it mighht be usefull to add lenght of time for items that cause an effect.
And I think you are taking things a bit too seriously.
This guide here is more than enough for new players.
Complete Guide to Consumables
If someone would be willing to compile these in to a more organized format for the wiki and/or website, we'd be able to post them there for ease of viewing/searching.
the elixer vendor near elemental canyon also does invisibility.
Sorry I haven't had the time to update this - might get to it this afternoon/evening.
book riddles
Level 21 spells of: 'identify' 'know alignment' 'faerie fog'.
Piramid
free and summable
It's all in wiki.
Oh that goes on my bookmarks 
PS. It misses bone armor.
And, of course, the (raw) data is here:
http://forsakenlands.wikispaces.com/consumables_data/
From there you can take a look how you might want to form any data that could/should be added in.
We agreed with Volgathras that any unlimited-use items, that aint "consumed" in use, really doesn't belong to this list, as they're not really "consumables". For comparison, you eat pills, quaff potions, wands/staves have limited charges, etc. As an example for non-consumable, a marmalade orb (a weapon), stays on your hands no matter how much you discharge it.
That is not decision, but for the sake of the simplicity of the list, it would be good if it would become into conclusive decision.
That potion of ...recall is in the Cavern of Shudde M'ell. Assuming it's still there. I haven't gotten high enough yet to venture there. The Willow branch is north of Rheydin towards that Asylum assuming that's there still too. I believe the Stoneberry leaves are in that Ford or whatever just south into the Dragons Teeth on your way to Desolation. And the Ancient Illustrated Parchment I believe is in that Undead Keep below where Emerald used to be. Ohrylok or something like that carries it and he hurts bad with a lot of the classes I played. But I played mostly mages.
http://forsakenlands.wikispaces.com/consumables
Locations for these items are known:
a green potion of .. recall - Ruins of Anduin
some Stoneberry leaves - the Ford
an ancient illustrated parchment - In The Clouds (unless you mean something else)
a willow branch lacks area information, thus it would be useful if you could provide exact knowledge about that. Either reply here, PM me, or edit it into here:
http://forsakenlands.wikispaces.com/consumables_data/
It would also be useful if the staff would add the link to the wiki-list into the first post.
A willow branch is in Barren Highlands and is held by the Weeping Willow.
Added. Thanks Jibber.
When the hell did we get a Wiki? I'm so used to the hoarding of all this stuff. :-P
Actually there is a scroll that's something similar to that but it's all level 50 spells and it's in that Undead Keep assuming it's still there. I used it as Egui a whole ton along with the second one and they're both rare. It came in very handy for Cabal defense when I was in Savant. In fact I think I may have used it on Layabout about 8 times in the span of a few days.
My bad.
Object 'scroll critical vaporizing' is type scroll, material paper.
Weight is 1, value is 10, level is 40.
Level 50 spells of: 'plague' 'blindness' 'weaken' 'poison'.
Rare item.
Object 'halon cigar' is type wand, material tobacco.
Extra flags: glow.
Weight is 0, value is 100, level is 15.
Has 5 charges of level 15 'flamestrike'.
The Butchery place near Falen Dara has this nifty little thing.
Object 'potion mystical restoration' is type potion, material liquid.
Extra flags: hum.
Weight is 0, value is 2505, level is 40.
Level 45 spells of: 'word of recall' 'flesh armor' 'cause serious'.
Object 'glowing blue pill' is type pill, material unknown.
Extra flags: none.
Weight is 0, value is 3180, level is 40.
Level 50 spells of: 'poison' 'armor' 'dysentery'.
I don't know where these two are, I just found them in my ID file.
Identify
Omnipotence (scroll) - Mirurvhor
Can't be used as a melee, but you can have someone use it one you. One of the best things I ever learnt off a group mate 
L-A
Actually there is a scroll that's something similar to that but it's all level 50 spells and it's in that Undead Keep assuming it's still there. I used it as Egui a whole ton along with the second one and they're both rare. It came in very handy for Cabal defense when I was in Savant. In fact I think I may have used it on Layabout about 8 times in the span of a few days.
scowl
Healer's with acid blast 
:p
L-A
It's been a while since I've logged into FL, but I thought I'd add a couple while expanding on others. I hope I'm not out of date. Not to mention that it's been a while since a post was put down. These aren't in the OP or Wiki.
Keep of Myran Dammel-
Transient Decapitation also has Phantom Grasp in addition to acid blast.
Scroll of Critical Vaporize: Plague, Blindness, Weaken, Poison
Mirhuvor-
Sparkling pill: Sanctuary
High Tower-
Blackened Wand (just "wand" as a short description): Fireball
Herbal Brew: poison
OP has the Wand of Fire listed as "fireball" when it's "flamestrike". Wiki is correct, though.