246 



very long, in seven to ten pairs. Spikes lo to 30 cm. in length, 

 their lower portion often submerged. 



A few of the intermediate flowers perfect. Petals oval, rose-col- 

 ored. Stamens four. Fruit in specimens sent by the collector, Mr. 

 Pringle, about 2 mm. long by i to i ^ mm. broad, the carpels 

 sharply angled and ridged and occasionally scabrate on the back, 

 with a deep, narrow groove between them. 



No. 2,017, Pringle, Chihuahua, Mexico, Oct., 6, 1888. 



11. M.laxum. Shutt. in Chapman Fl. 143 (i860). 



Leaves in whorls of fours, the floral usually shorter than the 

 flowers, the lowest pectinate-toothed or pinnatifid, the uppermost 

 entire, linear or narrowly spatulate, sometimes all of them minute, 

 leaving the spike apparently naked ; submerged 10 to 20 cm. in 

 length, the capillary divisions about five on a side, and placed ir- 

 regularly on the rachis. Petals pink, sub-persistent. Stamens 

 eight. Fruit nearly 2 mm. long, by i ^ mm. wide ; carpels round- 

 ed on the back, strongly tuberculate-ri^ose. 



Ponds in middle and west Florida (Chapman). 



12. M. Farwellii. Morong. 



Recently published in these columns— BULL. TORR. BoT. 

 Club, for May, 1891., Collected by O. A. Farwell on the Ke- 

 weenaw Peninsula, Michigan. 



