LIST OF CONIFERS AND TAXADS, 



187 



subjects are discussed at length in my Eeview of some Points 

 in the Comparative Morphology, Anatomy, and Life-history of 

 the Coniferse" in the "Journal of the Linnean Society," vol. 

 xxvii. (1889). 



The Order Conifer£e admits of subdivision into tribes, sub- 

 tribes, and genera as follows : — 



I. — The Cypress Tribe (Cupressine^). 



Trees or shrubs usually with the adult leaves appressed, opposite, 

 whorled, in 3-4 rows, small, scale-like, rarely linear. Buds not scaly. 

 Flowers usually monoecious. Cones globular or oblong. Scales mostly 

 confluent with the bracts, decussate, generally woody when ripe, but 

 leathery in subgenus Cham^ecyparis of Cupressus, and fleshy in Juni- 

 pers. Seeds erect. 



Subtribe 1. Juniper inse. — Flowers monoecious or dioecious. Cone- 

 scales fleshy, at length confluent. Seeds not winged. 



JUNIPERUS. 



Subtribe 2. Callitrinx. — Cone-scales verticillate, dry, valvate. 

 Seeds usually winged. 



Callitris. Widdringtonia. 

 Tetraclinis. Actinostrobus. 



Subtribe 3. Thuinse. — Flowers monoecious. Cone-scales dry, decus- 

 sate or subspirally arranged, oblong or peltate. Seeds winged except 

 in subgenus Biota of Thuya. 



FiTZROYA. Thuya. 

 Cupressus. Libocedrus. 



II. — The Taxodium Tribe (Taxodie^). 



Trees with narrow linear leaves spirally arranged, sometimes 

 apparently two-ranked, not whorled. Buds not scaly. Flowers 

 monoecious. Cones globular or oblong ; scales spirally arranged, more 

 or less woody. Bracts partially consolidated with the scales. Seeds 

 2-6 to each scale, erect or inverted, winged. 



Cryptomeria. Sequoia. 



Taxodium. Athrotaxis. 



Glyptostrobus. Sciadopitys. 



III. — The Fir Tribe (Abietine^). 



Trees with adult leaves linear, arranged spirally, but apparently 

 in two or more rows, or in tufts. Buds scaly. Flowers monoecious. 

 Cones mostly woody ; scales arranged spirally, manifestly double — 

 i.e. the bracts, though relatively small, remain separate from the seed- 



