Fi^. 528. 



ORGAXS OF REPRODrCTION". 247 



Fig. 530. 



Fig. 5;>8. Apocarpous pistil of the Crowfoot {'Ranuncnhis'), with two stamens 

 arising from the thalamus helow it.— Fig. 529. Vertical section of a 

 flower of the Primrose (Primula), showing epipetalous stamens. The 

 pistil in the centre has an ovary with a free central placenta, a style, and 



a capitate stigma. lig.hSO. Vertical section of theflowerof theCherry, 



showing the perigynous stamens surrounding the pistil. 



2. Insertion ov Position. — When the stamens are free from the 

 calyx and pistil, and arise from the thalamus below the latter 

 organ, as in the Poppy {Jig. 426) and Crowfoot (/^. 528), they are 

 said to be hypogymms, which signifies imder the female or pistil ; 

 this is the normal position of the stamens. When the .stamens 

 are attached to the corolla, as in the Primrose {jig. 529), they are 

 epipetahiis ; this is commonl}', but not universally, the case when 

 the corolla is monopetalous. The insertion of the stamens is al- 

 ways regarded as the same as that of the corolla, so that when the 



Fig. 531, 



Fig. 532. 



Fig. 533. 



Firi. 531. Vertical section of the flovrer of a species of Cumpavnla. with 



episynous stamens. Fig. 532. Flower of Orchis mascnla. The column 



in the centre is formed by the union of the stamen.^ and style. Fig. 



.">33. The pistil and stamens of Birrhwort {AristolnchicD. The ovary is 

 seen below, and the stamens above united into a column with the style. 



