ENUMERATION OF CONIFERS 193 



AA. Cone-scales and leaves spirally arranged, the latter some- 

 times fascicled; ovules inverted, rarely upright. 

 B. Scales of cone without distinct bracts, flat or peltate, 

 with 1-9 seeds. 

 c. Carpels with 2-9 oi-ules, more or less divided into 

 scale and bract, coalescing and connate at maturity; 



cotyledons 2-9 Subfam. II. Taxodine.e 



D. Leaves dimorphic, partly scale-like and scattered, 

 partly linear and connate into whorled pairs: 



cone-scales thick and woody, imbricate 11. Scl\dopitys 



im. Leaves never connate, homomorphic or hetero- 



morphic, always scattered. 



E. Form of cone-scales peltate: leaves heteromor- 



phic. 



F. Scales with 2 upright seeds: staminate flowers 



paniculate: branchlets deciduous the first 



or second year 12. Taxodiu.m 



FF. Scales with 5-7 pendulous seeds: staminate 

 flowers spicate: branchlets persistent for 



several years 13. Sequoia 



EE. Form of cone-scales flattened, imbricate. 



F. Seeds of each scale 2, pendulous: leaves 



^ hcteromorphic 14. Taiwania 



FF. Seeds of each scale 3-7: leaves homomorphic. 



G. Staminate flowers solitary: scales with .'J-G 



pendulous seeds: leaves scale-like or 



lanceolate and short 15. Atiirotaxis 



GG. Staminate flowers spicate or umbellate. 

 H. Arrangement of staminate flowers spi- 

 cate: scales with 4-5 erect seeds: leaves 



awl-shaped IG. Cryptomeria 



HH. Arrangement of staminate flowers umbel- 

 late: scales with 3 pendulous seeds: 

 leaves lanceolate, flat, 1-2 in. long. . . .17. Cunxingiiamia 

 cc. Carpels simple, with 1 inverted ovule; cones large; 



cotyledons 2-4 Subfam. III. Araucarine.e 



D. Seed adnate to the scale at base: leaves 4-angled or 

 flat and broad at base, crowded, not or indis- 

 tinctly 2-ranked 18. Araucaria 



DD. Seed free: leaves on lateral branches 2-ranked, 

 large and flat, more or less distant, narrowed 



at base 19. Agathis 



BB. Scales of cone subtended by distinct bracts; scales with 

 2 inverted ovules; seeds winged, rarely wingless: leaves 

 linear or needle-shaped: winter-buds distinct with 



scarious scales Subfam. IV. ABiETrNE-E 



c. Arrangement of leaves solitarj'. 

 D. Cones upright. 



E. Cone-scales persistent; bracts much shorter; 

 seeds about as long as scales: leaves flattened, 

 keeled above 20. Keteleeria 



N 



