EXPLANATION OF PLATE I. 



Fig. 1. Part of the flower of Drymocallis convallaria, showing staminiferous disk and 

 two festoons of stamens. 



Fig. 2. Part of the flower of Potentilla Nuttallii, showing the arrangement of stamens. 

 Fig. 3. Part of the inside of the hypanthium in Horkelia argyrocoma, showing the 

 arrangement of the flbrovascular bundles. 



Fig. 4. Section of the receptacle of Fragaria Californica. 

 Fig. 5. Fistiloi Drymocallis convallaria. 

 Fig. 6. Pistil of Potentilla Nuttallii. 

 Fig. 7. Pistil of Argentina Anserina. 

 Fig. 8. Diagram of flower of Horkelia argyrocoma. 

 Fig. 9. Diagram of flower of Potentilla Nuttallii. 

 Fig. 10. Diagram of flower of Potentilla biennis. 

 Fig. 11. Diagram of flower of Chamaerhodos erecta. 

 Fig. 12. Diagram of flower of Comarella multifoliolata. 

 Fig. 13. Diagram of flower of Drymocallis convallaria. 

 Fig. 14. DisigTajn. of &ower of Potentilla sulphurea. 

 Fig. 15. Diagram of Aower of Stellariopsis santalinoides. 



b. bractlets. ap. antipetalous stamens. 



g. gynoecium. as. antisepalous stamens. 



p. petals. pp. parapetalous stamens. 



s. sepals. ps. parasepalous stamens. 



fs. festoons of stamens, 

 up. point of union of the flbrovascular bundles from the stamens and the petals, 

 us. point of union of the flbrovascular bundles from the stamens and the sepals. 



