KEY FOR THE IDENTIFICATION OF TREES AND SHRUBS 



OF NANTUCKET 



A. Trees: Woody plants, usually with a single tall stem 

 and a crown of branches 1 



A. Shrubs: Woody plants, usually with several stems 



forming a fairly low, bushy cluster 67 



1. Leaves slwple: undivided, with margin entire, 



toothed or lobed but not cut to the midrib .... 2 

 1. Leaves compound: divided to the midrib or to the 



leaf stalk into distinct parts: leaflets 43 



2. Leaf with expanded surface 3 



2. Leaf reduced to needle or scale.' 56 



3 • Free- forking veins in a fan-shaped leaf: a 

 primitive type found only rarely on Nantucket 



Maidenhair Tree 

 Glnkio bl loba L. 

 3- Netted veins: the small veins connected by 



cross veins into a mesh throughout the leaf. . 4 

 4. Leaves set by threes on the twig: 

 whorl ed Catalpa 



Catalpa blinonloldes Walt . 

 4. Leaves set by twos on the twig: opposite. . 5 

 4. Leaves set by ones on the twig: alternate . 10 

 5. Primary veins several, radiating from 

 the base of the expanded leaf portion: 

 the blade: palmately veined 



Genus Acer 6 



5- Primary vein one with secondary veins 



arising along it: pi nnate ly veined. ... 9 

 6. Lobes radiating in star-like pattern . . 7 

 6. Three main lobes forward-pointing. ... 8 

 7- Leaf smooth, dark green, 7-lobed, 

 milky sap . . . Norway Maple 



Acer Platanoldes L- 

 7 -Leaf smooth, ^dark green, 5-lobed, 

 watery sap. . . Sugar Maple 



Acer saccharum Marsh. 

 7 -Upper leaf surface furrowed by veins, 

 5 widely spreading lobes 



Sycamore Maple 



Acer pseudoplatanus L. 



41 



