitudinal ridges (keels or nerves), stands between the lemma and the rachilla. The floral parts borne in the axil of lemma. Usually the lemma also known as inferior palea bears a long awn as an extension of the mid-rib at the apex or back. The lemma is the lower, outer bract of the floret.

#Scorpioid cyme inflorescence series

Just above the glumes, there is series of florets, partly enclosed by them.Д®ach floret has at its base a lemma and palea. The usual structure of spikelet is as- There is a pair of sterile glumes at the base of spikelet, the lower, outer glume called the first, and the upper, inner one called the second. 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.Д®ach 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. (iii) With the main axis flattened, i.e., capitulum or head. (ii) With the main axis shortened, i.e., (i) corymb and (ii) umbel. (i) With the main axis elongated, i.e., (a) raceme (b) spike (c) spikelets (d) catkin and (e) spadix. The various forms of racemose inflorescence may be described under three heads. In this type of inflorescence the main axis does not end in a flower, but it grows continuously and develops flowers on its lateral sides in acropetal succession (i.e., the lower or outer flowers are older than the upper or inner ones).