1914] Suksdorf,— Is Arenaria lateriflora dioecious? dd 
entire, its bristly, instead of merely scabrous puberulent stems, and the 
generally acute involucral scales, not rounded at tip, nor erose. From 
S. fistulosa it differs in the entire, instead of crenate-serrate leaves, 
not distinctly divided into upper and lower cauline, whereas S. fistu- 
losa shows a pronounced gradation in the leaves from base to summit. 
S. aspericaulis finds its nearest relative probably in S. Chapmani, 
although it is abundantly distinct from it. 
SOLIDAGO TORTIFOLIA Ell. Sketch Bot. S.-C & Ga. ii, 377 (1824). 
S. odora Michx.? Fl. Bor.-Am. ii, 118 (1803), not Ait. 
SoLipaGo FIsTULOSA Mill. Gard. Dict. ed. 8, no. 19 (1768). 
S. pilosa Walt. Fl. Car. 207 (1788). This is usually referred here, 
but the description 1s very meagre. 
WasniINGTON, D. C. 
IS ARENARIA LATERIFLORA DIOECIOUS ? 
WILHELM SUKSDORF. 
Mn. R. W. WoopwaRp's paper, On Variation in Arenaria lateri- 
flora, in Ruopora for December, 1913, was very interesting to me, 
since I had made almost exactly the same observations on the related 
species Arenaria (or Moehringia) macrophylla about ten years ago. 
However, my conclusions were somewhat different, for I began to 
look upon the two forms as the two sexes of a dioecious species. The 
form with long stamens and short pistil does not produce seeds, at 
least not in many cases, and its petals are more conspicuous than in 
the other form, which has a longer pistil and short, apparently imper- 
fect stamens. Many specimens of both forms were collected in 1904 
and later distributed.under one number (4033) but with separate 
labels, and the sex: was indicated on the label in each case. My col- 
lection of this plant consists of 17, or if the sexes are kept separate, 
of 20 sheets, collected at nearly as many different places north and 
west of Bingen, Washington, scattered over an area about 30 miles 
wide each way, the altitude varying from 125 to 3000 feet or more. 
Of the 20 specimens 7 are pistillate and 13 are staminate, only one of 
the latter has a conspicuous ovary which, however, may be sterile. 
