Abstract
THE arum family (Araceae) is well represented in tropical parts of the world, and, in India, genera like Colocasia, Alocasia, Typhonium, Amorphophallus and Pothos belonging to this family are commonly found. Some of these genera are associated with the hydrophytes and others form constituent plants of the secondary vegetation of the ‘terai’ forests or the foothill vegetation of the Himalayas. The ‘terai should be regarded ecologically as the real tropical rain forest. The arum family as a whole, therefore, comprises plants which are not found in high altitudes in India in places like Simla, Darjeeling or Sikkim. We are apt to think of plants like lofty Magnolias, Cedrus, Quercus, Rhododendrons and other plants like Primulas, Gentiana and Senecioswhen we imagine the vegetation at high altitudes in the Himalayas. An exception to this is the interesting and fascinating genus Arisœma belonging to the arum family. The species of this genus are always found in high hills and some reach altitudes of 15,000 ft. (5,000 m.) in the Sikkim Himalayas.
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