what are capitulum , umbel , umbel of umbels , corymb , verticillaster , hypanthodium , cyathium , dichasial chyme?

(a) Capitulum, is a type racemose inflorescence, in which a large number of sessile small flowers are attached to a common receptacle, known as head. These small flowers are known as florets. The florets are of two types, namely ray florets and disc florets.

(b) ​Umbel is a type of inflorescence that consist of many small flowers with stalks (called pedicels). All these small flowers come out of a common point, just like ribs of an umbrella. Pedicels are of nearly same length, forming a flat topped or convex umbel.

(c) ​Compound umbel is known as umbel of umbels and is characteristic of family Apiaceae, also known as Umbelliferae. In compound umbel instead of single flower many small umbels are present. These are known as umbellets. These umbellets are attached to the main floral stem by the help of a stalk like structure called ray. It means, instead of spreading out of a single flower from a common stem, many inflorescence branches arise, that carry secondary umbels at their ends. For example Daucus carota (wild carrot).

(d) ​ A Corymb is flat-topped clusters of flowers in which the individual flower stalks grow in upward direction from various points of the main stem to the same height.

(e) ​Verticillaster is a cymose type of inflorescence arranged in pairs at the nodes, like a false whorl. For example, Ocimum.  

(f) In hypanthodium inflorescence, the receptacle becomes spherical with a cavity inside.

(g) ​Cyathium inflorescence is the characteristic of the family Euphorbiaceae. Cyathium consist of a pistillate flower, surrounded by cymes of staminate flower, enclosed in a cup like structure called, involucre. Pistillate flower are those having only carpels ( female flower) and staminate flower are those having only stamens ( male flower). Involucre is formed by five rarely four small united bracts called bracteoles

(h) In dichasial cyme inflorescence, a flower and two lateral branches arise from peduncle. Each branch in turn ends into a flower.


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