Flora of North America species comparison

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Trollius albiflorus

American globe-flower, globeflower, western globeflower, white globe-flower
Stems

0.7-5.5 dm (to 8dm in fruit), base with few petioles persistent from previous year.
Leaves

basal leaves with petioles 4-25 cm, some leaves reduced to sessile, ovate membranous scales;

cauline leaves 1-3(-5), with broad, clasping, membranous sheaths.
Flowers

2.5-5 cm diam.;

sepals 5-9, spreading, white when fresh (pale yellow to greenish white before anthesis), ovate to obovate or nearly orbiculate, 10-20 mm;

petals 15-25, yellow, 1/2-2/3 length of stamens when pollen shed, 3-6 mm.
Follicles

usually 11-14, 8-16 mm including beak;

beak often somewhat recurved, sometimes straight.
2n

=16.

Trollius albiflorus
Phenology Flowering summer.
Habitat Open, wet places, ±acidic, montane to alpine
Elevation 1200-3800 m (3900-12500 ft)
Distribution
from FNA
CO; ID; MT; UT; WA; WY; AB; BC
[WildflowerSearch map]
Discussion

The diploid Trollius albiflorus is isolated from the tetraploid T. laxus ecologically, geographically, and reproductively, although it often has been treated as a variety of the latter.

Identities of specimens of Trollius albiflorus and the superficially similar Anemone narcissiflora subsp. zephyra in Colorado and Wyoming are sometimes confused. Close examination reveals a number of differences. The anemone has sepals yellow (not white), leaf blades and flowering stems pilose to villous (not glabrous), achenes (not follicles), and leaflike bracts subtending the pedicels and whorled (leaves alternate in Trollius).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 3.
Parent taxa Ranunculaceae > Trollius
Sibling taxa
T. laxus, T. riederianus
Synonyms T. laxus var. albiflorus
Name authority (A. Gray) Rydberg: Mem. New York Bot. Gard. 1: 152. (1900)
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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