The Lemon - 1 (The Lemon Fruit by Bartholomew & Sinclair)
Although the Lemon is not edible in the same manner as most other citrus fruits and other deciduous fruits, the Lemon probably has a greater variety of culinary, beverage, industrial, and medicinal uses than ANY OTHER fruit. - Millet

We have several times more uses of Calamondin fruits than lemon fruits. But Calamondin fruits, whose plant is a lot cold hardier, have more culinary, medicinal, beverage, and nutritional uses than lemons, but only to some ethnic minorities and is practically an unknown fruit to most people.

Joe, you could possibly be correct about the Calamondin if it was was commercially grown and generally used. However, almost no one in the general public has ever use a Calamondin, nor even ever heard of it. The lemon is generally thought to be among the most used of any fruit. - Millet

The Lemon - 2
The Eureka variety gained predominance early on because of its superior quality and productiveness in most areas, and because it matures a considerable quantity of its fruit during late spring and in the summer when demand and prices are at a maximum. - Millet

Agree with you there about the Eureka. Practically, one of the best features of Eureka is the lack of prominent thorns on the stems, unlike Lisbons which have thorns on almost every node.

Skeet, yes, that is correct that Lisbon's thorns are small at the fruiting branches, but not at their juvenile branches. The small thorns on the fruiting stems seem to be "invisible" to my poor eyes, and they get me all the time during grafting or harvesting fruits.

The Calamondin may become popular in my area. For the last two years they are showing up at the Lowe’s and Home Depots here. Someone is buying them because they go as quickly as other citrus. I did not buy one because one lemon tree will produce more fruit than we consume.

No matter how many Calamondin trees we've got, there is never enough fruits for all of our friends who come and pick them up, especially during allergy season. The only time we have an abundance is around October to December. That is the time when I have more than enough to make Calamondin wine.

Calamondin grafted on top of grapefruit or pummelo works very well. All the calamondins topworked unto my professor's tree are pushing out, so I'd have helped in the supply of Calamondin fruits.

While my first dialect calls it Calamondin, my second dialect calls it Kalamansi. Now OSH and Home Depot are starting to insert the name Kalamansi in their labels. The Kalamansi name is more popular in the Philippines, because it is the name of the tree in the national language, Pilipino, rather than the Calamondin name which is only known in some local dialects. We have more than 100 local dialects in the Philippines, and I can understand just about 4 of them, and am familiar with 8 others.

And about lemons, we have that year round and never run out of fruits, and more than enough for our cooking needs, but never got enough to make wine out of my lemons. I only have one tree dedicated to lemons. I do have many other lemons grafted to two other trees.

Joe
Is the clamondin a kumquat hybrid?

Yes, Laaz is correct.

Calamondin is a hybrid between Citrus reticulata (unknown Mandarin cultivar, could be also be wild) and Fortunella margarita (Kumquat).

The Lemon - 3
Lemons should be harvested by being cut from the branch with a clipper. The cut should be made at the distal end of the stem (closest to the branch) so that the calyx, receptacle and disc remain attached to the base of the fruit. Collectively these three organs constitute what, in commercial terms, is called the" button" of the fruit. A Lemon with the button attached will survive in storage longer than one from which the button has been removed. - Millet

Millet, that is how calamondins are harvested. You have to cut part of the petiole, or including the button. If you snap them off, sometimes the calamondin skin remains and becomes moldy, which will infect future blooms. If you just snap off the lemons, the button remains on the tree, some black molds develop on them too. I always use clipper. But with Calamondins that have too many fruits to harvest, a special thumb worn cutter is the best to use. I have illustrated on how to build such device in one of the tutorials here.