THIS card index will be useful to those interested in hardy shrubs and trees, though it is difficult to see that it has any advantage over the available books as a reference work. Certain blank spaces on the cards are said to be an invitation to the user to add his own observations and sketches; if used in this way there is no doubt that much benefit would accrue to the user, and in this case the card index scheme admits of profitable expansion of the record. Notes on the cards refer to habitat; form; colour; bark; season of foliage; flower and fruit; ’cleanliness’ (that is, susceptibility to pest and disease); pruning; aspect and value.
Useful Trees and Shrubs:
Being a Card File of Data on approximately 500 Hardy Woody Plants in Common Use as Ornamentals. Compiled and prepared by Prof. Florence Bell Robinson. 494 Cards. 6 in. × 4 in. (Champaign, Ill.: The Garrard Press, 1938.) 4.50 dollars.
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Useful Trees and Shrubs. Nature 143, 266 (1939). https://doi.org/10.1038/143266e0