188 Rhodora [NOVEMBER 
PoLyconum acadiense, n. sp., annuum prostratum paulo vel vix 
glaucum rubro-viride, caulibus gracilibus, internodiis 1.5-3.5 cm. 
longis; ochreis internodo multo brevioribus 1-1.3 cm. longis albido- 
hyalinis basi purpurascentibus remote circa 6-nerviis ovato-oblongis 
acutis adpressis demum bipartitis lacerisque; foliis lineari-oblanceo- 
latis acutis submembranaceis subtus l-nerviis, primariis 2-4.5 cm. 
longis 2-7 mm. latis petiolo 3-8 mm. longo; axillis 1—3-floris; pedi- 
cellis calycem subaequantibus apice valde articulatis; calyce 4 mm. 
longo turbinato-campanulato profunde 4-5-partito, lobis oblongis 
obtusis subaequalibus margine albido- vel roseo-petaloideo basi non 
angustatis; achenio olivaceo lucido ovato-lanceolato 6 mm. longo 
2-3 mm. lato a calyce arcte amplectente valde exserto. 
Annual, prostrate, slightly or scarcely glaucous, reddish-green; 
the stems slender; the internodes 1.5-3.5 em. long: ochreae much 
shorter than the internodes, 1-1.3 em. long, white-hyaline, purplish 
at base, remotely about 6-nerved, ovate-oblong, acute, appressed, 
finally 2-parted and lacerate: leaves linear-oblanceolate, acute, sub- 
membranaceous, 1-nerved beneath; the primary 2-4.5 em. long, 2-7 
mm. wide, with petiole 3-8 mm. long: axils 1-3-flowered: pedicels 
about equaling the calyx, obviously articulated at apex: calyx 4 mm. 
long, turbinate-campanulate, deeply 4-5-parted; the lobes oblong, 
obtuse, subequal, with white- or roseate-petaloid margin, not narrowed 
at base: achene olivaceous, shining, ovate-lanceolate, 6 mm. long, 
2-3 mm. wide, closely invested by the calyx, conspicuously exserted.— 
Nova Scotia: gravelly strand of Bras d'Or Lake, Grand Narrows, 
Cape Breton, July 20, 1914, Fernald & St. John, no. 11,042 (TYPE in 
Gray Herbarium). 
Nearest related to P. Rati which has much more glaucous mostly 
oblong-lanceolate leaves, shorter ochreae (3-8 mm. long) with brown- 
ish rather than purple bases, much more petaloid and broader less 
appressed oval overlapping sepals and shorter broader and darker 
achenes (4.5-5.3 mm. long, 3-3.5 mm. broad). On the strand at 
Grand Narrows P. acadiense and P. Raii were growing together. The 
material of P. Rai, collected and pressed at the same time as the other, 
remained in press several weeks and lost essentially no foliage; but the 
material of P. acadiense was completely dry in five days and many of 
its leaves had disarticulated. 
P. acadiense has the calyx and the olivaceous exserted achene 
similar to those of P. Fowleri Robinson, but in that species the achene 
is very broadly ovate and only 4 mm. long; the more fleshy short 
leaves are elliptic to broadly oblanceolate, with rounded tips; and the 
broad flaring obscurely nerved ochreae are only 3-6 mm. long. 
In the form of its sepals and achenes P. acadiense is similar to P. 
