Sagittaria engelmanniana J.G. Sm. - Engelmann's Arrowhead


 

|  back  | forward |

Sagittaria engelmanniana - (image 1 of 6)

 

Taxonomy

Family: Alismataceae

Habitat

Acid waters of bogs, ponds, ditches and streams.

Associates

 

Distribution

Mainly along the coast from MA to FL and MS, inland to west central NY.

Morphology

Herbaceous, aquatic perennial; leaves long-petiolate, the blade usually sagittate, the main portion mostly narrow, 4-10 cm long, (1-)2-many times as long as wide, with narrow, linear to lance-attenuate basal lobes; petioles rounded or with 2 blunt ridges on the lower side; scape 20-80 cm, with 2-4 whorls of flowers, the upper staminate, the lower pistillate; pedicels 0.5-3.5 cm, ascending in fruit; bracts herbaceous and relatively thick, 5-25 mm, mostly shorter than the pedicels; sepals 4-7 mm, reflexed in fruit; petals 8-12 mm; stamens 15-25, with slender glabrous filaments as long as or longer than the anthers; mature receptacle echinate; achenes 2.5-4 mm, with 1 or 2(-3) wings on each face, the wings extending onto the obliquely ascending, 1-2 mm long beak; achene faces with resin ducts.

Notes

Flowers August to September

Wetland indicator: OBL

This species is sometimes confused with S. latifolia which can have similarly narrow leaves but has achenes with beaks that spread at right angles to the body.

References

Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.

The New York Botanical Garden. Bronx, NY

 


Home

 

 Michael Hough 2018