. 1919] Fernald,— Arenaria groenlandica and glabra 17 
Bonanza Creek, Dawson, June 12, 1914, Eastwood, no. 204; Dawson 
Slide, Dawson, June 12, 1914, Eastwood, no. 207. Montana: Bald 
Mt., alt. 3050 m., July 22, 1880, S. Watson, no. 54; plains near Cut- 
bank Creek, August 5, 1883, Canby, no. 45. Wyomine: high moun- 
tains, Yellowstone Park, August 13, 1893, J. N. Rose, no. 483. NE- 
vADA: East Humboldt Mts., alt. 3050 m., August, 1868, Watson, 
no. 173. OreGon: on cliffs at 2440 m., Eagle Creek Mts., 1881, 
Cusick, no. 969. WasHINGTON: rocky ridges near snow, at 2440 or 
2740 m., Mt. Paddo, September 15, 1883, Suksdorf, no. 175. 
V. THE SPECIFIC IDENTITY OF ARENARIA GROENLANDICA 
AND A. GLABRA. 
It has been customary to treat the boreal Arenaria groenlandica 
(Retz.) Spreng. and the more southern A. glabra Michx. as distinct 
species, the former extending from Greenland to the higher granitic 
mountains of New England and New York and locally southward 
along the Alleghenies to the mountains of North Carolina, the latter 
confined to the mountains of North Carolina, Tennessee and Georgia. 
'The characters as stated by those who maintain the two as species 
are as follows: ! 
A. GROENLANDICA. Stems 2-8 in. long, 1—5-flowered (Robinson); 
3-20 em. tall, sparingly forked (Small): leaves linear, 15-7 lines 
long, the basal in a dense cluster (Robinson); leaf-blades filiform to 
subulate, 0.3-1.5 cm. long, the basal in a dense cluster (Small): 
pedicels 0.5-1.5 cm. long (Small): sepals broadly ovate, 15-2 lines 
long (Robinson); sepals oblong or oblong-lanceolate, 3-4 mm. long 
(Small): petals obovate (Robinson, Small): capsule subglobose to 
oblong (Robinson); capsule ovoid, or rarely subglobose or nearly 
oblong, 5-6 mm. long (Small). 
A. GLABRA. Stems 6-12 in. high (Robinson); stems 0.5-3 dm. tall, 
often bushy (Small): leaves narrowly linear, equaling or exceeding 
the internodes (Robinson); leaf-blades narrowly linear or nearly 
filiform, 1-2.5 em. long (Small): pedicels elongated (Robinson); 
pedicels 1-4 cm. long (Small): sepals ovate-oblong, 13 lines long 
(Robinson); sepals oblong or ovate-oblong, 2.5-3 mm. long (Small): 
petals spatulate (Small): capsule ovoid (Robinson); capsule ovoid, 
3 mm. long (Small). 
That the specific lines between the two are not satisfactory has long 
been evident from the fact that plants referred by one author to A. — 
1 These characters are taken from the treatments by Robinson in Gray, Synop. Fl. i. 243 
(1897) and by Small, Fl. S. E. U. S. ed. 2, 420 (1913). 
