J904] Rehder, — Pseudo-monoclinism of Chionanthus 



19 



Stain inate /lowers : 



Kig. 1. 



number of fruiting panicles and each one bore from 5 to 12 and 

 occasionally even to 20 fruits. 



The chief differences which show, however, intergradations between 

 the staminate and the pistillate dowers, as they may be called, though 

 the latter are not perfectly monoclinous, are the following — 



FistiUate flowers : calyx with ovate to lance-ovate sepals, shorter than 

 or as long as the style, petals generally smaller 

 and narrower, usually about 20 mm. long; 

 filaments elongated, about half as long as the 

 anthers, these narrower, distinctly apiculate, 

 exceeding the corolla tube, the anther-cells 

 remaining closed ; pistil with well developed 

 stigma (fig. 2). 



calyx with lanceolate 



sepals, longer than the style, petals generally 

 longer and broader, attaining 2^ mm. in 

 length, stamens occasionally 3 or 4, filaments 

 very short, anthers short-apiculate, 1.5-2 mm. 

 long, not or slightly exceeding the corolla 

 tube ; pistil somewhat smaller with imper- 

 fectly developed stigma (fig. i). 

 The ovary of the staminate plant, though somewhat slenderer, 

 hardly differs from that of the pistillate plant and contains appar- 

 ently well developed ovules. The anthers 

 of the pistillate flowers also have the 

 appearance of normal anthers, though 

 somewhat narrower, and are filled with 

 numerous pollen cells, but these differ 

 from the normal ones in being somewhat 

 smaller and nearly subglobose and I 

 could not distinguish the granular struc- '^' ^' 



ture of the extine which can be observed in 

 the normal ovoid anther cells. 



The panicles of the staminate plants are 

 usually larger and more fioriferous, and as 

 the individual flowers have generally longer 

 and broader petals, the staminate plants 

 are more showy in bloom and therefore 

 ^'^" '*■ superior as an ornamental plant. 



In the second species of the genus, Chionanthus retusa, Lindley & 



Fig. 2. 



