Illinois Natural History Survey - University of Illinois

Sagittaria rigida
Stiff arrowhead
Taxonomy

Synonyms:

Subspecific taxa:

Classification:

Other taxonomic & nomenclature sources: USDA Plants;  ITIS;  The Plant List;  IPNI

Species Distribution
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More about map & occurrence records

County Map Legend
Absent:
Not known from county
Medium confidence:
Medium or unknown confidence;
often old records or unverifiable observations
Medium-high confidence:
Often observations by expert botanists
High confidence:
Often vouchered herbarium records
Planted / introduced:
Native species introduced outside historic range,
or only in planted locations within county (e.g., restorations)
Historic / extirpated:
Only historic records for the species; likely extirpated
(Note that this category is not yet functional)

North American distribution maps for this species: FLNA;  USDA Plants;  BONAP;  BISON

Collections, Observations & Flowering by Month [?]

J
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F
0
M
0
A
0
M
0
J
0
J
0
A
0
S
0
O
0
N
0
D
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Collections & Observations by Decade [?]

Species Status

Status/Listing: No Information

Notes:

Origin: Native

Species Description

General: Monocot, perennial

Roots: adventitious, rhizomes, tubers

Shoots: basal leaf arrangment; simple leaf type; entire leaf margin; Parallel leaf venation; oblong, sagittate, hastate leaf shape

Inflorescence: raceme, other

Flowers: unisexual, monoecious, dioecious; 3 merous; complete, regular; white; hypogynous ovary position

Fruit: achene

Physiology: autotrophic; C3 C02 fixation

Reproduction:

Ecology & Natural History

Habitat: Found in almost any kind of bottomland, prefers water of slow moving streams, sloughs, large ponds, lakes from one to two and a half inches deep-for example, margins of natural upland sink-hole ponds, oxbow ponds, and artificial ponds. Also muddy borders of streams, ditches, and artificial waterways.

ILPIN Notes: For this plant aquatic species refers to aquatic furbearers. Marshbirds and shorebirds will eat food such as seeds. 11 Throughout Illinois. Form-tubers planted at one foot intervals. The plant usually monoecious; the upper flowers staminate, lower flowers pistillate.

Functional Relationships:

  • Pollinators:
  • Dispersal:
  • Mycorrhizae:
  • N2 fixation:

Human Relationships:

  • Edibility [?] :
  • Showy Flowers:

Wildlife and Livestock Information:

  • Food Value: waterfowl: good; aquatic species: yes
  • Cover Value:

Coefficient of Conservatism (C-value) [?] :

  • Entire State: 8
  • Chicago Area: 10

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