Could someone possibly confirm whether the following are correct or not:

1.Sagittaria latifolia, Sagittaria sagittifolia (broadleaf arrowhead, duck potato)

a. นางกวัก NANG KWAK

b. ผักคางไก่ PHAK KHANG KAI

c. เต่าเกียด TAO KIAT

2.Sagittaria trifolia var. edulis (three-leaf arrowhead)

ขาเขียด KHA KHIAT

Thank you for your help.

For arrowhead, one academic site gives

ผักคางไก่ นางกวัก เต่าเกียด, i.e, PHAK KHANG KAI, NANG KWAK and TAO KIAT. I.e. exactly what you have. NANG KWAK is a surprise since it's the name of a female spirit, often seen outside Thai shops beckoning customers in (though these days the Japanese cat seems more common in this role).

See http://www.ku.ac.th/fish/mfish.html/aqplant/aqpt021.html

I am NOT finding Sagittaria trifolia as ขาเขียด in any academic sources - only dubious dictionary entries. Wikipedia gives ขาเขียด as Monochoria vaginalis (see http://th.wikipedia.org/wiki/%E0%B8%82%E0%B8%B2%E0%B9%80%E0%B8%82%E0%B8%B5%E0%B8%A2%E0%B8%94 ) as does http://agedu.kmitl.ac.th/agedu/upload_textbook/1615052556-12-04_pest%20contol%20technology.pdf . Monochoria vaginalis is a kind of water hyacinth - a highly invasive weed species that blocks waterways.

Edit: fixed link

Edited October 14, 201411 yr by AyG

Dear AyG,

Thank you so much for your help on this.

The story on NANG KWAK is interesting. Seems a little spooky, being beckoned into a shop by a female spirit. I guess I would need to know the whole story to understand it.

Previously KHA KHIAT came up with 2 versions of Sagittaria:

Sagittaria sagittifolia var. leucopetala

Sagittaria trifolia var. edulis

I don't remember where I found them, but Monochoria vaginalis is completely different from the three-leaf arrowhead (as you say), so perhaps KHA KHIAT was an error.

Thanks for your help again. I'm glad we could at least confirm 3 names.

Dear AyG,

I remember where I found KHA KHIAT. It was in the MULTILINGUAL MULTISCRIPT PLANT NAME DATABASE(MMPND).

Best regards,

OK making progress on this.

Wikipedia says that วงศ์ขาเขียด (the KHA KHIAT family) refers to about 20 species in the genus Alismataceae including Sagittaria species.

http://th.wikipedia.org/wiki/วงศ์ขาเขียด

The English version of the same page appears to be a direct translation http://en.wikipedia.org/wiki/Alismataceae

This page states that it's used for Sagittaria lancifolia L.

http://www.plantphufa.aerdi.ku.ac.th/detail.php?id=34

Various other pages give it as the name for other species in the same genus.

So yes, KHA KHIAT can refer to Sagittaria trifolia var. edulis, but it's not prescriptive, and refers to a whole bunch of related plants too.

Edit: fixed link

Edited October 15, 201411 yr by AyG

Dear AyG,

Thank you! Glad to hear that KHA KHIAT can refer to Sagittaria trifolia var. edulis.

That's exactly what I needed to know, because it directly relates to what is known as KUWAI, which is a kind of water chestnut, often used in Chinese dishes.

The other Saggitaria which I referred to previously is another type of this.

I really appreciate all the time you have spent on this.