GROUPS OF PLANTS. 



73 



leaves, and are usually quite simple in structure. The leaves vary 

 in form but are usually narrow and somewhat thickened giving 

 them a needle-like appearance. 



In addition sporophylls (spore-bearing leaves) are formed at 

 the ends of the young shoots or in the axils of more mature ones 



Fig. 47. Cones of several pines. A, two mature nearly lateral cones of pitch pine 

 (Pinus rigida)\ B, young terminal cones composed of megasporophylls (carpels) of the 

 long-leaved pine {Pinus palusiris); C, numerous cones composed of microsporophylls 

 (stamens) of the same pine. 



(Fig. 47). These are compactly arranged forming cones or 

 strobili which are always of two kinds and borne on different 

 twigs of the same plant or on different plants. The staminate 



