Robert
W. Freckmann Herbarium
University of Wisconsin - Stevens Point
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Robert
W. Freckmann Herbarium
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Winter Key to Some Common Genera of Deciduous Woody Plants of the Upper Midwest
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Stipule scars present |
56 |
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55b. |
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Stipule scars absent |
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56a. |
Terminal bud present |
57 |
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56b. |
Terminal buds absent |
63 |
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57a. |
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Buds stalked |
58 |
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57b. |
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Buds sessile in leaf axils |
59 |
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58a |
Buds scurfy or sticky; pith triangular in cross-section; catkins or woody "cones" often present |
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58b. |
Buds densely short hairy, pith round in cross-section; no catkins |
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59a. |
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Buds without scales; embryonic leaves visible |
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59b. |
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Buds scales present |
60 |
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60a. |
Twigs smooth, shiny; catkins often present; bark often with wintergreen flavor |
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60b. |
Twigs shiny or dull; no catkins ; twigs with bitter almond taste or without taste |
61 |
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61a. |
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Low weak shrubs; last season's growth branched |
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61b. |
Trees or large shrubs; last season's growth not branched |
62 |
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62a |
Stipule scars slightly above leaf scars; lowermost bud-scale lateral; twigs sometimes bitter-almond taste | |
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62b. |
Stipule scars lateral; lowermost bud scale facing outward; linticels weak; buds sometimes sticky; twigs without flavor |
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Stipule scars encircling stems; leaf scars nearly encircling bud |
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63b. |
Stipule scars not encircling stem; leaf scar not encircling bud |
64 |
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64a. |
Buds naked, exposed embryonic leaves |
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64b. |
At least one bud scale present covering embryonic leaves |
65 |
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65a. |
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One hood-like bud scale with suture down inner side of bud; twigs often slender and flexible |
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65b. |
Two or more bud scales present |
66 |
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66a. |
Two or three visible bud scales |
67 |
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66b. |
Four to many bud scales |
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67a. |
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Accessory buds present above axillary buds; twigs coarsely striate; shrubs |
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| 67b. | No accessory buds normally present; twigs not striate; mostly trees | 68 | |
| 68a. | Buds reddish, broadly ovate; twigs zig-zag, lacking very prominent lenticels; no catkin | Tilia | |
| 68b. | Buds brownish, acute; twigs straight, with very prominent lenticels; catkins often present | Betula |
[Page 1, 2, 3, 4, -6, 7] Glossary drawings
