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RE: [Aroid-l] Leaf vein nomenclature

  • Subject: RE: [Aroid-l] Leaf vein nomenclature
  • From: "Derek Burch" derek@horticulturist.com
  • Date: Sat, 25 Jun 2005 07:57:31 -0400
  • Importance: Normal

This looks much more complicated than it really is. Using your example, it
means that the usual number of veins per side is six to nine. But in
examining a lot of specimens that in all other characters fit the species
description, the botanist found occasional examples with as few as five or
as many as ten veins per side. 
Particularly when used in a key, this prevents a plant being excluded from
its correct identification because it is aberrant in a single small
character. As I am sure you know, you should always read both parts of the
couplet that makes up that stage in the keying process, and select the path
that best fits the "unknown" plant even if it isn't an absolutely perfect
fit.
Hope this helps, Derek 

-----Original Message-----
From: aroid-l-bounces@gizmoworks.com [mailto:aroid-l-bounces@gizmoworks.com]
On Behalf Of a san juan
Sent: Saturday, June 25, 2005 12:22 AM
To: Discussion of aroids
Subject: [Aroid-l] Leaf vein nomenclature

I was looking at a key for Philodendrons, and came
upon a numbering system for leaf veins that I'm not
sure about.

"primary lateral veins of anterior division
(5-)6-9(-10) per side"

What does this mean?

Thanks for any help!

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