330 DESCRIPTIONS OF THE SHRUBS 



we have to consider, retain the juvenile form ; others have both forms on 

 different parts of the jlants ; while still others have only the scale leaves. 

 The two genera above given can be surely separated only by an examina- 

 tion of the cones ; and small plants rarely show these. The cones of 

 Thuja are elongated with 8 to 12 lapping scales, and those of Chamae- 

 cyparis are nearly globular of 6 to 10 scales touching edge to edge. All 

 these cones mature in one season and are small, always less than an 

 inch and usuaUy J to J inch in diameter. 



When the scale leaves appear, the branches on both genera so form as 

 to produce flat fan-like growths. This plan of branching, called 2-ranked, 

 separates the Arborvitse from all the Junipers — Juniperus — aad the 

 true Cypresses — Cupressus. 



These plants will be found in books and nursery catalogues under the 

 names of Thiija, Thuydpsis, Bi6ta, Cupr&sus, Chamsecyparis, and 

 Retin(5spora ; but they will not all be spelled as here given. The first 

 is often spelled Thtiia and Thuya in modem books, and the last 

 Retinfepora. 



KEY — BASED ON THE CONES — FOR SEPARATING 



THE DWARE EORMS OF THUJA AND CHAM^- 



CYPARIS 

 * 



* Cones elongated, vrith elongated lapping scales, Thdja. (A.) 



A. Cone scales thin, 8-10 in. number ; cones J inch long and some- 

 what pendulous. Common ARUOEVixiE (588) — Thuja occi- 

 dentaiis. 



A. Cone scales 6-8, thickened, and having a Korn-like process on 

 each. Cones nearly erect, and about an inch long. Eastern 

 or Chinese Arbokvit^s; (589) — Thuja orientalis. 



A. Cone scales 8-10, thickened and reflexed, with 3-5 seeds under 

 each ; cones somewhat pendulous. Dwarf Dolabeata Arbok- 

 viTjL (590) — Thuja (Thuyopsis) dolabr^ta. 



* Cones globular, of 6-12 scales, which touch edge to edge. Chamse- 



cyparis. (B.) 



B. Cones about J inch in diameter, of 8-10 brown scales. Hinoki 

 Retinospora — Chamsecyparis obtusa. 



B. Cones about J inch in diameter, of 10-12 brown scales. Sawara 

 Retinospora — Chamsecyparis pistfera. 



B. Cones about J inch in diameter, of 8 reddish brown scales. Law- 

 son's Cypress (591) — Chamsecyparis Lawsoniana. 



B. Cones about J inch in diameter, of 6 glaucous-green or purplish 

 scales. White Cedar — Chamsecyparis thyoides (C. sphse- 

 roidea). 



