Robert W. Freckmann Herbarium

Taxonomy of Vascular Plants

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Plants of Wisconsin

Vascular Plants

Winter Key to Some Common Genera of Deciduous Woody Plants of the Upper Midwest

Glossary drawings

55a.

 

Stipule scars present

56

55b.

 

Stipule scars absent

75

 

56a.

Terminal bud present

57

 

56b.

Terminal buds absent

63

57a.

 

Buds stalked

58

57b.

 

Buds sessile in leaf axils

59

 

58a

Buds scurfy or sticky; pith triangular in cross-section; catkins or woody "cones" often present

Alnus

 

58b.

Buds densely short hairy, pith round in cross-section; no catkins

Hamamelis

59a.

 

Buds without scales; embryonic leaves visible

Rhamnus

59b.

 

Buds scales present

60

 

60a.

Twigs smooth, shiny; catkins often present; bark often with wintergreen flavor

Betula

 

60b.

Twigs shiny or dull; no catkins ; twigs with bitter almond taste or without taste

61

61a.

 

Low weak shrubs; last season's growth branched

Ceanothus

61b.

 

Trees or large shrubs; last season's growth not branched

62

 

62a

Stipule scars slightly above leaf scars; lowermost bud-scale lateral; twigs sometimes bitter-almond taste

Prunus

 

62b.

Stipule scars lateral; lowermost bud scale facing outward; linticels weak; buds sometimes sticky; twigs without flavor

Populus

63a.

 

Stipule scars encircling stems; leaf scars nearly encircling bud

Platanus

63b.

 

Stipule scars not encircling stem; leaf scar not encircling bud

64

 

64a.

Buds naked, exposed embryonic leaves

Rhamnus

 

64b.

At least one bud scale present covering embryonic leaves

65

65a.

 

One hood-like bud scale with suture down inner side of bud; twigs often slender and flexible

Salix

65b.

 

Two or more bud scales present

66

 

66a.

Two or three visible bud scales

67

 

66b.

Four to many bud scales

69

67a.

 

Accessory buds present above axillary buds; twigs coarsely striate; shrubs

Amorpha

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


         
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