R. Brown, Chlor. Melvill. 9, plate A. 1823.
(Rollins) W. A. Weber;
simple or few from caudex, erect, unbranched, (0.3-)0.8-3 (-4.5) dm.
(soon withered); rosulate; petiole 1-4.5(-6) cm; blade (somewhat fleshy), ovate, lanceolate, or oblong, (0.3-)0.8-2(-2.5) cm × (1-)4-14(-18) mm, (base truncate, obtuse, or cuneate, sometimes oblique), margins entire, apex obtuse.
3-7(-10); petiolate or (distal) sessile; blade ovate, lanceolate, oblong, or linear, (0.7-)1-3(-4) cm × (1-)3-10(-14) mm, base cuneate, margins entire, apex subacute.
considerably elongated in fruit.
divaricate to ascending, (curved-ascending or straight), (1.5-)3-10(-15) mm.
sepals ovate, 1.5-3 × 1-1.5 mm, (margins membranous); petals spatulate, 3-5 × 1.5-3 mm; filaments 2-2.5 mm; anthers ovate, 0.2-0.4 mm; gynophore usually 0.2-1 mm, rarely obsolete.
stipitate, not torulose, linear to narrowly oblong, (0.7-)1-2(-2.5) cm × 2-3 mm slightly 4-angled; valves (cuneate basally and distally), each with prominent midvein; septum mostly perforate; ovules (6-)8-12(-14) per ovary; style 0.2-1 mm.
usually oblong, rarely ovoid, (1.5-)2-3 × (0.7-)1-1.5 mm.
= 18, 28, 42, 56.
Flowering early Jun-early Aug, fruiting Jul-early Sep. Tundra, talus slopes, glaciated hills, grassy margins of streams, wet areas of peat ridges; 0-3900 m; Greenland; B.C., N.W.T., Nunavut, Que., Yukon; Alaska, Colo.; Asia (Mongolia, Russia).
from Alaska, northern Canada, and Greenland grow at elevations of 0-1900 m; those of Colorado, treated by R. C. Rollins (1993) as
, grow at 3700-3900 m.
An examination of collections of
from its entire range amply demonstrates that it is a highly variable species that can easily accommodate
Although the latter is known from the high mountains of Park County (Colorado), its plants are indistinguishable from those of
from Greenland, and the higher latitudes in Alaska, British Columbia, Northwest Territories, Nunavut, and Yukon. In general, plants of
from lower latitudes tend to be far more robust than those of higher latitudes. R. C. Rollins (1993) indicated that
is distinguished from
by having stems less than 10 (versus 10-45) cm, lingulate (versus obovate) petals, fruiting pedicels less that 4 (versus 5-10) mm, infructescence less than 5 (versus to 20) cm, and cordate (versus truncate or cuneate) basal leaves. In fact, the petals of
are spatulate, just as those of most plants of
, and the basal leaves in
, both at GH) are cuneate. Furthermore, some plants from Greenland (e.g.,
Raup et al. 465
, GH) are almost identical to those of
, and they are only 3-8 cm with narrowly obovate petals, fruiting pedicels 2-4 mm, and infructescence 2-3 cm. Other examples of
that show some or all of the above aspects of
could be cited. Weber treated
as a subspecies of
, but the only difference I see between the two is geographic. Such distinction is unacceptable because the widely disjunct populations of
within Russia would have to be treated that way too.
Eutrema penlandii, E. edwardsii
is in the Center for Plant Conservation's National Collection of Endangered Plants.