CALIDÆ PLANTÆ, (from calor heat): plants that are natives of warm climates. Such are those of the East Indies, South America, Egypt, and the Canary Islands. These plants, says Linnæus, will bear a degree of heat which is as 40 on a scale in which the freezing point is 0, and 100 the heat of boiling water. In the 10th degree of cold they cease to grow, lose their leaves, become barren, are suffocated, and perish.