Flora of North America species comparison

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Geum calthifolium

caltha-leaf avens
Habit Plants subscapose.
Stems

8–40 cm, sparsely hirsute proximally, puberulent throughout.
Leaves

basal 5–25 cm, blade strongly lyrate-pinnate, sometimes simple, major leaflet 1, minor leaflets 1–7, terminal leaflet much larger than minor laterals;

cauline 1.5–4.5 cm, stipules not evident, blade bractlike, not resembling basal, simple.
Inflorescences

1–2(–4)-flowered.
Pedicels

downy, hirsute, eglandular.
Flowers

erect;

epicalyx bractlets 2–6 mm;

hypanthium green or green with slight maroon tinge;

sepals erect-spreading, 6–11 mm;

petals spreading, yellow, obcordate-obdeltate to nearly orbiculate, 9–13 mm, longer than sepals, apex broadly and shallowly emarginate.
Fruiting tori

sessile, glabrous.
Fruiting styles

wholly persistent, not geniculate-jointed, 9–14 mm, apex not hooked, pilose in basal 3/4, eglandular.
2n

= 42.

Geum calthifolium
Phenology Flowering summer.
Habitat Muskegs, moist meadows, heathlands, moist sites on rocky slopes, ledges, and cliffs
Elevation 0–1500 m (0–4900 ft)
Distribution
from FNA
AK; BC; e Asia (Russian Far East)
[BONAP county map]
Discussion

Geum calthifolium hybridizes with G. rossii [= G. ×macranthum (Kearney ex Rydberg) B. Boivin]; see discussion under 4. G. schofieldii.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 64.
Parent taxa Rosaceae > subfam. Rosoideae > tribe Colurieae > Geum
Sibling taxa
G. aleppicum, G. canadense, G. geniculatum, G. glaciale, G. laciniatum, G. macrophyllum, G. peckii, G. radiatum, G. rivale, G. rossii, G. schofieldii, G. triflorum, G. urbanum, G. vernum, G. virginianum
Name authority Smith: in A. Rees, Cycl. 16: Geum no. 13. (1810)
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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