340 



WEEDS AND USEFUL PLAXTS. 



4 anther-cells. Fertile aments with the scales imbricated, fixed by the 

 base, each bearing 2 erect ovules, dry and spreading at maturity. Co- 

 tyledons 2. Leaves evergreen, very short, appressed and imbricated on- 

 the flattened branches. 



1. T. OCCidenta'lis, L. Branches spreading ; leaves closely appressed, 

 rounded on the back ; cones ovoid-oblong, scales obtuse, pointless. 



Western Thuja. American Arbor-Yitae. 



stem 20-50 feet high, witti a conical top ; young ftrawTi^s 2-edged, diverging horizontally. 

 Cones half an inch long, in racemose clusters on the recurved hranchlets ; scales 1-seeded ; 

 seed broadly winged. 



New England and northwest. 



Ohs. This is a native of the cooler parts of the country and is fre- 

 quently cultivati^d as an ornamental evergreen. In the North it is 

 regarded as a valuable tree for its timber, which is very durable, though 

 difficult to procure of any great length. 



2. T. orienta'lis, L. Branches erect ; leaves slightly sulcate in the 

 middle ; cones roundish-ovoid or obovoid, erect ; scales acute with con- 

 spicuous recurved or spreading points. 



Eastern Thuja. Chinese Arbor-Yitse. 



stem 10-20 feet high, usually of a shrub-like habit, with numerous erect branches from 

 near the base — especially when young ; branches diverging vertically or fan-like, with the 

 edges up and down. Cones sub-solitary, about half an inch long, deep green and glaucous. 



Cultivated. Native of China and Japan. 



Ohs. This is a much smaller tree than the preceding, its foliage and 

 cones of much deeper green. It is often used for an ornamental hedge ; 

 and it is decidedly better for show than for service. 



5. CUPRES'SUS, Tournef. Cypress. 



[The classical name .] 



Flowers monoecious on different branches, in terminal small aments. 

 Sterile aments of shield-shaped scales bearing 2-4 anther-cells under 

 the lower margin. Fertile aments globular, of shield-shaped scales in 

 4 ranks, bearing several erect bottle-shaped ovules. Cones globular, 

 firmly closed, but opening at maturity ; the scales thick and woody, 

 pointed in the middle ; the few or several narrowly-winged seeds at- 

 tached to their base or stalk. Cotyledons 2 - ^. Strong-scented ever- 

 green trees, with very small and scale-like closely appressed imbricated 

 leaves and exceedingly durable wood. 



1. C, thyoi'des, L. Leaves minute, ovate, with a small gland on the 

 back, closely imbricated in 4 rows on the 2-edged branchlets. 



Thuja-like Cupressus. "White Cedar. 



