ORDER 129. CYC AD ACE JE. 

 ORDER CXXIX. CYCADACE^E. CTCADES. 



665 



Trees of low stature, simple truuks with the internodes undeveloped and the sur- 

 face scarred with the fallen leaves which were pinnate, parallel-veined, circinate. 

 flowers dioecious, in cones, $ anther covering the under surface of the connective. 

 2 Scales peltate, scale-like or leaf-like, bearing naked ovules dorsal or marginal. 



General, species 46, chiefly tropical. The Cycades form the connecting link between the 

 Exogens and the Cryptogaiuia. 



CTCAS revoluta, a palm-like plant, representing this order endures 

 the winters of the far South, and is frequent in the greenhouses of the 

 North. Its long, pinnate leaves are all clustered at the summit of the 

 short, 'abrupt trunk which is tesselated all over with leaf-scars. 



FIG. 693. 1. Branch of Thuja occidentals, with strobiles. 2. A magnified branchlet with 

 a zone o staminate flowers. 3. A carpellary scale with the two winged seeds. 4. A vertical 

 tranverse section of one of the seeds, showing the embryo, fec. 5. The immature, erect ovules. 

 6. One of the ovules enlarged, showins the micropyle at top. 7. Branch of Abies Americana. 

 8. Scale, with the bract. 9. Scale with immature ovules. 10. Scale with ripe seeds. 11. A pair 

 of leaves of Pinus resinosa. 12. Anther of Pinus sylvestris. 13. Scale of the cone, with the 

 ovules turned downward. 14. Staminate scale of Cupressus, with pollen. 15. Fertile scale, with 

 many erect ovules. 



