Fruit and Twig Key to Trees and Shrubs

by William H. Harlow

One of the handiest and most widely used identification aids. Fruit key covers 120 deciduous and evergreen species; twig key covers 160 deciduous species. Easily used. Over 300 photographs. "Students in the field . . . can get accurate identifications faster with these guides than with any of the many teacher's mimeographed ones." — Phytologia.