A biparous cyme ending in a uniparous cyme constitutes a Verticillaster.

Explanation:
A verticillaster is a type of inflorescence found in plants, characterized by a series of cymes arranged in a whorl-like fashion around the stem. It is commonly observed in the family Lamiaceae (mint family) and is a characteristic feature of plants such as basil, thyme, and lavender.

Let's break down the components of this inflorescence:

1. Biparous cyme:
- A cyme is a determinate inflorescence, where the terminal flower develops first and inhibits the growth of the lateral flowers.
- A biparous cyme refers to a cyme that branches into two equal branches at each node.
- In the case of a verticillaster, these branches arise in an opposite arrangement, meaning they occur in pairs at each node.

2. Uniparous cyme:
- A uniparous cyme is a type of cyme where each branch further branches into only one flower.
- In the case of a verticillaster, the biparous cyme ends in a uniparous cyme, meaning that each branch terminates with a single flower.

3. Verticillaster:
- The combination of a biparous cyme ending in a uniparous cyme constitutes a verticillaster.
- The arrangement of these cymes in a whorl-like fashion around the stem gives the inflorescence its characteristic appearance.

In summary, a biparous cyme ending in a uniparous cyme constitutes a verticillaster, which is a type of inflorescence found in plants of the Lamiaceae family. This inflorescence structure is commonly observed in plants such as basil, thyme, and lavender.

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