The flowers (usually having stalks equal in length) then appear to form a cluster. The umbel differs from the corymb in that the axis is shortened further -almost to nil. When the main axis branches and the flowers are arranged on the branches in a corymbose manner, the inflorescence is a compound corymb as seen in Pyrus torminalis. Similarly, the umbel inflorescence of cherry (Pnams cerasus) may become a corymb when mature. Young inflorescences of mustard look corymbose while they become racemes when mature. ![]() This is seen in different species of Cassia. Moreover, the stalks of the flowers are longer and longer as the flower is placed lower and lower on the axis so that all the flowers are placed almost at the same level. In a corymb the axis is not elongated to the same extent as in the previous inflorescences. In maize the male inflorescence bears the paired spikelets in a ‘panicle’ while the paired female spikelets (the lower one of each pair being sterile) are arranged in a ‘spadix’. In wheat, the multi-flowered spikelets are borne on an unbranched axis looking like a compound spike. This may be described as a panicle of spikelets. In rice, each spikelet is composed of one flower only and the whole inflorescence is branched like a panicle although different from a true panicle. ![]() The ultimate inflorescences formed by the spikelets are complex and compound.
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