teolar calvx-segments very small. Receptacle villous. Achenia very glabrous.—
The var. y. of which Mr. Nuttall collected but a single specimen,
not quite in flower, will probably prove to be a distinct species, as the discoverer
supposes.
6- T*. Pennsylvanica (Linn.): stem erect; softly tomentose or rather villous
; leaves pinnately 5-9-foliolate, canescently tomentose, as also the peduncles
and calyx; leaflets oblong, obtuse, pinnatifid or pinnately incised;
the superior ones larger, often confluent at the base, and mostly crowded;
the inferior pair often very small; stipules entire or incised ; cyme at length
dichotomous and expanded, fastigiate ; petals roundish-obovate, emarginate,
slightly exceeding the rather acute segments of the calyx.—Linn.! mant. p.
76; Jacq. hort. Vindob. 2. t. 189 ; Willd.! spec. 2. p. 1099 ; Michx.! fl. l.
p. 304 ; Pursh, ji. 1. p. 356.
a. communis .* leaflets almost glabrous above when old, with elongated
lanceolate rather spreading latinise; the lowest ones rather distant, very
small, entire or toothed.—P. Pennsylvanica, Lehm.! Pot. p. 55, Sfin. Hook.
1. c. 1. p. 188 ; and of authors. P. Missourica, Hornem.; Bot. reg. t. 1412.
/?. strigosa (Pursh!): smaller; leaflets mostly tomentose on both surfaces,
deeply pectinate-pinnatifid ; the segments linear, with revolute margins, entire;
stipules laciniate.—P.'pectinata, Fischer. P. absinthiifolia, JJougl. !
mss. P . holosericea, Nutt. ! mss. P. Pennsylvanica, /?. strigosa, Lehm.! 1. c.
_ y. bipinnatifida: leaflets crowded (3—5) and often almost palmate, deeply
pinnatifid (silky-pubescent but not canescent above); the segments linear,
elongated, mostly spreading.—P. bipinnatifida, Hougl. ! in Hook. 1. c. P.
arguta, Lehm.! 1. c., not of Pursh.
<j* pulcherrima: leaflets much crowded (the lower minute ones wanting),
elliptical-oblong, pinnatifid-serrate, with lanceolate-oblong scarcely spreading
teeth (silky-pubescent or nearly glabrous above); stipules mostly entire.
—P. pulcherrima, Lehm. ! 1. c.
t. Hippiana: leaflets narrowly oblong, approximate but scarcely crowded
(silky above, silvery-canescentbeneath), pinnatifid-serrate; the teeth slightly
spreading, connivent when young; stipules ovate or lanceolate, entire or
somewhat toothed.—P. Hippiana, Lehm.! stirp. pug. 2. p. 7, Sf in Hook.
L c., t. 64. P. leucophylla, Torr. ! in ann. lyc. New York, 2. p. 197, not of
Pallas. P. dealbata, Hougl.! mss. not oiLedeb.
Canada! and throughput British America to Kotzebue’s Sound! Also a
native of Siberia; but not found within the limits of the United States east
of the Mississippi. 0. Rocky Mountains to lat. 42°, Nuttall! On the Missouri,
Bradbury ! y. Saskatchewan! &c. <J. & *. Saskatchewan ! and in
the Rocky Mountains to the sources-of the Platte, Hr. James !—We know
not whether the botanists who have paid greatest attention to this genus will
coincide with our views respecting the species here united with P. Pennsylvanica
; but the examination of an extensive series of specimens Seems inevitably
to lead to this result. The stems are usually several from the
same root, 1-2-feet high.
7. P. rubricaulis (Lehm.): stem ascending; leaves digitate-pinnate ; the
radical ones 5-foliolate, the cauline 3-!olioiate; leaflets oblong, approximate,
pinnatifid-serrate, glabrous above, tomentose beneath; stipules entire ; petals
obcordate, rather longer than the calyx; receptacle. somewhat glabrous.
Lehm. ! 1. c., Sfin Hook. jl. Bor.-Am. 1. p. 191.
About Bear Lake in lat. 66, Richardson.—Stems a foot high, pubescent,
purplish. Lacini* of the leaflets linear-lanceolate, obtuse. Segments of
the calyx ovate-lanceolate, twice the size of the bracteoles.—We have not
examined this species. It appears to be nearly related to P. pulcherrima of
the same author.
8. P. Hrummondii (Lehm.) : stem herbaceous, nearly erect, la x ; radical
leaves irregularly and somewhat verticillately pinnate, 7—11-foliolate ; the
cauline 5-foliolate ; leaflets obovate, truncate, cuneiform at the base, deeply
incised, nearly glabrous, ciliate ; stipules (large) ovate, entire ; petals obcordate,
veiny, twice the length of the calyx. Lehm.! 1. c., 8f in Hook. Jl.
Bor.-Am. 1. p. 189, t. 65.
Alpine woods in the Rocky Mountains north of the Smoking River, in lat.
56°, scarce. Hrummond! (v. sp. in herb. Hook.)—Stem l j foot high, somewhat
hairy, few-leaved. Radical leaves on long petioles ; those of the stem
I - 3, distant, on short petioles. Flowers somewhat panicled at the summit
of the stem: pedicels long and slender, very hairy towards the summit.
Lehm.
9. P. Plattensis (Nutt.! mss.): “ stems decumbent, clothed, as well as
the leaves, with minute strigose appressed hairs ; radical leaves pinnately 7—
II - foliolate; the cauline (about 2) 3-5-foliolate; leaflets cuneiform, deeply
pinnatifid-incised, the segments oblong or linear; those of the cauline leaves
much crowded ; stipules large, broadly ovate, entire; panicle few-flowered,
the pedicels elongated; petals obcordate, a little longer than the acuminate
calyx-segments.”
Plains of the Platte ; common, Nuttall !—Stems 6-12 inches high,
weak. Mr. Nuttall compares this species with P. diversifolia, which it
indeed resembles,, but is very distinct. It is, judging from the figure,
much more nearly allied to P. Drummondii, but is a smaller plant, the pedicels
are not clothed with long bristly hairs, and the flowers are smaller.
10. P. diversifolia (Lehm.) : more or less silky-pubescent with long
white hairs ; stems ascending; radical leaves 5-7-foHolate ; the cauline sub-
sessile (1—2), 3-5-foliolate; all either pinnate with the leaflets much crowded,
or pedate, or even palmate ; leaflets unequal, cuneiform, incisely toothed or
lobed, the lobes silky-villous at the apex ; stipules ovate-lanceolate, entire ;
flowers few or several, on very long divaricate or erect pedicels; petals
obcordate, nearly twice the length of the calyx.—Lehm.! 1. c. Sfin Hook.
Jl. Bor.-Am. 1. p. 190. P. glaucophylla, Lehm. delect, sem. Hamb. 1836 ?
P. campestris, Nutt.! mss. P. dissecta ? Nutt, in jour. acad. Philad. 7.
p. 20, fide Nutt.
Alpine prairies, as well as the higher summits of the Rocky Mountains
between lat. 52°- & 56°, Hrummond 1 Plains of the first chain of the
Rocky Mountains called the Black Hills, frequent, Nuttall!—Stems 3-12
inches high, many from the same root. Radical leaves on long petioles.
Flowers pretty large.—Tjie same specimen frequently presents both pinnate
and completely palmate leaves : they are all palmate in our specimens of
P. campestris, Nutt, and of P. glaucophylla, Lehm., but we-observe no
other difference.
11. P. pulchella (R. Rrown) : dwarf; stems procumbent, about 1-
flowered ; leaves pinnately 3—5-foliolate, silky-tomentose beneath; leaflets
pinnatifid, the lower pair smaller and often entire; the lobes lanceolate-
linear ; stipules sheathing ; petals rather longer than the calyx.—R. B r .!
in Ross's voy., Sf in Parry's lsf voy. suppl. p. 277 ; Hook.! in Parry's 2nd
voy. Sf jl. Bor.-Am. 1. p. 191. P. sericea, Greville, ex R. Br.
Islands of the Arctic S e a ! Arctic shore between the Mackenzie &
Coppermine Rivers, Richardson !—The style, which is said to be “ basi
glanduloso-dilatato,” has the same structure with numerous species of this
section.