6 
St. Minnesotense, n, sp. (Figs. 7 and 8). — Large, punctate, spin- 
ous, about as long as broad; semi-cells broadly elliptic, twice as wide 
as long, lateral angles each with two large, straight or incurved 
spines or aculei, three more pairs of similar spines placed slightly 
within the margin of the end, one on each side of the semi-cell; six 
more, often inconspicuous, arranged around the centre; end view 
triangular, with two spines at each angle, and two pairs near the 
margin between the angles, one on each side of semi-cell; around the 
centre are nine more, but often indistinct, spines. Diameter 65-75/* 
without and 90-100/^ with the spines. 
Frequent in Minnesota ponds. 
St. WoLLEANUM, Butler. (Figs, i and 2). Medium size, membrane 
punctate, about one-half longer than broad, moderately constricted, 
sinuses obtuse angles; semi-cell broadly oval or subhexagonal, superior 
and lateral angles produced into subcylindrical, somewhat swollen 
processes or arms, slightly notched at the apex; four more similar 
processes within the margin; end view regular, hexagonal, each 
angle furnished with an arm as in front view; within the margin, 
arranged in a circle around the centre, are six more and less conspic- 
uous processes. Diameter of body 40 by 50//; with arms, 65 by 83/i. 
Vicinity of Minneapolis, Minn. 
This species was discovered and identified as new by Miss E. 
Butler, who declines to have the name chansed. 
New Grasses. 
By Geo. Vasev. 
j Trisetum Ludovicianum.— Culms 2 to 2.5 ft. high, stout, erect, 
smooth, leafy; lower 3 or 4 leaves near the base 6-10 inches long, 
the margins and sheaths pubescent; upper leaves (2) larger and with 
long, striate, smooth sheaths, the upper sheath 9-10 inches long and 
reaching to the base of the panicle, blade 6-10 inches long, 3-4 '^i^^^ 
wide, roughish. Panicle 6-10 inches long and about one inch wide, 
erect, nodding at the apex, rather loose, the branches semiverticil- 
late, erect, mostly in fives, unequal, the longer ones 2 to 4 inches long 
and flowering nearly to the base, the rachis and pedicels smooth or 
nearly so, pedicels about as long as the flowers; spikelets 2- to 3- 
(mostly 2-) flowered, the lower flower unawned; outer glumes smooth 
or slightly hispid on the keel, 2.5 to 3.5 lines long, 3-nerved, acute, 
with broadly scarious margins, the upper obovate, tlie lower rather 
shorter and narrower; the flowering-glume of the lower flower 3-3-5 
lines long, narrowly lanceolate, nearly smooth, acute or acutish, but 
not bifid; second flowering-glume 2-2.5 lines long, punctulate scab- 
rous, rather thicker than the lower one, with a rather scarious mar- 
gin, acuminate, but hardly toothed at the apex, obscurely 3-nerved, 
dorsal awn from the upper fourth, as long as or longer than its S^^"^;^' 
the palets one-third shorter than the glumes, membranaceous, bind 
at the apex; rhachilla sparsely pubescent, terminated with a short 
rudiment, or occasionally with an imperfect flower. 
Found along the borders of a cane-field in Louisiana, by Rev. A- 
B. Langlois. Doubtfully referred to the genus VenUnata by P^^i. 
