what's up with Crinums?

Does anyone know the difference- if there is one- among these plants?

Crinum asiaticum
Crinum americanum
Crinum angustum
CCrinum jagus?

I've searched all the normal places and don't see the first and last one even listed in PLANTS,or ITIS, or anywhere else that is authoritative. I'm just looking for a brief discussion on the differences ? I suspect mis-naming.

Crinum jagus doesn't look anything like the other three .. I google pictured them all and the first three do look considerably alike.

Try this link

http://www.pacificbulbsociety.org/pbswiki/index.php/CrinumSpeciesOne

Crinum amoenum is native to India, where it grows along rivers. The flowers look much like C. americanum and allies, but it does not spread by rhizomes. The flowers tend to open all at once, so an individual scape is glorious but short lived.

This message was edited Aug 27, 2010 8:12 AM

Crinum americanum

http://plants.usda.gov/java/profile?symbol=CRAM2

http://www.wildflower.org/plants/result.php?id_plant=cram2

http://plants.jstor.org/specimen/mo-202119

Crinum asiaticum

http://plants.usda.gov/java/profile?symbol=CRAS6

http://plants.jstor.org/visual/pdig00001394

http://www.eol.org/pages/1087153

http://www.naturia.per.sg/buloh/plants/crinum_lily.htm

Crinum augustum

http://plants.jstor.org/visual/kcur00001276

http://cookislands.bishopmuseum.org/species.asp?id=5989

http://en.wikipedia.org/wiki/Crinum

Crinum jagus

http://www.ars-grin.gov/cgi-bin/npgs/html/taxon.pl?410552#link

http://plants.jstor.org/specimen/fhi0017173-0

http://www.desert-tropicals.com/Plants/Amaryllidaceae/Crinum_jagus.html