1917] Fernald,— A new Juncus from Cape Cod 17 
never more than scabrous above, the almost wholly glabrous rachis, 
the fewer-flowered and smaller spikelets and in the glumes which 
are acutish or short-mucronulate instead of acuminate. It also 
somewhat resembles A. pungens (Pers.) R. & S. from which it differs 
in the narrower, more involute and slightly shorter leaves, the less 
dense and not four-sided inflorescence and the fewer-flowered, some- 
what less compressed spikelets. 
Boston, MASSACHUSETTS. 
A NEW JUNCUS FROM CAPE COD. 
M. L. FERNALD. 
Juncus pervetus, n. sp., radicibus, rhizoma, culmis et foliis ut apud 
J. Roemerianum; culmis teretibus vel compressis rigidis rectis vel tortis 
0.6-1 m. altis; inflorescentiis terminalibus vel pseudolateralibus 
supra compositis 2.5-10 cm. longis 2.5-6.5 cm. diametro, ramis rigide 
adscentibus vel divergentibus; capitulis 10-30-floris subsphaericis 
segregatis; floribus circa 2 mm. longis interdum unisexualibus; 
sepalis petalisque subaequalibus pallide fuscis vel albescentibus ob- 
longis obtusis membranaceo-marginatis, sepalis subcarinatis; stami- 
nis 6 interdum abortivis, filamento antheram aequante; fructo exserto 
3 mm. longo ovato-prismatico subulato-attenuato nitido stramineo vel 
rufescente, placentis non crassatis; seminibus 0.4-0.6 longis anguste 
obovoideis apice obtuse mucronatis basi breviter albido-caudatis. 
Roots, rhizome, culms and leaves as in J. Roemerianus: culms terete 
or compressed, rigid, erect or twisted, 0.6-1 m. high: inflorescences 
terminal or falsely lateral, much branching, 2.5-10 em. long, 2.5-6.5 
cm. in diameter; branches rigid, ascending or divergent: heads 10- 
30-flowered, subspherical, scattered: flowers about 2 mm. long, some- 
times unisexual: sepals and petals subequal pale-fuscous or whitish, 
oblong, obtuse, with membranaceòus margins; sepals somewhat 
carinate: stamens 6, sometimes wanting; filaments equaling the 
anthers: fruit exserted, 3 mm. long, ovate-prismatic, subulate-atten- 
uate, shining, stramineous or rufescent; the placentae not thickened: 
seeds 0.4-0.6 mm. long, narrowly obovoid, bluntly mucronate at 
apex, with a short white caudate appendage at base.— MASSACHU- 
SETTS: brackish swale, Hyannis, August 29, 1909, E. W. Sinnott 
(distributed as J. articulatus, var. obtusatus); forming a dense swale 
for a few rods only at the peaty upper border of a brackish marsh, 
east side of Lewis Bay, Yarmouth, October 14, 1916, M. L. Fernald & 
F. K. Butters, no. 15,064 (TYPE), also in Plantae Exsiccatae Grayanae. 
