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Arisaema Enthusiast Group (AEG) Discussion List (and other= Arisaema Enthusiast Group (AEG) Discussion List (and other=
Thu May 3 21:21:44 CEST 2007

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From: Diane Whitehead <voltaire at ISLANDNET.COM>
Subject: I.D. - key problems
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In previous years I have been able to identify arisaemas using the
keys in the 1st edition of the Gusmans' book.  This year I am not
having success.

Here is one example:

I have one flowering plant in a pot, right beside me as I use the
key. I don't want to damage the spathe, so I don't examine the
flowers, but I do peek inside and see what the spadix looks like.  I
can't identify it.  Then I thumb through the book and find a picture
of A. ovale var sadoense that looks just like it.

I decide to work backwards to see where I used the key incorrectly.

There are several places:
D0:  I chose "5 leaflets at most (1)" since the plant has 5
leaflets.  The correct answer for ovale is "more than 5 (2)"
D3:  I chose "The central leaflet is as long as or longer than the
adjacent pair (0)" instead of "shorter (1)".  The central leaflet is
10 cm long, the adjacent pairs each have one 9 cm and one 10.5 cm
leaflets.  So the central leaflet is longer than one, and shorter
than the other.  I guess that one is a toss-up, but the correct
answer is 'shorter'.
D4:  I think the central leaflet is subsessile, but the correct
answer is petiolulate.

Spathe limb:
F7: I put my finger behind the limb, and could see the outline in the
white stripes, so answered "The limb is partially to totally
translucent (1)" but the correct answer is that it is opaque.

Diane Whitehead

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