Leaf vein nomenclature

From: a san juan kalim1998 at yahoo.com> on 2005.06.25 at 04:22:18(13047) I was looking at a key for Philodendrons, and came upon a numbering system for leaf veins that I'm not sure about. +More "primary lateral veins of anterior division (5-)6-9(-10) per side" What does this mean? Thanks for any help! __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ Aroid-l mailing list Aroid-l@gizmoworks.com http://www.gizmoworks.com/mailman/listinfo/aroid-l

From: "Derek Burch" derek at horticulturist.com> on 2005.06.25 at 11:57:31(13050) 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. +More Hope this helps, Derek -----Original Message----- 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! __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ Aroid-l mailing list Aroid-l@gizmoworks.com http://www.gizmoworks.com/mailman/listinfo/aroid-l _______________________________________________ Aroid-l mailing list Aroid-l@gizmoworks.com http://www.gizmoworks.com/mailman/listinfo/aroid-l

From: Aroideae at aol.com on 2005.06.25 at 12:11:17(13051) it means that there are normally 6 or as many as 9 primary lateral veins on either side of the midrib of the anterior lobe, which is that portion from the point of petiole attachment to the apex of the leaf blade. the numbers in parenthesis mean that there are rarely as few as 5 primary lateral veins per side or as many as 10, usually meaning that only one specimen had 5 and one specimen had 10. +More I was looking at a key for Philodendrons, and cameupon a numbering system for leaf veins that I'm notsure about."primary lateral veins of anterior division(5-)6-9(-10) per side"What does this mean?Thanks for any help! _______________________________________________ Aroid-l mailing list Aroid-l@gizmoworks.com http://www.gizmoworks.com/mailman/listinfo/aroid-l

From: a san juan kalim1998 at yahoo.com> on 2005.06.26 at 06:15:27(13056) Ahhh!!!! Thanks to the people who answered...now that it's explained, it seems so self-evident! --- Derek Burch wrote: +More > 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! > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam > protection around > http://mail.yahoo.com > _______________________________________________ > Aroid-l mailing list > Aroid-l@gizmoworks.com > http://www.gizmoworks.com/mailman/listinfo/aroid-l > > > _______________________________________________ > Aroid-l mailing list > Aroid-l@gizmoworks.com > http://www.gizmoworks.com/mailman/listinfo/aroid-l > ____________________________________________________ Yahoo! Sports Rekindle the Rivalries. Sign up for Fantasy Football http://football.fantasysports.yahoo.com _______________________________________________ Aroid-l mailing list Aroid-l@gizmoworks.com http://www.gizmoworks.com/mailman/listinfo/aroid-l

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