The letter 'x' is often used to indicate the basic chromosome number of a plant or species (e.g., x = 7). That is, 'x' is the number of chromosomes in a monoploid, or a single gamete. Assume x = 7; then 2x = 14, and is a fertile diploid ; 3x = 21, and is a sterile triploid; 4x = 28 and is a tetraploid which will be fully fertile if it is an allotetraploid ; 5x = 35 and is a sterile pentaploid; and 6x = 42 and is a hexaploid that is likely to be sterile. Xanthomonas

A genus of gram-negative bacteria that cause bacterial blights in beans, soybeans, cotton, rice, stone fruits, tomato, pepper, sugarcane, and various ornamentals. Xanthosoma sagittifolium.

Tannia, tannier, yautia, cocoyam. A typical aroid that differs from Colocasia in having sagittate leaves (i.e., leaves shaped like an arrow with an arrow-head), and in that it originated in the New World. Xerophyte

A plant able to withstand drought.

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