Fig. 568: Myriophyllum exalbescens: a, diagram of staminate flower, showing 

 perianth segments in 4's, stamens 8, and 3 subtending bracts, with 2 of them shorter 

 than the third, x 10; b, young staminate flower, x 8; c, nutlet (cross section), x 8; d, 

 mature nutlet, rugose on back, x 8; e, spike, the staminate flowers at the apex, the 

 pistillate flowers below, x 4; f, mature fruit, top view, x 8; g, mature fruit, side view, 

 x 8; h, submersed leaf, x 2; i-k, bracts of inflorescence, x 6; 1, habit of plant entirely 

 submersed except for the spike, showing whorls of leaves, x %. (From Mason, Fig. 

 281). 



