Pontederiaceae

Pontederia cordata L. (Cultivated) (Alabama; Argentina Northeast; Argentina Northwest; Arkansas; Belize; Bolivia; Brazil North; Brazil Northeast; Brazil South; Brazil Southeast; Brazil West-Central; Colombia; Connecticut; Cuba; Czechoslovakia; Delaware; District of Columbia; Florida; Georgia; Honduras; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Maine; Maryland; Masachusettes; Mexico Gulf; Mexico Southwest; Michigan; Minnesota; Mississippi; Missouri; Nebraska; New Brunswick; New Hampshire; New Jersey; New South Wales; New York; North Carolina; Nova Scotia; Ohio; Oklahoma; Ontario; Paraguay; Pennsylvania; Prince Edward I.; Qubec; Rhode I.; South Carolina; South Dakota; Tennessee; Texas; Uruguay; Venezuela; Vermont; Victoria; West Virginia; Wisconsin as per Catalogue of Life)

(Alabama; Andaman Is.; Argentina Northeast; Argentina Northwest; Arizona; Aruba; Assam; Azores; Bahamas; Bangladesh; Belize; Benin; Bermuda; Bolivia; Borneo; Brazil North; Brazil Northeast; Brazil South; Brazil Southeast; Brazil West-Central; Burkina; California; Cambodia; Cape Provinces; Cayman Is.; Central African Repu; Chile Central; China North-Central; China South-Central; China Southeast; Colombia; Congo; Cook Is.; Costa Rica; Cuba; Czechoslovakia; Dominican Republic; East Himalaya; Ecuador; Egypt; El Salvador; Fiji; Florida; Free State; French Guiana; Gambia; Georgia; Guatemala; Guyana; Hainan; Haiti; Hawaii; Honduras; Illinois; India; Italy; Jamaica; Japan; Jawa; Kenya; Korea; KwaZulu-Natal; Leeward Is.; Louisiana; Madagascar; Malawi; Malaya; Mauritius; Mexico Central; Mexico Gulf; Mexico Northeast; Mexico Northwest; Mexico Southeast; Mexico Southwest; Mississippi; Mozambique; Nauru; Nepal; Netherlands Antilles; New Caledonia; New South Wales; Nicaragua; Norfolk Is.; North Carolina; Northern Provinces; Northern Territory; Panam; Paraguay; Peru; Philippines; Portugal; Puerto Rico; Queensland; Rodrigues; Runion; Society Is.; South Australia; South Carolina; Spain; Sri Lanka; Sudan; Sumatera; Suriname; Taiwan; Tanzania; Texas; Thailand; Trinidad-Tobago; Uruguay; Venezuela; Victoria; Vietnam; Virginia; Western Australia; Windward Is.; Zambia; Zare; Zimbabwe as per Catalogue of Life)

Pontederia vaginalis Burm.f. (Native to: Afghanistan, Andaman Is., Assam, Bangladesh, Borneo, Cambodia, China North-Central, China South-Central, China Southeast, East Himalaya, Hainan, India, Japan, Jawa, Korea, Laos, Lesser Sunda Is., Malaya, Maluku, Myanmar, Nansei-shoto, Nepal, New Guinea, Northern Territory, Pakistan, Philippines, Primorye, Queensland, Sulawesi, Sumatera, Thailand, Vietnam, Western Australia; Introduced into: California, Fiji, Hawaii as per POWO)
(Keys as per Flora of China and FoC illustration;
As per efi thread: The leaves are 15-20 cm long, hastate; the flowers are on long pedicels. In M. vaginalis the leaves are 10 cm, ovate-cordate and flowers are sub-spicate. Besides flowers, perianth segments of withered flowers are seen twisted around the fruit in a cork screw manner. This is another character of M. hastata compared to M. vaginalis)