268 NORTH AMERICAN FLORA [VoLuME 22 
Thecanisia purpurea [‘‘ ponpurea” } Nae New FI. 2: 38. 1837. 
Thecanisia augustifolia Raf. New Fl. 2: 39. 1837. 
Filipendula lobata Maxim. Acta Hort. ee 6: 251. 1879. 
Spiraea rubra Britton, Bull. Torrey Club 18: 270. 1891. 
Stem 0.5-2 m. high, grooved, tinged with red, glabrous; leaves large, the lower some- 
times 1 m. long, pinnately divided into 3-9 segments, dark-green and glabrous above, more 
or less pubescent beneath; terminal segment reniform in outline, 1-2 dm. wide, 5-9-cleft 
with lanceolate double-serrate lobes; lateral segments obovate in outline, digitately 3-S- 
lobed, 5-12 cm. long, the intermediate segments minute; inflorescence flat-topped or ovate ; 
sepals ovate, obtuse; petals pink or purple; blades orbicular, 3-3.5 mm. broad; achenes 
about 10, lance-oblong, 4-5 mm. long, slightly-flattened, straight, tapering at each end, ses- 
sile or nearly so, fixed by the base; seeds oblong; style slightly curved; stigma capitate. 
TYPE LOCALITY : North America. 
DISTRIBUTION : In moist ground from Vermont to Pennsylvania, Iowa, Kentucky, and Georgia. 
fl ILLUSTRATIONS : Hill, Hort. Kew. pl. 7; Jacq. Hort. Vind. 1: f/. 88; Britt. & Brown, Ml. Fl. 
. 1953. 
5. Filipendula kamtschatica (Pall.) Maxim. Acta Hort. Petrop. 
6: 248. 1871. 
Spiraea kamischatica Pall. Fl. Ross. 1: 41. 1784. 
Stem tall, 1m. high or more, angled, glabrous below, more or less pubescent above ; 
leaves pinnately divided, but the terminal segment large and the lateral ones minute, gla- 
brous or nearly so above, more or less pubescent beneath; terminal segment cordate or ren- 
iform, 1-2 dm. broad, digitately 3-7-cleft with ovate or lanceolate, more or less acuminate 
and double-serrate lobes ; inflorescence flat-topped ; petals white; blades orbicular or nearly 
so, 2-2.5 mm. long; achenes about 5 in number, 6-7 mm. long, distinctly stipitate at the 
base, lance-linear, very flat, ciliate on the sutures, otherwise glabrous; seed oblong; styles 
slender, almost straight; stigma capitate. 
TYPE LOCALITY : Kamchatka. 
DISTRIBUTION : Kamchatka, Sachalin, Manchuria, Japan, and the western Aleutian Islands. 
ILLUSTRATION: Pall. Fl. Ross. 1: pé. 28. 
6. Filipendula occidentalis (S. Wats.) Howell, Fl. NW. Am. 
1: 185. 1898. 
Spiraea occidentalis S, Wats. Proc. Am. Acad. 18: 192. 1883. 
Stem 1-2 m. high, simple, nearly terete, straw-colored, glabrous below, pubescent above ; 
leaves pinnately divided, with a large terminal division and small lateral ones, more or less 
hairy on both sides, especially on the veins; terminal segment cordate or reniform, 1-1.5 
dm. broad, digitately 3-7-cleft with ovate, acute, double-serrate lobes; lateral segments 1-2 
pairs, ovate to lanceolate, 5-10 mm. long, toothed ; inflorescence flat-topped ; *sepals lanceo- 
late, 2 mm. long, acute; petals elliptic or oval, almost clawless, white, about 6 mm. long; 
achenes long-stipitate, the stipes almost equaling the bodies, the latter linear-lanceolate, cil- 
iate on the margins and more or less hairy on the sides; styles slender, straight. 
TYPE LOCALITY: Rocky banks of the Trask River, Tillamoak County, Oregon. 
DISTRIBUTION : Western Oregon. 
Tribe 7. POTENTILLEAE. Mostly perennial herbs, with scaly rootstock 
or caudex, a few annuals or biennials, only the genus Dasiphora shrubby and 
Sibbaldiopsis suffruticose. Leaves pinnate or digitate, with persistent stipules. 
Inflorescence mostly cymose, but in Dasipbhora, Argentina, Duchesnea and a 
few species of Potentilla, the flowers are solitary and axillary. Hypanthium 
from flat and poorly developed, almost obsolete, to deeply campanulate. Disk 
usually poorly developed. Sepals subtended by a set of bractlets of the same 
number, except in Chamaerhodos and Purpusia. Pistils from one to many; 
ovules solitary, inserted at the distal end of the ovary. Fruit achenes; seeds 
