Cressa is a genus of plants in the morning glory family known generally as alkaliweeds. These plants are native to the tropical and subtropical areas of the world. They are clumpy and low-growing but usually have erect stems covered white-haired, green leaves. They produce tiny white flowers about half a centimeter across.

There are four species recognised in the genus Cressa:

• Cressa australis
• Cressa cretica
• Cressa nudicaulis
• Cressa truxillensis

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