Oitfam 129.— CYOADACE^. 



665 



Ordeii CXXIX. CYCADACEJE. Cycades. 



Frees of low staturo, simple trunks with the internodes undeveloped and the sur- 

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

 Flowers dioecious, in cones, J anther covering tho under surface of the connective. 

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



Genera T, species 46, chiefly tropical. Tho Cycades form tho connecting linlc between tho 

 iSxogens nnd the Oryptogamin. 



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

 the winters of tho 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. 698. — 1. Brunch of Thuja occidontalis, with strobiles. 2. A nagniflecl branchlet with 

 n zone of iit.<iminato flowers. 3. A carpellary scale with the two winged seeds. 4. A vertical 

 tranversc st'ction of one of the seeds, showing the embryo, &c. 5. The inimatuTC^ erect ovules. 

 6. One of the ovules enlarged, showing tho micropylo at top. 7. Branch ol" Abies Americana. 

 8. Scale, wilh the bract 9. Scale with imraaturo ovules. 10. Scale with ripo seeds. 11. A pair 

 of leaves of Pinus resinosa. 12. Anther of Pinua sylvestris. 18. Scale of tlio cone, with tbo 

 ovules turned downward. 14. Stanunatb scale of Cupressits, with pollen.. 15. Fortllo scale, with 

 many erect ovules. 



