362 KETINOSPORA. 



Gen. RETINOSPOBA* Siebold. 



Flowers monoecious, or male and female on the same plant, 

 but separate, and terminal, the males cylindrical, females soli- 

 tary, very small, and on the same branchlets as the males. 



Cones very small, globular, ligneous, and solitary. 



Scales ovate, in alternate cross pairs, ten or twelve in num- 

 ber, wedge-shaped at the base, peltated on the top, and woody. 



Seeds in channels, coated with resin, and two at the base of 

 each scale, with lateral membranaceous wing, marked with 

 resinous bands. 



Leaves persistent, in threes, or opposite pairs, linear, or 

 scale-formed, and mostly spreading. 



Seed-leaves in twos. 



Name derived from "rhetine/' resin, and "spore," seed, the 

 seeds being coated with resin. 



All evergreen trees or shrubs, natives of Japan. 



No. 1. Retinospora Elwangepjana, Barry, the American 

 Tom Thumb, Arbor Vitas. 



Syn. Thuja Occidentalis ericoides, Hort. 

 ,, Elwangerianai, Hort. 

 hybrida, Hort. 



The leaves on this plant are of two kinds ; the primordial 

 ones being linear, acute, rather distant, spreading, somewhat 

 decussate, and from two to three lines long, while those on the 

 more mature parts are small, scale-formed, very acute, and closely 

 imbricated in four rows, with mostly a transparent gland on 

 the back, and of a bright green colour. Branches numerous 

 and erectly spreading. Branchlets very numerous, slender, and 

 either open and heath-like, or fiat and closely imbricated like 

 an Arbor Vitas. 



* I have retained the original name Retinospora, as it is now so gene- 

 rally used in garden literature, in preference to Chamsecyparis, to which 

 Retin'ospora is so very closely related, to prevent any further confusion. 







