Theophrastus,
Enquiry into Plants — Volume 1
(1916)
“ Introductory: How plants are to be classified; difficulty of defining what are the essential parts of a plant, especially if plants are assumed to correspond to animals 3 The essential parts of plants, and the materials of which they are made 9 Definitions of the various classes into which plants may be divided 23 Exact classification impracticable: other possible bases of classification 27 Differences as to appearance and habitat 29 Characteristic differences in the parts of plants, whether general, special, or seen in qualities and properties 33 ”
