Geranium bicknellii (Bicknell's Cranesbill)

Plant Info
Also known as: Northern Cranesbill
Genus:Geranium
Family:Geraniaceae (Geranium)
Life cycle:annual
Origin:native
Habitat:sun; dry sandy or gravelly soil; gravel pits, rock outcrops, clearings
Bloom season:May - September
Plant height:8 to 12 inches
Wetland Indicator Status:none
MN county distribution (click map to enlarge):Minnesota county distribution map
National distribution (click map to enlarge):National distribution map

Pick an image for a larger view. See the glossary for icon descriptions.

Detailed Information

Flower: Flower shape: 5-petals

[photo of flowers] Flowers are about 1/3 inch across with 5 oblong to egg shaped petals, slightly notched at the tip, white to pinkish lavender with darker lines radiating from the base. The 5 sepals are oval-elliptic with a conspicuous sharp awn at the tip and are hairy on the outer surface; including the awn they are as long as or a little longer than the petals. Flowers are typically borne in pairs, each on a ¾ to 1 inch stalk (pedicel) that splits off at the tip of another ¾ to 1 inch stalk (peduncle) arising from the leaf axils and at the tips of growing branches. New flowers develop continuously through the growing season.

Leaves and stems: Leaf attachment: alternate Leaf attachment: opposite Leaf type: lobed Leaf type: palmate Leaf type: simple

[photo of leaves] Leaves can be alternate but are mostly opposite on stalks up to 2 inches long. The blade is nearly round in outline, up to 3 inches across, hairy on both surfaces, deeply cleft into 5 (typical) fingerlike lobes that are generally wedge shaped at the base and fan out in their upper half, these lobes further lobed with rounded or blunt tips.

[photo of stem, leaf node and stipules] At the base of the leaf stalk is a pair of short, very narrow, sharply pointed, leafy appendages (stipules). Stems are sparsely hairy, spreading to erect with many ascending branches, spreading out to 3 feet across, and are often tinged red. Branches are swollen at the base, leaf stalks slightly so.

Fruit: Fruit type: capsule/pod

[photo of fruit] Fruit is an erect capsule-like structure about 1 inch long with the persistent sepals around the base. In the center is a slender column divided into five sections, each attached at its base to an oval shaped carpel containing a single seed.

[photo of emptied carpels] At maturity, the sections split apart from the base along the seams, causing the dried carpels to spring up and eject the seeds away from the mother plant.

Notes:

The native Bicknell's Cranesbill can be distinguished from the non-native Siberian Cranesbill (Geranium sibiricum) by its 2 flowers per cluster and its narrower, more fan-like leaf lobes that have blunt or rounded tips. The leaf lobes of G. sibiricum are more broadly lance elliptic, have sharply pointed tips, and the flowers are nearly always single in the leaf axils on proportionately longer stalks. The native Carolina Cranesbill (G. carolinianum) also has 2 flowers per stalk but they are more densely clustered at the branch tips and are nearly stalkless, creating more of a flat-topped cluster. Distribution range can also be a good indicator. G. bicknellii is predominantly found in northern boreal forests where it responds to disturbances in forest openings, such as lumbering and fire. With only a few exceptions G. carolinianum is almost exclusively found in the western and southern prairie regions, especially in and around rock outcrops.

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More photos

Photos by K. Chayka taken in Carlton, Hubbard and Ramsey counties. Photos courtesy Peter M. Dziuk taken in Carlton County.

Comments

Have you seen this plant in Minnesota, or have any other comments about it?

Posted by: Susan - Southeastern Dakota Cty
on: 2015-11-16 11:47:44

I think we have these in woods behind our house and also in yard, but I don't see them on the MN County Distribution Map. Could it be a different geranium? Also, what does "adventive" mean? Thank you!

Posted by: K. Chayka
on: 2015-11-16 13:15:56

Susan: many plants, particularly non-native species, are under-reported in the state. Someone (even you) could collect a specimen and submit it to the Bell Herbarium for the official county records. A positive ID is required first, however. BTW, "adventive" is a species not native to MN (though could be elsewhere in the country) but is not yet completely naturalized. Populations tend to not spread far and wide like an invasive species would and may not even persist more than a few years.

Posted by: Marisa - Lake County
on: 2017-07-05 13:30:41

Saw this up near Silver Creek - it was my first time seeing this flower, and your description of the number of flowers and length of stalks helped me distinguish it from similar tiny geraniums. It's so sweet and pretty. I only saw one, but I hope to see more!

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