32 ARACEAE (ARUM FAMILY) 



THUJA (Arbor Vitae) 

 Leaves scale-like, opposite, and more or less two-ranked. 

 Monoecious. 



T, occidentalis. Arbor Vitae, White Cedar. Leaves in four rows 

 On the two-edged branchlets. Scales of the cones pointless. Swamps 

 and cool, rocky banks. A tree, 10-20 meters high, with pale, slireddy 

 bark, and light, soft, but very durable wood. 



JUNIPERUS (Juniper) 



Foliage not two-ranked. Dioecious. Fruit berry-like with bony, 

 ovate seeds. Evergreen. 



J. communis. Juniper. Catkins axillary. Leaves in whorls of three. 

 Prickly pointed, channeled and whitish above; thin and narrow, widely 

 spreading. Shrub two meters high or less. Dry soil. 



J. virginiana. Red Cedar. Catkins terminal. 

 Scale-like leaves opposite and entire. Berries 

 on straight peduncles. Ranges in form from 

 3; shrub to a tree fifteen to twenty-five meters 

 high, pyramidal in io^tm. Dry hills or deep 

 swamps, especially common in pastures. Bark 

 shreddy. Heart-wood red and aromatic. 

 Juniperus virginiana. Red 

 Cedar, li, pistillate twig; 



.;^iirflre;s:"j, ^.r SPARGANIACEAE (Bur-reed family) 



Hydrophytes with alternate, sessile, 

 linear, 2-ranked leaves; flowers monoecious and in globular in- 

 florescences. 



SPARGANIUM 



Inflorescences scattered along upper part of stem. Perennials 

 with fibrous roots and creeping horizontal rootstocks. Flowers 

 through the summer. The fertile heads become bur-like. 



S. eurycarpum. Bur-reed. Fertile flowers closely sessile. Fruit 

 broadly obovoid. Stems stout and erect. Style short, bearing i or 2 

 elongated stigmas. Borders of ponds, lakes, and rivers. Common. 



ARACEAE (Arum Family) 



Flowers crowded on a spadix which is usually surrounded by 

 a spathe. A large family, chiefly tropical. 



