taxonID	type	description	language	source
03FF87B5D34DFFD4A35756AE92BFFB48.taxon	materials_examined	TYPE: U. S. A. KANSAS. Reno Co.: ¼ mi E, 3 mi S Medora, abundant in small pool in sandhill area, plants in shallow water or stranded, 17 Aug 1977, Brooks 13349 (HOLOTYPE: BRIT [399736]!; ISOTYPES: BRIT [399803]!, KANU!, MO!, NY!).	en	Horn, Charles N. (2020): Two New Species Of Heteranthera (Pontederiaceae) In North America. Journal of the Botanical Research Institute of Texas 14 (1): 1-8, DOI: 10.17348/jbrit.v14.i1.886, URL: https://doi.org/10.17348/jbrit.v14.i1.886
03FF87B5D34DFFD4A35756AE92BFFB48.taxon	diagnosis	Inflorescencia cum 5 – 13 floribus pluribus exsertis supra spathum. Perianthium lavandulum usgue ad purpureum. Perianthi tubus 3 – 5 mm longus, perianthi lobus 3 – 4.5 mm longus; antherae in staminiibus lateralibus 0.5 – 0.8 mm longae, antherae in stamine centrali 1 – 1.3 mm longa.	en	Horn, Charles N. (2020): Two New Species Of Heteranthera (Pontederiaceae) In North America. Journal of the Botanical Research Institute of Texas 14 (1): 1-8, DOI: 10.17348/jbrit.v14.i1.886, URL: https://doi.org/10.17348/jbrit.v14.i1.886
03FF87B5D34DFFD4A35756AE92BFFB48.taxon	description	Leaf blade rounded, apex obtuse, 2.6 – 4.4 cm long, 2.9 – 5.2 cm wide. Spathe 3.6 – 8.5 cm long. Inflorescence 3.7 – 9.5 cm long with 5 – 13 flowers, 0 – 6 of which are within the spathe; floral axis elongating such that most flowers are beyond the spathe apex. Perianth tube 3 – 5 mm long; perianth lobes lavender to purple, 3 – 4.5 mm long; lateral stamens 1 – 1.8 mm long, the anthers 0.5 – 0.8 mm long; central stamen 2 – 3.1 mm long, the anther 1 – 1.3 mm long. Seeds 0.6 – 0.8 mm long, 0.3 – 0.4 mm wide, with 9 – 12 wings. Chromosome number 2 n = 32.	en	Horn, Charles N. (2020): Two New Species Of Heteranthera (Pontederiaceae) In North America. Journal of the Botanical Research Institute of Texas 14 (1): 1-8, DOI: 10.17348/jbrit.v14.i1.886, URL: https://doi.org/10.17348/jbrit.v14.i1.886
03FF87B5D34DFFD4A35756AE92BFFB48.taxon	biology_ecology	Phenology. — Flowering July to November. Inflorescences developing in one or two days. Individual flowers opening about two hours after dawn and wilting in early afternoon.	en	Horn, Charles N. (2020): Two New Species Of Heteranthera (Pontederiaceae) In North America. Journal of the Botanical Research Institute of Texas 14 (1): 1-8, DOI: 10.17348/jbrit.v14.i1.886, URL: https://doi.org/10.17348/jbrit.v14.i1.886
03FF87B5D34DFFD4A35756AE92BFFB48.taxon	distribution	Distribution (Figs. 2, 3). — Roadside ditches, rice fields, and pond edges, 10 – 470 m; USA, Iowa and Nebraska south to Louisiana and Texas. Introductions have been recorded in Alabama, North Carolina and California.	en	Horn, Charles N. (2020): Two New Species Of Heteranthera (Pontederiaceae) In North America. Journal of the Botanical Research Institute of Texas 14 (1): 1-8, DOI: 10.17348/jbrit.v14.i1.886, URL: https://doi.org/10.17348/jbrit.v14.i1.886
03FF87B5D34DFFD4A35756AE92BFFB48.taxon	materials_examined	Representative specimens. U. S. A. ALABAMA. Jackson Co.: wet depression in access road. Barger & Taylor HC # 619 (ALNHS, AUA, UWAL, AMAL). ARKANSAS. Ashley Co.: jct two roads 1.8 mi W of jct US 165, Thomas 97132 (MO, NLU, NY, TENN, UARK). St. Francis Co.: N of Cypress Creek, Denke 1207 (MEM, MSU). CALIFORNIA. Glenn Co.: W of I- 5 rice field of organic grower, J. Lundberg s. n. (DAV). ILLINOIS. St. Clair Co.: lakes, Eggert s. n. (GH, MO, WTU). Union Co.: IL 3, 2.3 mi S jct AL 146, Hill & Koontz 34266 (ILLS, NY, USF). KANSAS. Douglas Co.: 2 mi NE of Lawrence, McGregor 715 (KANU). Harvey Co.: 2 mi N of Burrton on Co. road then 3 mi E on dirt road, Horn 549 (AAU, EA, MO, NY, UNA). Jefferson Co.: 10 mi S of McLouth, Kansas Rockerfeller Tract, Brooks & Seiler 5250 (KANU). Lyon Co.: McKinney Marsh, 1 mi W and 2 mi S of Neosho Rapids, Hauser 3157 (KANU). Pottawatomie Co.: Plum Creek, Gates 17560 (MO). LOUISIANA. Ouachita Par.: Ouachita Wildlife Management Area near Bayou Lafourche, Thomas 101069 (MO, NLU). MISSISSIPPI. Madison Co.: Barnett Reservoir, W of Safe Harbor Marina at Pearl River Waterfowl Refuge, Rogers 8784 (GH, MO, NCU, NY, SMU, USF). MISSOURI. Bates Co.: 1.5 mi W of Papinsville, Steyermark 21282 (F, MO). Boone Co.: Mo. Dairy farm pond, ca. 8 mi W of Columbia on Hwy 40, Christian s. n. (MO). Butler Co.: rice field on N side of US 60 between rt Z and rt 581, Horn 8804 (GH, MEXU, MICH, NASC, NBYC, NY). Christian Co.: 1.5 mi NE of Lindenlure, Palmer 64386 (MO, NLU, UMO). Jackson Co.: Atherton, common in Gaffner’s Lake, Bush 443 (MO, US), Sheffield, Bush 863 (BR, US). Newton Co.: 2 mi SW of Joplin, Palmer 53019 (F, MO, UMO). St. Charles Co.: 5 mi N of St. Peters, Steyermark 8914 (MO, UMO). NORTH CAROLINA. Wake Co.: lake at William B. Umstead State Park, Horn 21352 (NBYC). TENNESSEE. Shelby Co.: Meemen-Shelby Forest State Park, Bates 410 (MEM, MSU). TEXAS. Cameron Co.: Unit 1, Laguna Atascosa National Wildlife Refuge, Fleetwood 7052 (TEX, US).	en	Horn, Charles N. (2020): Two New Species Of Heteranthera (Pontederiaceae) In North America. Journal of the Botanical Research Institute of Texas 14 (1): 1-8, DOI: 10.17348/jbrit.v14.i1.886, URL: https://doi.org/10.17348/jbrit.v14.i1.886
03FF87B5D34DFFD4A35756AE92BFFB48.taxon	discussion	Individual plants have rounded leaves with an obtuse to slightly acute apex, a floral axis commonly almost twice as long as the spathe with 5 – 15 flowers such that most flowers extend beyond the spathe tip. The perianth is a dark purplish color.	en	Horn, Charles N. (2020): Two New Species Of Heteranthera (Pontederiaceae) In North America. Journal of the Botanical Research Institute of Texas 14 (1): 1-8, DOI: 10.17348/jbrit.v14.i1.886, URL: https://doi.org/10.17348/jbrit.v14.i1.886
03FF87B5D34EFFD2A34756FD90E2F9C3.taxon	diagnosis	Inflorescentia cum 3 – 6 floribus pluribus intra spathum. Perianthium pallidum lavandulum. Perianthi tubus 8 – 10 mm longus; perianthi lobus 5.5 – 7.3 mm longus; antherae in stamine laterali 0.6 – 1 mm longae, anthera in stamine centrali 1.3 – 1.9 mm longa.	en	Horn, Charles N. (2020): Two New Species Of Heteranthera (Pontederiaceae) In North America. Journal of the Botanical Research Institute of Texas 14 (1): 1-8, DOI: 10.17348/jbrit.v14.i1.886, URL: https://doi.org/10.17348/jbrit.v14.i1.886
03FF87B5D34EFFD2A34756FD90E2F9C3.taxon	description	Leaf blade rounded, acute to obtuse at apex, 3.5 – 5.2 cm long, 4.2 – 6.5 cm wide. Spathe 3.0 – 5.7 cm long. Inflorescence 2.2 – 4.3 cm long with 3 – 7 flowers, 3 – 5 of which are within the spathe. Perianth tube 8 – 10 mm long; perianth lobes pale lavender to white, 5.5 – 7.3 mm long; lateral stamens 2 – 2.9 mm long, the anthers 0.6 – 1 mm long; central stamen 4.2 – 4.8 mm long, the anther 1.3 – 1.9 mm long. Seeds 0.8 – 1 mm long, 0.4 – 0.5 mm wide, with 9 – 11 wings. Chromosome number unknown.	en	Horn, Charles N. (2020): Two New Species Of Heteranthera (Pontederiaceae) In North America. Journal of the Botanical Research Institute of Texas 14 (1): 1-8, DOI: 10.17348/jbrit.v14.i1.886, URL: https://doi.org/10.17348/jbrit.v14.i1.886
03FF87B5D34EFFD2A34756FD90E2F9C3.taxon	biology_ecology	Phenology. — Flowering July to November. Inflorescences developing in one day. Individual flowers open about three hours after dawn and wilt in early afternoon. Most commonly flowers do not elongate out of the spathe and are thus self-pollinated.	en	Horn, Charles N. (2020): Two New Species Of Heteranthera (Pontederiaceae) In North America. Journal of the Botanical Research Institute of Texas 14 (1): 1-8, DOI: 10.17348/jbrit.v14.i1.886, URL: https://doi.org/10.17348/jbrit.v14.i1.886
03FF87B5D34EFFD2A34756FD90E2F9C3.taxon	distribution	Distribution (Fig. 3). — Freshwater marshes and river margins typically under tidal influence, sea level to 20 m; USA, New Jersey to North Carolina.	en	Horn, Charles N. (2020): Two New Species Of Heteranthera (Pontederiaceae) In North America. Journal of the Botanical Research Institute of Texas 14 (1): 1-8, DOI: 10.17348/jbrit.v14.i1.886, URL: https://doi.org/10.17348/jbrit.v14.i1.886
03FF87B5D34EFFD2A34756FD90E2F9C3.taxon	materials_examined	Representative specimens. U. S. A. DELAWARE. [New Castle Co.]: near Wilmington, Canby 8491 (KANU). MARYLAND. Cecil Co.: White Swan Lake, ca. 2 mi SE of Chesapeake City, Long 41098 (PH). NEW JERSEY. Burlington Co.: South Branch of Pensaulan Creek, 0.25 mi S of Fork Landing, Trudell s. n. (PH). Camden Co.: along Delaware River off of NJ 543 in Pennsauken, Horn 8614 (GH, MEXU, MICH, MO, NASC, NY, UNA). Gloucester Co.: Mathews Brook, West Woodbury, Long 26588 (PH). Salem Co.: 2 mi NW of Pedricktown, Fogg 7915 (GH, PH). NORTH CAROLINA. Bertie Co.: US 17 at Connie Creek, Roanoke River Swamp, Radford 5968 (NCU, SMU). Martin Co.: shallow pool edge of cypress-gum swamp near Welch Creek on US 64 at Washington Co. line, Radford 4586 (NCU, NY). Pasquotank Co.: 4.4 mi S of Weeksville, Ahles 48126 (FLAS, NCU, UC). Perquimans Co.: 1.6 mi NE of Bethal, then 1.2 mi E on dirt road, Ahles 48024 (NCU, SMU). PENNSYLVANIA. Philadelphia Co.: League Island Park, Hass s. n. (PH). VIRGINIA. Gloucester Co.: Beaverdam Lake off rt 606, Horn 12489 (GMUF, NY, UNA, WILLI); Newport News City, 200 ft from Mulberry Island Rd., Fort Eustis, Appler 828 (NCU, WILLI).	en	Horn, Charles N. (2020): Two New Species Of Heteranthera (Pontederiaceae) In North America. Journal of the Botanical Research Institute of Texas 14 (1): 1-8, DOI: 10.17348/jbrit.v14.i1.886, URL: https://doi.org/10.17348/jbrit.v14.i1.886
03FF87B5D34EFFD2A34756FD90E2F9C3.taxon	discussion	These plants have rounded leaves with an obtuse to slightly acute apex and the flowering axis is only about as long as the spathe and the perianth is a pale lavender color. The inflorescence has 3 – 6 flowers and typically only the terminal flower projects beyond the terminus of the spathe, so it may open (Fig. 1 d).	en	Horn, Charles N. (2020): Two New Species Of Heteranthera (Pontederiaceae) In North America. Journal of the Botanical Research Institute of Texas 14 (1): 1-8, DOI: 10.17348/jbrit.v14.i1.886, URL: https://doi.org/10.17348/jbrit.v14.i1.886
