258 PITTONIA. 
of the scape, often longer, seldom shorter, and, though mani- 
festly a little tapering, can never be called slender-conical. 
Its keel is more slender and compressed, and the outline of 
the back of the achene more distinctly angular, even sub- 
rhombic. Excellently typical specimens of M. major were 
distributed by me from Siskiyou Co., California, in 1876; 
and I have never in any previous study of the genus felt 
satisfied in leaving the plant to figure as representing M. 
minimus. 
MYOSURUS TENELLUS. Filiform leaves little more than an 
ineh long; scapes also filiform, but rather firm and erect, 
three or four times the length of the leaves, the longest 5 
inches: spikes very slender-conical, 1 to ? inch long; achenes 
few and not very closely compacted, the summit of some- 
what ovate-oblong outline, neither flattened nor bordered 
distinctly, the keel thick and obtuse, not compressed, show- 
ing a narrow furrow on either side, bounded by a more” 
less prominent nearly marginal nerve; beaks very short 
and straight. 
Var. AMPHIOXYS. Leaves distinctly but very narrowly 
spatulate-linear: spikes less tapering: achenes somewhat 
rhombic-lanceolate at summit and pointed at both ends, ter- 
minally by the beak, and basally by a narrow appendage; 
the lateral nerves less distinct. 
The type forms an almost grassy turf upon the desiccated 
mud of winter pools and ponds, in the western and middle 
sections of the State of Washington. i : 
The variety inhabits moist woods about Spokane 1n ee 
same State. Both are collected by Mr. C. V. Piper. ` : 
cram DECOR EMEN ESTNE INTE 
VioLA VITTATA. Acaulescent, white-flowered : leaves al- 
most linear (only slightly broader at the middle), 2 to 6 
inches long, on petioles a third as long, the margins Te 
motely and obscurely erenate, the apex obtuse, mucronate, 
lateral veinlets few, nearly parallel to the midvein: pe 
