330 DESCRIPTIONS OF THE SHRUBS 



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

 different parts of tlie jJants ; 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 Chamse- 

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

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

 inch and usually ^ 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 Arborvitae from all the Junipers — Juniperus — and the 

 true Cypresses — Cupressus. 



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

 names of Th,uja, Thuydpsis, Bi6ta, Cupr&sus, Chameecyparis, and 

 Retindspora ; but they will not all be spelled as here given. The first 

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

 Retinispora. 



KEY — BASED ON THE CONES — EOR SEPARATING 

 THE DWARF FORMS OF THUJA AND CHAM^- 

 CYPARIS 



* Cones elongated, with elongated lapping scales. Thuja. (A.) 



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

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

 dent&lis. 



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

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

 or Chinese Arborvit^ (589) — Thuja orientilis. 



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

 each ; cones somewhat pendulous. Dwarf Dolaerata Arbor- 

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



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



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 — Chamfecyparis pislfera. 

 B . Cones about | inch in diameter, of 8 reddish brown scales. L aw- 



son's Cypress (591) — Chamaecyparis Lawsoniilna. 

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



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



roidea). 



