SPERMATOPHVTA 



377 



Fig. 321. Floral development in the buttercup (Ranunculus), X50. A to D, successively 

 older stages; 6, bract; s, sepal; p, petal; st, stamen; c, carpel; o, ovule. 



Fig. 322. Floral development in shepherd's-purse (Capsella bursa-pastoris), X 100. 

 A to D, successively older stages; s, sepal; st, stamen; c, carpel; p, petal. The order of 

 appearance differs from that of a typical flower in that here the petals appear last. 



