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 

 only one is definitely accredited to the State, as follows: 



2. Per sic aria laurina Greene.' 



"Of the size and the slender decumbent habit of P. reniota, 

 (zvhich see heloiv) 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 thohe of Laurus nobilis." 



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 enter sum (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 maturity 

 subtomentulose ; whole plant bluish or grayish green." 



5. officinale leiocarpum DC. "Sparingly pubescent with 

 stifhsh slightly retrorse hairs ; the inflorescence nearly smooth ; 



2. Greene. Edward L. Certain Polvgonaceous Genera. Leaflets, 

 I : 17-50. January 5 and March 12, 1904. 



3. Robinson, B. L. Two varieties of Sisymbrium Officinale in 

 America. Rhodora, 7 : 101-10:3. June, 1905. 



