Kanji for Orchid

Hi folks,

right! I'm hunting for the correct Unicode codes for the Mah Jong-related
kanji, and I'm a little muddled with 'orchid' and would kindly appreciate
some clarification.

According to the document of Mah Jong characters in Unicode font that Tom
Sloper kindly e-mailed me a good while ago the character for the Orchid
'season/flower' is U+6B04.  This can be seen at
http://www.unicode.org/cgi-bin/GetUnihanData.pl?codepoint=6B04.  This page
says it has the Mandarin 'LAN2', and the definition "railing, balustrade;
animal pan".  But this doesn't seem to tally with the character on the
orchid tile shown in either Millington's or Lo's books.  The other
characters for Plums, Chrysanthemum and Bamboo all match up, as do the
seasons, spring, summer, autumn (fall) and winter.

I've also discovered that U+5170
(http://www.unicode.org/cgi-bin/GetUnihanData.pl?codepoint=5170) is Mandarin
'LAN2' and is given the definition "orchid; elegant, graceful".  But neither
does this match with the Millington tile image.

Looking up the Chinese Glossary at the back of Millington reads: 6721 lan2
(C.H. lan; H. lau; F. loa, lau; N. laan; J.ran) 'a general term for
orchidaceous plants - "orchid"'.

Any guidance (so long as it's correct!) and clarification would be
gratefully accepted.  Thanks.

Gareth J M Saunders
Edinburgh, UK