MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 39 
and petals generally only 4; bractlets and sepals lanceolate, subequal ; petals obcordate. Otherwise 
as in P. Canadensis. 
A native of Europe, which has been collected in Labrador. 
Labrador: Collector not given. (The specimen was sent to Dr. Gray by Hooker. ) 
11. Potentilla longipedunculata. 
Perennial by a creeping rootstock. Stems 4-5 dm. high, ascending, villous with 
long silky white hairs, rather weak and dichotomously branched, with solitary long- 
pedicelled flowers in the axils of the branches. Stipules rather large, about 2 em. long, 
oblong-lanceolate ; leaves digitately 3-5-foliolate, slightly silky and green above, densely 
white-tomentose beneath, with slender petioles 4-6 em. long; leaflets oblanceolate, 3-9 
em. long, dissected halfway to the mid-rib into oblong lanceolate divergent segments. 
Pedicels solitary in the axils of the branches, almost 1 dm. long, slender, silky-villous 
with spreading long hairs. Flowers 2 cm. in diameter ; sepals and bractlets subequal, ob- 
long-lanceolate, almost equalling the broadly cuneate yellow petals; stamens about 20; 
pistils very few; receptacle unusually hairy, style filiform but not very slender. 
The form and the pubescence of the leaflets are almost identical with those of 
P. gracilis. Tt may be a form of that plant produced in a rich, shaded situation and was 
so regarded at first by me, but as the likeness is limited to the pubescence and the form 
of the leaves, I have come to the conclusion that it is better to describe it as a distinct 
species. The most important characters by which it is distinguished from P. gracilis 
are: the slender ascending stem, which is dichotomously branched, with a long-pedi- 
celed flower in the axils; the longer and sub-equal bractlets and sepals; the cuneate, 
scarcely at all emarginate petals; the long spreading hairs of the stem, petioles and 
pedicels, and the small number of pistils. 
The type was collected by Susie Howell at Monmoth, Oregon, in 1895. It is pre- 
seryed in the herbarium of the Experiment Station at Pullman, Washington. 
§3. HETEROSEPALAE. 
12. Potentilla heterosepala Fritsch. 
Potentilla heterosepala Fritsch, Bot. Jahrb. 11: 314. 1890; J. D. Smith, Bot. Gaz. 18: 2. 
Potentilla Donnell-Smithii Focke, Bot. Gaz. 16: 3. 1891. 
Perennial; stems several, 4-5 dm., leafy, slender, decumbent, strigose and slightly glandular. 
Basal leaves numerous, pinnate, of 1-2 pairs of cuneate-obovate or broadly obovate, subincised-crenate 
leaflets, pilose on both sides, the terminal slightly stalked ; stem leaves ternate. Inflorescence leafy ; 
hypanthium hirsute ; bractlets 3-cleft, seldom entire, oblong-elliptic, obtuse ; sepals triangular, acute ; 
petals cuneate-obovate, emarginate, half longer than the sepals or more ; flowers 1 cm. in diameter. 
