SIBBALDIA. ROSACEZ. 175 
POTENTILLA. 
10 SIBBALDIA L. Gen. n. 393.. 
-Procumbent or depressed suffruticose plants with trifoliolate 
leaves and rather small flowers on scape-like peduncles. Calyx 
rather flat, 5-cleft and 5-bracteolate. Stamens 5, alternate with 
the 5 petals, inserted into the margin of the villous disk which 
lines the base of the calyx; filaments short. Carpels 5-10, raised 
on short hairy stipes; styles lateral, attached near the base of 
the ovary; stigma capitate, depressed. Seed ascending, amphi- 
tropous. Radicle superior. 
‘S. procumbens L,. Sp. 284. Somewhat villous: stems creeping, leafy at 
the extremities: leaves trifoliolate; leaflets cuneiform, 3-12 lines long, 3-5 
toothed at the apex: calyx-lobes 1-2 lines long; bractlets linear and shorter : 
petals much shorter, acute. Alpine and subalpine, from the Arctic 
regions to California and the Rocky Mountains: Greenland, Labrador 
and the White Mountains of N. H., Nerthern Europe. 
11 POTENTILLA L. Gen. n. 634. 
Herbaceous or suffruticose plants with pinnately or palmately 
compound leaves, adnate stipules and axillary or cymous inflor-— 
escence. Calyx concave at the bottom, deeply 4—5-cleft, with 
4—5 alternate bractlets. Petals 4-5, obtuse or retuse or obcord- 
ate, deciduous. Stamens numerous, inserted into the margin of 
the disk which lines the base of the calyx: filaments filiform or 
subulate. Carpels numerous 1-ovuled, collected into a head on 
the flattish persistent dry villous receptacle: styles lateral or 
nearly terminal, deciduous: stigmas obtuse or somewhat capi- 
tate: ovule always inserted next the insertion of the style and 
accordingly either suspended or ascending. Radicle always su- 
perior. 
7 § 1 Styles: thickened and glandular toward the base: carpels 
glabrous, numerous, sessile: inflorescence cymose. 
* Style attached below the middle of the ovary: disk thickened 
and pentagonal; stamens 20-30, in one row on the margin of the 
disk; herbaceous perennials with pinnate leaves and glandular-vil- 
lous pubescence. 
P. glutinosa Nutt.T. & G. Fl. i, 446, under P. fissa var. Stems stout, 
erect, simple, striate, 1-4 feet high: radical leaves 7-11-foliolate 4-12 
inches long, usually long-petioled; stipules ovate, entire or incised; leaf- 
lets rounded or subrhomboidal, incised or densely serrate, the terminal 
one 1-3 inches long: inflorescence loosely and regularly dichotomous, 
forming an almost flat-topped cyme 6-8 inches broad in fruit; calyx 
densely pubescent, the acute sepa‘s 3-4 lines long; bractlets much smaller; 
petals rounded obtuse, 3-5 lines long, clear yellow: achenes very broadly 
oblique-ovoid, obtuse, distinctly carinate on the back above the middle, 
the sides marked with numerous rather coarse simple or forked veins. 
On stony hills, Vancouver Island to Oregon and Idaho. 
-P. ciliata. Loosely pilose throughout: stems cespitose, slender, 
10-12 inches high, from short creeping ~rootstocks: radical leaves 4-6 
inches long; stipules linear to obovate, 4-6 lines long, more or less lacer- 
ate; leaflets 5-9, with 2-6 smail ones interspersed, mostly obovate with 
cuneate base, 4-12 lines long, coarsely lacerate toothed: flowers large, in 
a rather close corymbose cyme; sepals ovate, acuminate, 4-6 lines long, 
