ORDER 129. CYC AD ACE JE. 



ORDER CXXIX. CYCADACE^E. CYCADES. 



665 



Trees of low stature, simple trunks 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. 

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



Genera 7, species 46, chiefly tropical. The Cycades form tho connecting link between tho 

 Exogens and the Cryptogamia. 



CY V CAS revoluta, a palm-like plant, representing this order endures 

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

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

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



12 



FIG. 693. 1. Branch of Thuja occid 

 a zone of staminate flowers. 3. A ca 



identalis, with strobiles. 2. A magnified branchlet with 



.v,nv, otaiuiuuu, uuwers. a. A carpellary scale with the two winged seeds. 4. A vertical 

 tranverse section of one of tho seeds, showing the embryo, &c. 5. Tho immature, erect ovules, 

 b. Une of the ovules enlarged, showing the micropyle at top. 7. Branch of Abies Americana. 

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

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

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



