I here quote several notes from Bell's Chaucer, marked 'Bell.'
'The reader will observe the life and spirit which the personification of the several trees gives to this catalogue. It is common in French, even in prose; as, for instance, the weeping willow is le saule pleureur, the weeper willow. The oak is called builder, because no other wood was used in building in this country in the middle ages, as may be seen in our old churches and farm-houses, in which the stairs are often made of solid blocks of the finest oak.'—Bell.
177. 'The elm is called piler, perhaps because it is planted as a pillar of support to the vine [cf. Spenser's 'vine-prop elme']; and cofre unto careyne because coffins for carrion or corpses were [and are] usually made of elm.'—Bell. In fact, Ovid has 'amictae uitibus ulmi,' Met. x. 100; Claudian has 'pampinus induit ulmos'; and Boccaccio—'E l'olmo, che di viti s'innamora'; Tes. xi. 24.
178. Piper, suitable for pipes or horns. 'The box, being a hard, fine-grained wood, was used for making pipes or horns, as in the Nonne Prestes Tale, B 4588—"Of bras they broghten bemes [trumpets] and of box."'—Bell. Boxwood is still used for flutes and flageolets.
Holm to whippes lasshe; 'the holm used for making handles for whip-lashes.'—Bell. Spenser calls it 'The carver holm,' i. e. the holm suitable for carving. It is the holly (A. S. holegn), not the holm-oak.
179. The sayling firr; this 'alludes to the ship's masts and spars being made of fir.'—Bell. 'Apta fretis abies'; Claudian, De Raptu Proserpinae, ii. 107. Spenser substitutes for it 'The sailing pine.' The cipres; 'tumulos tectura cupressus,' in Claudian.
180. The sheter ew. 'The material of our [ancient] national weapon, the bow, was yew. It is said that the old yews which are found in country churchyards were planted in order to supply the yeomanry with bows.'—Bell. Spenser has—'The eugh, obedient to the benders will.'
'The asp is the aspen, or black poplar, of which shafts or arrows were made.'—Bell. Spenser has—'The aspine good for staves'; and 'The birch for shaftes.' See Ascham's Toxophilus, ed. Arber, p. 126.
181. The olive is the emblem of peace; and the palm, of victory. Boccaccio has—'e d'ogni vincitore Premio la palma'; Tes. xi. 24; from Ovid—'uictoris praemia palmae'; Met. x. 102.
182. 'The laurel (used) for divination,' or 'to divine with.' 'Venturi praescia laurus'; Claudian, de Raptu Proserpinae, ii. 109. It was 'sacred to Apollo; and its branches were the decoration of poets, and of the flamens. The leaves, when eaten, were said to impart the power of prophesying; Tibull. 2. 5. 63; Juvenal, 7. 19.'—Lewis and Short's Lat. Dict., s.v. laurus.