THE ANGIOSPERMAE 1249 



2. The staminal nectaries are united into a 



ring in Silenoideae. 



3. The nectaries form swelHngs which may be 



either isolated or united in various 

 ways, in Cruciferae. 



The nectaries in Cruciferae have 

 been used as a means of classification by 

 Bayer. It is open to question whether 

 these nectaries are outgrowths of the 

 receptacle around the bases of the 

 stamens or whether they belong to the 

 stamens themselves. As the nectaries 

 in the closely related Fumariaceae are 

 undoubtedly staminal, the latter alter- 

 native seems the more probable. 



(d) The nectaries form appendages of the stamen filaments. 



Example: Paired appendages, like stipules, in many 

 Lauraceae. 



(e) The nectaries are staminodes. 



Examples: i. Nectar is secreted from the connective in 



Anemone Pulsatilla. 



2. Nectar is secreted from staminodal appen- 



dages in Sassafras and Persea. 



3. Nectar is secreted adaxially at the base 



of palmately branched staminodes in 

 Parnassia. 



4. Nectar is secreted by a ten-lobed cup with 



ten vascular strands, in Phaseoleae. 

 Probably a reduced whorl of stamens. 



(/) The nectaries are formed at the junction of stamen and petal 

 in epipetalous stamens. 



Examples: Nectar is secreted by a yellow-coloured nectary 

 surrounding the base of the free part of the filament 

 in Colchicum and Trillium. The nectar collects in a 

 channel of the petal. 



5. Perigonial Type. Nectar is secreted by the perianth members. 



(a) Nectar is secreted by the sepals, a rare phenomenon. 



Examples: i. Secretion from the coloured, fleshy calyx 



in Cuphea. 



2. Secretion from the base of the sepals in 

 Atragene. 



