OF NORTH AMERICA, 
41 
swelled obliqoal reticulate or squamose. 3 sp fc 
Abelwea cretica , sihiriea , and aquatica our 
own. 
573. PLEUROSTENA Raf, fl, tel. 413. 
Calix l'homboidal 5fid unequal. Stamens 5 
subequai, stigmas 3 sessile. Seed conical lon- 
ger than calix, unequal trigone, one side nar- 
rower. Flowers axillary polygamous. One 
of the 20 Genera blended in Polygonum, re- 
vised by me in fh tel. The type of this is a 
small western shrub. The name means nar- 
row side. 
574. Pleurostena serotxna Raf. Polyg. do 
Raf. An nat. 93. SufFruticose, stem striate 
much branched, branches angular virgate, 
leaves nearly sessile ovatoblong acute smooth, 
sheaths split lacerated, flowers axillary fasci- 
culate — discovered and published in 1820, a 
small shrub 2 or 3 feet high woody only at the 
base, quite autumnal blossoming late in Octo- 
ber, growing in fields and glades in Kentucky. 
Leaves quite small, flowers green 2 to 5 to- 
gether on short peduncles, often polygamous 
by the abortion of stamens. Different from 
Stopinaca fl. tel. 405 or Folygonella of Mx, 
which I have also. 
575. SPERMAULAXEN Raf. fl. tel. 416. 
Monoical, male fl. campan. 4-5Ad, segments 
subequal obtuse colorate. St am 4-5 very short, 
female fl. similar larger more unequal, seg- 
ments erect obovate, stigmas 2-3sessile. Seed 
pyramidal double of calix trigone, base con- 
crete, one side concave canaliculate. Shrub- 
by fl. spiked — another very distinct G. of same 
tribe akin to the last, to which perhaps belong 
also the exotic sp. blended as Polyg. ochreatum 
6 
