1894. ] Briefer Articles. 330 
portunity for the admission of light, air, and moisture sufficient for 
the further growth and development of the cells. Division then tak- 
ing place in the only direction possible from the shape of the enclosed 
space, a row of cells is formed which resembles in a marked manner 
filaments of Oscillaria. 
This form of growth then affords a striking illustration of the effect 
of outward mechanical conditions by the modification into a filament, 
of cells which under normal conditions exist in simple masses or 
groups.— JosePHiIne E. TiLpEN, Botanical Laboratory, University of 
Minnesota. 
EXPLANATION oF Plate XXX.—Fig. 1, portions of a gill. Only one lobe is 
figured, the shape of the other being indicated by dotted lines. X84.—Fig. 2, 
one of the hairs from the gill. x450.—Fig. 3, an antenna. X 450. 
Northwestern notes.—Lathyrus paucifiorus, n. sp.—Rather slender, 
two feet or more high: stipules broadly lanceolate and halberd shaped, 
an inch or more long, a third as wide, acuminate above, acute or ob- 
tuse below, usually coarsely toothed; leaflets three to six pairs, thick- 
ish, oblong-lanceolate or ovate-oblong, strongly apiculate, almost ses- 
sile, one or 1% inches long: peduncles as long as or longer than the 
leaves, 3- or 4-flowered: flowers purple, an inch long; calyx teeth cili- 
ate, the middle triangular-lanceolate ones twice as long as the upper tri- 
angular ones and two thirds as long as the lower lanceolate tooth; pods 
hot seen.—Collected at Roseburg, Oregon, by Thomas Howell, June, 
ry a 
AL “1AM UIALL 
(no. 810); and at Snake River Cafion, Washington, by C. V. Piper, May 
27, 1893 (no. 1,487). This species has been confused with Z. polyphyllus 
Nutt. from which it is distinguished by its few large flowers, gh 
thickish leaves, and narrower stipules. 
Rosa NuTKaNna Presl, var. hispida, n. var.—A form alaaadtanies 
made conspicuous by its strongly glandular, hispid receptacle and 
glandular calyx, though not otherwise differing from the type.—Col- 
lected at Rock Creek, Montana, by Dr. Watson, July 27; 1880 (no. 
124); and at Pullman, Washington, by Seb’ fa Piper, June and Sept., 
1893 (no. 1,540). 
ochortus pavonaceus, n. sp.—Stems 10-20 inches high, from a 
small bulbous base, with a bract in the middle an inch or two long: 
leaves two-thirds as long as the stem, three or four lines wide, strongly 
‘avolute in the dried specimens: the 1~4-flowered umbel ee : 
aS Many unequal bracts, the longest rather longer than the pedicels; 
at least one of the pedicels becoming three inches long: sepals wad 
lanceo! ate, acuminate, glabrous, 1-1% inches long, ee ae 
With violet Within, the thin scarious margin almost transparent: _ 
*5—Vol. XIX.—No. §. | 
1887 (no. 677); at Wawawai, Washington, by Lake and Hull, June, 1892 
ih 
a 
