This may be described as a panicle of spikelets. In wheat, the multi-flowered spikelets are borne on an unbranched axis looking like a compound spike. 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 a corymb the axis is not elongated to the same extent as in the previous inflorescences. 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. This is seen in different species of Cassia. Young inflorescences of mustard look corymbose while they become racemes when mature. Similarly, the umbel inflorescence of cherry (Pnams cerasus) may become a corymb when mature. 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. The umbel differs from the corymb in that the axis is shortened further -almost to nil. The flowers (usually having stalks equal in length) then appear to form a cluster.
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