The winter twigs of northern catalpa are like those of few other trees, having sunken leaf scars that resemble suction cups.
12.
The trunk is cylindrical, smooth, light colored, covered with wax; leaf scars forming dark rings around the trunk.
13.
Light and dark concentric circles of narcotic tissue characterize this symptom, occurring near buds killed by cold or on leaf scars.
14.
The n + kau grows up to 15 m tall, with a stout, green trunk which bears grey-green leaf scars.
15.
The twigs are slender to moderately stout, brown with deep U-shaped leaf scars, and with short, light brown, fuzzy buds.
16.
It also can enter through short, dead pruning stubs, leaf scars, winter-killed buds on small twigs, and on poorly healed pruning cuts.
17.
The leaves are fan-shaped ( " costapalmate " ) and the trunk columnar, naked, smooth or fibrous, longitudinally grooved, and obscurely ringed by leaf scars.
18.
The closely packed diamond-shaped leaf scars left on the trunk and stems as the plant grew provide some of the most interesting and common fossils in Carboniferous shales and accompanying coal deposits.
19.
As a result, vulnerable tissues are at risk of initial invasion throughout most parts of the year, although it most commonly occurs in autumn and spring following winter injury and leaf scars.
20.
Also known as the New Guinea Palmyra palm, " B . heineanus " grows up to 20 m tall with a robust trunk ringed with leaf scars; the old leaves remain attached to the trunk, but eventually fall cleanly.
