oa 
156 MISSOURI BOTANICAL GARDEN. 
Nelson’s number 549, distributed as ZH. dentata. This 
species very much resembles small, narrow-leafed forms of 
E. dentata, in habit. Especially do those with wider ovate 
or oblanceolate leaves, of which the following are examples: 
Pringle, Arizona, 1884; Rusby, N. Mex., 1880, no. 379; 
Miss Mulford, New Mex., 1895. The figure in Boissier’s 
Icones Euphorbiarum, probably from Wright’s specimen, 
represents the narrow-leafed smoother form. 
AcaLypHa LInDHEIMERI Muell. 
The species has been described as having the leaves acute 
at the base. All the specimens I have seen from the 
United States have the base, except in the upper leaves, 
obtuse, and in many subcordate. Specimens collected by 
Wilkinson at San Antonio, Tex., lack the spreading pubes- 
cence on the stem. 
SAGITTARIA ARIFOLIA AQuaTiuis, J. G. Smith in herb. 
Aquatic ; leaves floating, petioles slender, 2-6 dm. long, 
leaf blade narrow, basal lobes usually curved inward; 
phyllodia long linear; fertile pedicels mostly 1 cm. long ; 
stamens somewhat thickened at the base; mature achenes 
not seen.—Specimens examined from Lake Pend qd’ 
Oreille, Idaho, collected by Leiberg, 1891, no. 526, also 
by Henderson, same locality, 1897, no. 2977, **in water 
6-12 inches deep.’’ It may be that the specimen collected 
by Davis, Alma, Mich., 1890, with broad linear lanceolate 
phyllodia belongs here.— Plate 50. 
Perhaps a distinct species but seems to be connected with 
typical S. arifolia by some of the Leiberg specimens of 
which there is a full series from water a few inches to 
several feet deep. The characters of the variety as given 
above slightly amplify the description of the species as 
published in Mr. Smith’s monograph of the genus. 
