70 Pub. Puget Sound Biol. Sta. Vol, 2, No. 35 



PLATE 17 



Fig. I. Young plant. x 1.2. 



Fig. 2. Young plant, x 1.2. 



Fig. 3. Young plant ; b, beginning of first lateral blade, x 0.6. 



P'ig, 4. Young plant; b, beginning of first 2 lateral blades, x 0.(j. 



Fig. 5. Cross section thru annual ring of haptere; r, the region of nar- 

 rower flattish cells, x 330. 



Fig. 6. Diagram of cross section of a stalk near its base showing the 

 narrower outer ring, July 10. x 1.2. 



Fig. 7. Plant, a, with top cut off, and a second plant, c, growing upon 

 it ; *, stunted branch, x 1 . 



Fig. 8. Longitudinal section thru the connection between the two shown 

 in Fig. 7 ; both have formed hapteres, but there is no union, x 0. t. 



Fig. 9. Split plant; right half forming blades on one side only; left 

 half forming blades on both sides and continuing to do so after 

 splitting again; I, leaf-traces, x 0.4. 



