New York Natural Heritage Program
Spongy Arrowhead
Sagittaria montevidensis ssp. spongiosa (Engelm.) Bogin
Monocots
Sagittaria montevidensis var. spongiosa Troy Weldy
Family: Water-Plantain Family (Alismataceae)

State Protection: Threatened
listed species are those with: 1) 6 to fewer than 20 extant sites, or 2) 1,000 to fewer than 3,000 individuals, or 3) restricted to not less than 4 or more than 7 U.S.G.S. 7 minute topographical maps, or 4) listed as threatened by U.S. Department of Interior.

Federal Protection: Not Listed

State Rarity Rank: S2
A State Rarity Rank of S2 means: This plant is threatened/imperiled in New York because of rarity (typically 6-20 populations or few remaining individuals) or is vulnerable to extirpation from New York due to biological factors.

Global Rarity Rank: G5T4
A Global Rarity Rank of G5T4 means: Apparently Secure globally - The subspecies/variety is uncommon in the world but not rare; usually widespread, but may be rare in some parts of its range; possibly some cause for long-term concern due to declines or other factors. (The species as a whole is common globally.)


Did you know?
Of the nine arrowhead species that occur in New York, only spongy arrowhead is an annual (Haynes and Hellquist 2000, Weldy and Werier 2005). The name spongiosa means spongy (Fernald 1970) and is clearly in reference to the very spongy leaves.

State Ranking Justification [-]
There are about 20 known extant populations, 2 populations which have not been seen in over 70 years, and 1 population which is believed extirpated. Of the about 20 extant populations, 7 of them have 100 or fewer individuals. Overall, the habitat for this species is very limited in New York and some of it has been altered or destroyed.

Short-term Trends [-]

Long-term Trends [-]