Species Detail Forb

Plant		Yavapai County Native & Naturalized Plants Zannichellia palustris - horned pondweed Synonyms: Zannichellia major Plant Form: Forb or Subshrub Family: Zannichelliaceae
Plant


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Forb Plant Description

Origin: Native Life Cycle: Perennial
General Desc: Aquatic; linear leaves appear to be whorled about the stem; fruits on small stems in leaf whorls; fruits have horn-like appendages on margins.
Identification notes: Submerged aquatic plant of ponds and slow streams; sparsely branched stems; flat, filiform, 1-nerved leaves; male and female flowers in the same leaf axils enclosed by a sheath while in bud.
Height: Length to 40 inches

Habitat

Habitat Description: Brackish or fresh waters of streams, lakes, or estuaries.
Plant Communities: Riparian
Elevation: 1500 - 4600 feet

Flower Characteristics

Color: Greenish Shape: Regular in elongated clusters Tubular: N Flowering Period: May - Sep
Description: Small, lacking sepals and petals; solitary or clustered at the leaf bases. Male and female flowers are separate in the same leaf axils.

Leaf and Stem Characteristics

Leaf Color: Light to medium green Leaf Type: Simple Leaf Shape: Narrow Leaf Margin: Smooth Leaf Attachment: Opposite Leaves Clasp: N
Hairs: Stems Spines: N
Leaf Description: Submersed thread-like leaves, smooth edged; oppositely-arranged (may appear whorled); leaf has a central vein; 1/16 to 4 inches long and less than 1/16 inch wide. Completely submersed weak stems; branched, thin, and thread-like.

Fruit and Seed Characteristics

Fruit Type: Achene
Fruit Notes: Tiny, banana shaped; less than 1/16 inch long with a conspicuous hooked beak measuring less than 1/16 inch long and found in leaf axils.


	Arizona Cooperative Extension Yavapai County 840 Rodeo Dr #C Prescott, AZ 86305 (928) 445-6590	Version 8.0 http://cales.arizona.edu/yavapaiplants/SpeciesDetailForb.php Last Updated: Dec 13, 2022 Content Questions/Comments: Email Matt Halldorson Legal Disclaimer