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Winter Key to Some Common Genera of Deciduous Woody Plants of the Upper Midwest
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40a. |
Stipules persistent, although sometimes tiny |
41 |
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40b. |
Stipules represented by elongate scars only |
42 |
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41a. |
Stipules conspicuous, encircling stem; bark brown, shredding; small shrub |
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41b. |
Stipules tiny, not sheathing stem; large shrub or small tree |
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42a. |
Accessory buds above axillary buds |
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42b. |
Axillary buds only |
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43a. |
Terminal bud present |
44 |
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43b. |
Terminal bud absent |
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44a. |
Leaf scars very rough and uneven; bark bronze brown |
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44b. |
Leaf scars even and nearly smooth; older bark smooth gray with white shedding crust |
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45a. |
Bundle scars more than 3, not in a crescent shaped line |
46 |
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45b. |
Bundle scars 3 or sometimes more, in a single crescent shaped line |
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46a. |
Buds crowed near tip of twig |
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| 46b. | Buds not crowded near tip | 47 | |
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47a. |
Stipule scars present |
48 |
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47b. |
Stipule scars absent |
53 |
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48a. |
Terminal bud present |
49 |
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48b. |
Terminal bud absent |
51 |
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49a. |
Bud scales overlapping; buds narrow, acute, twigs slender |
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49b. |
One or two cuplike scales over terminal bud, buds large, blunt; twigs stout |
50 |
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50a. |
Terminal bud with one scale, not flattened; leaf scars U-shaped |
Magnolia |
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50b. |
Terminal bud with 2 scales, flattened; leaf scars circular |
Liriodendron |
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51a. |
2 visible bud scales; buds smooth, reddish; twigs smooth, reddish or greenish gray; no catkins |
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51b. |
4 or more visible bud scales; buds and twigs grayish; sometimes with catkins |
52 |
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| 52a. | Buds oval and spreading; tall shrubs | Corylus | |
| 52b. | Buds triangular and appressed; trees | Morus | |
| 53a. | Twigs relatively slender, with strong odor when crushed; buds covered with yellow hairs, partially hidden under leaf scar | Rhus | |
| 53b. | Twigs stout, not aromatic when crushed; buds large, conspicuous | 54 | |
| 54a. | Bark of twigs yellowish-brown, mottled; shrub | Toxicodendron | |
| 54b. | Bark of twigs grayish; trees; with either large terminal bud and overlapping scales, or yellowish with scales meeting laterally | Carya |
[Page 1, 2, 3,- 5, 6, 7] Glossary drawings
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