SEGREGATES OF CALTHA LEPTOSEPALA. 77 
Caltha imitating as closely as conceivable the two-flowered 
states of C. palustris, even to the broad petals limited to five 
in number. The leaves are almost precisely those of the 
Castalias in their round-sagittiform cut. 
C. LEPTOSEPALA, DC. Syst. i. 310? Hook. Fl. t. x, fig. 
1, doubtless. Basal leaves erect on long and rather slender 
petioles, round-oval, obtuse, with subcordate or subsagittate 
base and short rather open sinus, the margin coarsely and 
somewhat irregularly crenate or crenate-dentate; the cauline 
one smaller, more nearly truncate at base, petiolate, inserted 
about midway of the stem, its stipules lanceolate-subulate, 
not clasping, the node indistinct, the lateral peduncle shorter 
and more slender than the terminal one: sepals 6 to 10, 
oblong-linear, obtuse: filaments linear-filiform, thrice the 
length of the anthers, the whole stamen surpassing the 
rather few pistils: mature carpels substipitate. 
The plant here described answers well to the original 
account given of C. leptosepala, and to Hooker's figure. But 
still its habitat, as far as I can read it in the herbaria, is 
different from that assigned by De Candolle. No such speci- 
mens are in my herbarium, nor in that of the National Mu- 
seum, but there are three sheets of it in that of the Canadian 
Survey at Ottawa, namely, n. 1,251, from mountains south 
of the Zulameen River, B. C., 27 July, 1888, collected by 
Dawson; n. 1,252, Tsi-Tsutl Mountains, B. C., in swamps and 
marshy meadows, 14 July, 1896, by the same; and n. 19,246, 
from Maclennan River, Fraser River, B. C., 31 July, 1898. 
They are all British Columbian specimens, and may there- 
fore not improbably represent the real C. leptosepala. 
€. Macouxr. Size of the last, but leaves smaller, on 
shorter and not erect petioles, more cordate at base, the sinus 
often closed, the margin from entire to repand-dentate or 
shallowly erenate: peduncles several, 1 to 4-flowered, usually 
with a reduced leaf inserted below midway, on a slender 
