Robert W. Freckmann Herbarium

Taxonomy of Vascular Plants

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Vascular Plants

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

Glossary drawings

69a.

 

Twigs glandular, resinous, aromatic, with staminate catkins at tips; shrubs

Myrica

69b.

 

Twigs not glandular; mostly trees

70

 

70a.

Bud tips appressed; pith mostly chambered

Celtis

 

70b.

Bud tips spreading; pith not chambered

71

71a.

 

Bud scales in two vertical rows; floral buds distinctly larger and rounder than foliage buds; no catkins

Ulmus

71b.

 

Bud scales not in two rows; buds fairly uniform in size; catkins often present

72

 

72a.

Leaf scars in essentially two ranks; staminate catkins present; twigs tasteless or with wintergreen taste

73

 

72b.

Leaf scars in several ranks; no catkins present; twigs often with bitter almond (cyanide) taste

Prunus

73a.

 

Lenticels prominent and elongate; numerous short spur shoots on older growth; bark often with wintergreen taste

Betula

73b.

 

Lenticels not very prominent and elongate; spur shoots rare; no wintergreen flavor

74

 

74a.

Buds mostly 4-7 mm. long, rounded in cross-section; staminate catkin usually present

Ostrya

 

74b.

Buds mostly 2-4 mm. long, foru-sided; staminate catkins absent

Carpinus

75a.

 

Terminal bud present

76

75b.

 

Terminal bud absent

83

 

76a.

Pith chambered; twigs stout

Juglans

 

76b.

Pith continuous, not chambered

77

77a.

 

More than 3 bundle scars

78

77b.

 

Three bundle scars

79

 

78a.

Buds usually yellow or brownish; petiole bases not persisting; vines or shrubs

Toxicodendron

 

78b.

Buds dark red; petiole bases often persisting; trees or shrubs

Pyrus

79a.

 

Leaf scars nearly semi-circular

80

79b.

 

Leaf scars narrowly U-shaped or less than 2mm. in diameter

81

 

80a.

Bud scales finely hairy, lowermost scale facing outward

Populus

 

80b.

Bud scales smooth; lowermost scales lateral

Prunus

81a.

 

Internodes very unequal; twigs yellowish-green

Cornus

81b.   Internodes fairly equal; twigs grayish, brownish, etc. 82
  82a. Axillary buds much elongate, pointed; bark smooth, not resinous Ribes
  82b. Axillary buds ovate or rounded; twigs resinous, glandular Myrica

 [Page 1, 2, 3, 4, 5 -7] Glossary drawings


         
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