IIQO 



A TEXTBOOK OF THEORETICAL BOTANY 



Some staminal modifications are extremely peculiar and their relation 

 to pollination is not clear. For instance in Acalypha (Euphorbiaceae) (Fig. 

 1 163) the filament is expanded like a perianth segment, but the anther forms 

 two curly, worm-like appendages extending out from both sides of the apex. 

 Cochliostema (Commelinaceae) (Fig. 1164) has two whorls of stamens. In 

 the outer whorl one is fertile and two are transformed into long hairy appen- 

 dages. In the inner whorl, one is reduced to a vestige and the other two 



Fig. 1 163. — Stamens with appendages. A, Acalypha. 

 Persea. {After Velenovsky.) 



B. 



Fig. 116^.— Cochliostema odoratissinmm (Commelinaceae). A, Floral diagram. B, Flower 

 with perianth removed, anterior view. C, The same, posterior view, showing four 

 fascicles of hairs and the tall sheaths enclosing the anthers. D, Sheaths separated to 

 show the spiral anthers. {After Velenovsky.) 



