Flora of North America species comparison

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Filipendula occidentalis

queen-of-the-forest
Habit Plants weakly rhizomatous, 7–15 dm.
Rhizomes

horizontal, stout, 10–15 mm wide, internodes 1–4 cm;

root tubers absent.
Stems

finely puberulent distally.
Leaves

basal 1 or 2, deciduous by flowering;

stipules round, 1–1.5 cm diam., base not auriculate;

lateral leaflets in 1–3 pairs or lacking, remote, ovate to elliptic, to 1 cm, margins serrate;

terminal leaflets round, 6–16 cm diam., palmately 5–7-lobed, lobes ovate to oblong-lanceolate, margins doubly serrate, apex acute to acuminate, surfaces short-appressed hairy at least on veins.
Inflorescences

100+-flowered;

branches and pedicels densely short-appressed hairy, hairs straight.
Flowers

hypanthium nearly flat, saucer-shaped;

sepals (4–)5(–6), green, narrowly triangular, 4–6 mm, margins often serrate, usually with midrib, abaxially puberulent, adaxially glabrous;

petals (4–)5(–6), white, in buds sometimes marginally pink, oblanceolate, 10–15 mm, not clawed, base broad, margins entire;

stamens white, about equal to petals.
Achenes

7–12, flattened, lanceolate, straight, 6–7.5 mm, sutures densely ciliate, faces sparsely hairy;

stipes 1–2 mm;

styles 1.5–2 mm.

Filipendula occidentalis
Phenology Flowering summer (Jun–Aug).
Habitat Wet, mossy rock along forest streams, at or slightly above water level, wet rock on mountain slopes, riverbanks, rocky summits
Elevation 30–1000 m (100–3300 ft)
Distribution
from FNA
OR; WA
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

Filipendula occidentalis is known only from the valleys of several small rivers in the coast ranges of northwestern Oregon and southwestern Washington. The species is threatened by logging and associated forest-management activities. The species is most probably related to F. camtschatica (Pallas) Maximowicz from the Pacific coast of Asia.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 25.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Ulmarieae > Filipendula
Sibling taxa
F. rubra, F. ulmaria, F. vulgaris
Synonyms Spiraea occidentalis, S. camtschatica var. occidentalis
Name authority (S. Watson) Howell: Fl. N.W. Amer., 185. (1898)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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