232 Engelmann and Gray, 
169. Srituinera sytvatica, Linn. Prairies. April — June. 
170. S. LicusrRINA, Michx. Thickets near water-courses, 
Houston. May.— The staminate flowers are rather conspicu- 
ously pedicillate, not brevissime pedicillatis, as described by 
ichaux. 
171. Piriwoenyruw Linpueimert (m. sp.): annuus, stel- 
lato-tomentosus ; caule (4—5-pedali) erecto ramoso; foliis 
longe petiolatis e basi ovata subcordatave lanceolatis sæpe 
acutato-mucronatis, inferioribus denticulatis ; floribus fcemineis 
paucis ad basin spicee mascule ; staminibus sub-12 ; stigmati- 
bus plerumque 12; seminibus vix compressis. — Dry prairies, 
Houston to the Brazos.. Also, Texas, Drummond, and West- 
ern. Louisiana, Leavenworth. A taller, more upright plant 
than P. capitatum (Croton, Michz.,) with larger and less 
- canescent leaves; the lower 4—5 inches long, and gradually 
acuminate to an usually sharp point, on petioles 3 inches long. 
"The spike in fruit is less capitate, and the seeds are smaller 
and less compressed. Something like intermediate specimens : 
between this and the P. capitatum, his also grows. in 
A remaining species, the Polygonum fimbriatum of Elliott, which has been deemed 
a near ally of Polygonum polygamum, may be taken as thé type of a new genus, 
viz. 
$ 
THYSANELLA, A. Gr. , 
n pre a boo pomami, Sarina eta gokat Aig phyllis omnibus 
argine scariosis et eroso-fimbria s, duobus oribus cordato-sagitta ttatis 
pie dtiherin come nterioribus de orones pectinato- -fimbriatis. 
tamina 8 : filamenta filiformia perigonium adequa Qon sr air t - 
num: s 3, filiformes; stigmatibus meee ibus — i neler tall 
v ew alate — Herba glabra, (b ipedalis, in arenosis on 
gia v vigens, m vitgatis strictis ; ; s folis angusto-linearibus e cng tis acutatis 
adr sessilibus rbatis ; floribus 
ned ratenioao- -spicatis ; - Feste solitariis vel geminis, E faic 
im tim ochreato-bracteatis ; ers —_— truncatis iu en aris 
princi; Si redes. in medio articulat 
TT 
ne (which were collected by Dr. Leavenworth either in Georgia or mi: 
S are apparently all sterile. The fruit and seed i is, therefore, unknown [i 
"not certain the ou increase in 
flowering. 
gw 
$5 
