Landoltia punctata (G. Mey.) Les & D.J. Crawford

Landoltia punctata (G. Mey.) Les & D.J. Crawford View in CoL [ Araceae ]

Landoltia punctata is reported as new to Indiana based on collections made in Posey County in 2020 by Scott Namestnik, Roger Hedge and Ryan Keller and in 2021 by Scott Namestnik , and in Warrick County in 2022 by Scott Namestnik and Wyatt Williams. In all situations it was growing in swamps and sloughs in standing water. No systematic effort was made to quantify abundance, but it is expected that it is widespread and abundant at these locations. Although these two sites are the only known locations for L. punctata in Indiana to date, it is likely that it is more common in the southern part of the state than is currently documented by collections.

This free-floating aquatic duckmeat with fronds>1.5 times as long as wide and usually with 2–7 roots per frond and 5–7 nerves per frond is considered by most to be native to the southern hemisphere and introduced in the northern hemisphere ( Kartesz 2015; Landolt 2000 [as Spirodela punctata ]; Weakley & Southeastern Flora Team 2022a), but Illinois and Kentucky apparently consider it native ( NatureServe 2023). In the United

States L. punctata View in CoL is known to occur from Oregon and California east across the country, extending on the east coast from Massachusetts to Florida , with most occurrences close to the Pacific Ocean , Atlantic Ocean and Gulf of Mexico ( Kartesz 2015). Globally it is secure ( G5 ) , and based on being considered native in Illinois and Kentucky it has a national conservation status rank in the United States of apparently secure ( N4 N5 ) ( NatureServe 2023) . In Indiana Landoltia punctata View in CoL is being treated as an introduction, presumed to have been introduced through the aquarium trade, and thus it does not have a conservation status rank (SNA).

Voucher Specimens: INDIANA. Posey Co.: Twin Swamps Nature Preserve, along east margin of Quercus lyrata View in CoL slough,associated species: Azolla caroliniana View in CoL , Spirodela polyrhiza View in CoL , 37.8252, –87.9902, 10 Sep 2020, S. Namestnik, R. Hedge & R. Keller SN (IND).Twin Swamps Nature Preserve, on edge of swamp in shallow water, in shade, associated species: Acer rubrum View in CoL , Azolla caroliniana View in CoL , Bidens discoidea View in CoL , Carya sp. , Fraxinus lanceolata View in CoL , Liquidambar styraciflua View in CoL , Quercus lyrata View in CoL , Quercus palustris View in CoL , Spirodela polyrhiza View in CoL , Ulmus americana View in CoL , Wolffia brasiliensis View in CoL , 37.82263, –87.99186, 19 May 2021, S. Namestnik 4883 (IND). Warrick Co.: Little Pigeon Creek Wetland Conservation Area,in slough of Little Pigeon Creek, associated species: Acer saccharinum View in CoL , Campsis radicans View in CoL , Cephalanthus occidentalis View in CoL , Lemna sp. , Ludwigia palustris View in CoL , Ludwigia peploides View in CoL , Persicaria punctata View in CoL , Platanus occidentalis View in CoL , Spirodela polyrhiza View in CoL , 38.049435, –87.098579, 11 Aug 2022, S. Namestnik & W. Williams 5537 (IND).