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Long-lobed Arrowhead (Sagittaria montevidensis ssp. calycina)

Life history

Species overview

Long-lobed Arrowhead (Sagittaria montevidensis ssp. calycina), a Wisconsin Special Concern plant, is found on the muddy shores of sloughs and in the backwaters of the lower Mississippi and Wisconsin Rivers. Blooming occurs late July through early August; fruiting occurs late August through early September. The optimal identification period for this species is late August through early September.

Synonyms: Lophotocarpus calycinus, Lophotocarpus californicus, Lophotocarpus depauperatus, Sagittaria calycina, Sagittaria calycina var. calycina


  • Distinguishing characteristics: Readily distinguished in flower by the yellow base of each petal. In fruit, look for the recurved pedicels (fruit stalks) and sepals tightly appressed to the fruit.
  • Flower characteristics: Flowers in 3 to 12 whorls, the upper staminate, on long, slender pedicels, the middle and lower bisexual on somewhat shorter, stout, recurved pedicels; 9 to 12 stamens in bisexual flowers, 12 or more in staminate flowers; petals 7 to 15 mm and with a dark spot at the base of each.
  • Fruit characteristics: Achenes 2 to 3 mm, narrowly winged on the top and bottom margins only (sides wingless); oblique or horizontal beak often more than half as long as the width of the body.
  • Leaf characteristics: Petioles elongate, round and very spongy; basal lobes large, pointed and divergent in floating forms; deep water forms with only submersed, linear leaves to 0.5 cm wide.


  • Blooming phenology: late July through early August
  • Fruiting phenology: late August through early September
  • Optimum time to identify: The optimal identification period for this species is late August through early September


  • Growth form: Aquatic forb-emergent
  • Vegetative reproduction:
  • Life cycle: Annual/perennial
  • Comments: Associated Species: Not recorded for Wisconsin specimens.

State status

Status and Natural Heritage Inventory documented occurrences in Wisconsin

The table below provides information about the protected status - state and federal - and the rank (S and G Ranks) for Long-lobed Arrowhead (Sagittaria montevidensis ssp. calycina). See the Working List Key for more information about abbreviations. Counties shaded blue have documented occurrences for this species in the Wisconsin Natural Heritage Inventory database. The map is provided as a general reference of where this species has been found to date and is not meant as a range map.

Documented locations of Sagittaria montevidensis ssp. calycina in the Natural Heritage Inventory Database as of July 2015.

Summary Information
State StatusSC
Federal Status in Wisconsinnone
State RankS1
Global RankG5T5?
Tracked by NHIY

Habitats and landscapes

The Natural Heritage Inventory has developed scores indicating the degree to which each of Wisconsin's rare plant species is associated with a particular natural community or ecological landscape. This information is similar to that found in the Wildlife Action Plan for animals. As this is a work in progress, we welcome your suggestions and feedback.

General habitat information

  • Habitat description: Found on the muddy shores of sloughs and in the backwaters of the lower Mississippi and Wisconsin Rivers.
  • Soils: Wet, neutral to calcareous soils.

Natural communities

This table lists the natural communities that are associated with Long-lobed Arrowhead. Scores for natural community associations are: "significant" association (score=3), "moderate association" (score=2) or the species can be present but is only weakly associated with the community (score=1).

Natural communities score
Warmwater rivers 3
Floodplain Forest 2
Emergent Marsh 3

Ecological landscapes

This table lists the ecological landscape association scores for Long-lobed Arrowhead. The scores (3=High, 2=Moderate, 1=Low, 0=None) also correspond to the map.

Map of the Ecological Landscapes of Wisconsin.

Ecological landscape score
Western Coulee and Ridges 3

Species guidance

The Endangered Resources Program has developed avoidance measures and management guidelines for plants on the Natural Heritage Working List. These are a work in progress, and we welcome your suggestions and feedback. Sources used in developing this information can be found here.

Avoidance measures

These are specific actions designed to avoid "take" (mortality) of this species.

  • No avoidance measures have been developed for this species.

Management guidance

Management guidelines are additional considerations that may help maintain or enhance habitat for this species

  • No guidance has been developed for this species.


Long-lobed Arrowhead Photo.

Scanned specimen courtesy of Wisconsin Herbarium

Long-lobed Arrowhead Photo.

Scanned specimen courtesy of Wisconsin Herbarium

Long-lobed Arrowhead Photo.

Scanned specimen courtesy of Wisconsin Herbarium

Support for Wisconsin's rare plant information has been provided by the Division of Forestry, the Endangered Resources Fund and the Wisconsin Rare Plant Preservation Fund. To donate, visit the Natural Resources Foundation of Wisconsin [exit DNR].

Last revised: Wednesday, October 14, 2020
Southwest Savanna Southern Lake Michigan Coastal Western Coulees and Ridges Southeast Glacial Plains Central Sand Hills Central Lake Michigan Coastal Central Sand Plains Northern Lake Michigan Coastal Northern Lake Michigan Coastal Northeast Sands Western Prairie North Central Forest Northern Highlands Northwest Lowlands Northwest Sands Northwest Lowlands Superior Coastal Plains Forest Transition