SchpUS. TRIANDRIA MONOGYNIA. 215 



Scales broad-cordate, a little pointed. Stamens three ; the 

 bristles of the foregoing five species are here wanting. Style 

 slightly two-cleft. Seed three-sided, smooth, white. 



9. S. snbarticulatus. R. 



Culms from two to three feet high ; culmnnar, intercepted 

 with inconspicuous partitions. Spikes obtuse, crowded into a 

 head near the base. Seed three sided, pointed. 



A native of the same places with the former. 



Root resembling that of the preceding species. Culm 

 erect, from two to three feet high, round, smooth, naked, in- 

 tercepted every quarler of an inch by a slight membrane; 

 their places do not appear externally even when the plant is 

 dry. Leaves no other than a sheath or two. Head lateral, near 

 the base of the culm, sessile, globular, composed of many 

 (about one hundred) small, oval, obtuse, sessile, many-flow- 

 ered spikes. Scales oval, membranaceous. Seed three-sided, 

 white, smooth. 



10. S. dubius. R. 



Root tuberous. Culms naked, culumnar; intercepted with 

 numerous partitions. 



Telincj. Alh'ke. 



Roots tuberous, with stolones and numerous fibres issuing 

 from them, outwardly of a dark dusky colour, inwardly 

 white. Leaves erect, cylindric, smooth, about afoot long. 



Obs. I have never met with flowers of this plant which 

 is a native of wet sandy pasture ground, and was formerly 

 considered as a species of Isoetes. The natives boil and eat 

 the roots which they say are as good as yams. 



U.S. capitatus. Linn. sp. pi. ed. Willd. i. 294. Vahl. ii. 

 250. 



Culms naked, from four to eight inches high, culumnar. 

 Spikes terminal, globular. Seed black, roundish, bristle- beset. 



