Major eastern shade-intolerant broad-leaved species

Prunus pensylvanica L.f. - pin cherry

Image 1. Inflorescences (flower buds and their pedicels evident) emerging from overwintered lateral buds, mid-May.

Image 2. Flowers in full bloom, their five petals extended, stamens prominent, and stigmas and styles evident, late May.

Image 3. Flowers in bloom from a group of inflorescences, leaves expanding, late May.

Image 4. Fruits (drupes) developing at ends of extended pedicels of infructescences (umbel-like or short racemes), from the bases of which associated bracts and bud scales have been shed,mid-June.

Image 5. Ripe drupes in 1- to 6-fruited infructescences that are, here, clearly, short racemes, mid- to late July.

Image 6. First-year seedling, showing the pair of oval cotyledons and neoformed leaves developing along the extending shoot (epicotyledonary axis or main stem), early June.

Image 7. The upper crown of a vigorously growing sapling in mid-October, showing prominent sylleptic branches along the middle section of the leader, and late-season retention of many of the neoformed leaves near the ends of all shoots.

Image 8. Many sapling-sized pin cherry showing black knot fungal infection on many branches, mid-July.

Some intolerant hardwoods in stand situations

Image 9. Grey birch and white birch (note differences in branching patterns), trembling aspen, with red maple (Acer rubrum L.), and associated coniferous understory.

Image 10. Trembling aspen, white birch, and red maple with coniferous understory.

Image 11. A dense, young stand of essentially white birch in early September after aerial application of herbicide in mid-summer of 1966, growing over a coniferous understory.

Information provided by:
Dr. G.R. Powell
Faculty of Forestry and Environmental Management at UNB