Q. 103] 



CLASSIFICATION AND DESCRIFHON 



193 



scale-shaped, overlapping, mostly appressed, with generally an acute 

 apex, light green in color. Cones oval, 2 to 3 in. long, of about 25 

 scales. The largest tree known, 300 ft. high, with a trunk nearly 

 30 ft. through, found in California and occasionally planted east, 

 though with no great success, as it is 

 almost certain to die after a few years. 



2. Sequ6ia semp6rvirens, Endl. 

 (REDWOOD.) Leaves from % to I in. 

 long, linear, smooth, 2-ranked, flat, 

 acute, dark shining green, glaucous be- 

 neath; branches numerous, horizontal, 

 spreading. Cones 1 in. long, roundish, 

 solitary, terminal; scales numerous, 

 thick, rough, furnished with an obtuse 

 point. A magnificent tree from Cali- 

 fornia, where it grows 200 to 300 ft. 

 high. In the East it can be kept alive 

 but a few years even at Washington. 



GENUS 103. THtTYA. ( ARBOR- VIT.E.) 



Small, evergreen trees with flat, 2-ranked, fan-like spray 

 and closely overlapping, small, appressed leaves of two 

 shapes on different brauchlets, one awl-shaped and acute, 

 the other scale-like, usually blunt and close to the branch. 

 Fertile catkins of few, overlapping scales fixed by the 

 base; at maturity, dry and spreading. There are scores 

 of named varieties of Arbor-vitaB sold by the nurserymen 

 under 3 different generic names, Thuya, Biota, and Thu- 

 yopsis. There are but slight differences in these groups, 

 and they will in this work be placed together under 

 Thuya. Some that in popular language might well be 

 called Arbor-vitae (the Retinosporas) will, because of the 

 character of the fruit, be included in the next genus. 



* Scales of the cones pointless, thin, straight. (Thuya) 1, 2. 



* Scales reflexed and wedge-shaped. (Thuyopsis) 3. 



* Scales thick, with horn-like tips. (Biota) 4. 



UK 



