KEY TO DWARF THUJA AND ClIAM^fiCYrAKlS 331 



KEY — BASED MAINLY OX THE LEAVES — EOR THE 

 DWARF VARIETIES OF THUJA AND CHAM^- 

 CYPARIS 



* Leaves about linear, and spreading -well from the stems. (A.) 

 A. Leaves sharp-pointed and rather stiff, dull green above, and 



graj'ish below, changing to brcfwnish in winter. (B.) 

 B. Bush globose or broadly pryamidal; leaves rather distantly 

 arranged on slender branches. Heath-leaved ArborvityE 

 (692) — Thuja occidentalis ericoides. 

 B. Bush of several erect stems, and branches also erect ; leaves 

 not so distantly arranged. Juniper-leaved Arborvit^ 

 (593) — Thuja orientalis decussata. 

 A. Leaves less sharp, soft rather than stiff, and with a somewhat 

 silvery appearance ; low tree, but sometimes shrub-like, with 

 branches much divided. Silver Retinospora (594) — Cha- 

 msecyparis pisifera squarrosa. 

 A. Leaves as in the last, but more spreading ; silvery only on lower 

 side. Juvenile Cypress (595) — Chamaecyparis thyoides 

 ericoides. 



* Leaves of two kinds on different branchlets, some linear and 



spreading, others scale-like ; branches with scale leaves flattened, 

 fan-form. (C.; 



C. Low, compact, and broadly spreading, with somewhat silvery 

 foliage. Tom Thumb (59(3) — Thuja occidentalis EUwangeriana. 



C. Similar to the last but of more erect growth, leaves bluish green. 

 Intermediate Cypress (597) — Chamaecyparis thyoides (C. 

 sphaeroidea) Andely^nsis. 



C. Similar (to first C), but the upper branchlets slender and spar- 

 ingly divided. Spaeth's Arborvit^ — Thuja occidentalis 

 Spaethii. 



C. Most leaves elongated and slightly spreading; conic bush with 

 erect branchlets having a feathery appearance. Feathery Pea- 

 fruited Retinospora (598) — Chamaecyparis pisffera plumosa. 



* Leaves all shortened and scale-like ; spray fan-like. 



There are so many varieties in cultivation under this third * that it 

 will probably be better to give them under the names of the species, 

 allowing for the fuller descriptions. 



Hatchet-leaved Arborvit^ — Thuja dolabrata — Is one of the finest 

 of the Japanese trees, and is especially good for lawn planting in single 



