March, 1906.] Species for Ohio in Recent Literature. 
493 
away from the stem almost divaricately, but in the greater num- 
ber being ascending or suberect. As to the pubescence they 
exhibit not only different degrees but different kinds of hairiness ; 
and that of the midvein beneath invariably differs from that of 
the superficies of the leaf. In both the form and the indument 
of the bracts of the spikes one finds also another set of specific 
characters.” 
Among the new species named in this connection are several 
which from the localities reported are likely to occur in Ohio but 
onlv one is definitely accredited to the State, as follows: 
2. Persicaria laurina Greene.'^ 
“Of the size and the slender decumbent habit of P. remota, 
(u.'hich see below) but leaves elliptic-lanceolate and about seven 
inches long including the one-half inch petiole, thin, sparsly 
and minutely strigose on both faces, more pronouncedly and 
densely so on the midvein, especially beneath; ocreae, as also 
the lower internodes of the stem, sparsely appressed-hairy ; 
spikes very slender, 1 to 2 inches long, on slender glandular- 
hirtellous peduncles; bracts rhombic-ovate, hairy, not ciliate.” 
“Catawba Island, in Lake Erie, northern Ohio, .5 Sept., 1897, 
E. L. Moseley; the type specimens in the U. S. Herb. Leaves 
with the outline and venation of those of Lattrus nohilis.” 
P. remota Greene, referred to in the aobve description, was 
described from Maine in the same article, partly as follows: 
“Stem rather slender, 1 to 2 feet long, decumbent, the nodes 
enlarged, internodes 1 to 2 inches long, glabrous, many angled.” 
As the writer knows from past experience, Ohio is particularlv 
rich in forms usually designated as Polygonum emersum (Mx.) 
Britt., or closely allied species, and in the abundant material 
available in and about the many ponds, reservoirs, streams, 
canals, swamps, marshes, and along Lake Erie, there is a fine 
opportunity for some Ohio botanist to do some excellent 
systematic work. 
3. Sisymbrium officinale leiocarpum DC.^ 
Dr. B. L. Robinson calls attention to the fact that the eldest 
DeCandolle recognized two distinct forms of Sisymbrium officinale 
and that these two forms are present in the United States. 
Sisymbrium officinale Scop. “Rather copiously pubescent on 
stem and leaves ; the inflorescence and pods even at full maturitv 
subtomentulose ; whole plant bluish or grayish green.” 
S. officinale leiocarpum DC. “Sparingly pubescent with 
stiffish slightly retrorse hairs ; the inflorescence nearly smooth ; 
2. Greene. Edward L. Certain Poh’gonaceous Genera. Leaflets, 
I : 17-.50. January 5 and March 12, 1904. 
,3. Robinson, B. L. Two v'arieties of Sisymbrium Officinale in 
-\merica. Rhodora. 7 : 101-103. June, 190.'i. 
