So, this means you can stop eating kale, right?

Sorry kale haters, but 49.07 is still a highly respectable Nutrient Density Score.  Your biggest takeaway here is that kale is not your one stop shop for daily nutrients.  In fact, the healthiest (and most enjoyable) diets are those with a lot of variety.  So mix your kale with some other tasty greens, to ensure a healthy and happy diet!

 A Cautionary Kale:  Although it's in 15th place, kale is still action packed with nutrients, including a whopping 1180 times the recommended daily intake of Vitamin K.  People on blood thinners should consult their health care providers about what not to eat because greens like kale and spinach might be doing more harm than good!

As far as green, leafy vegetables go, endives don't seem very green or leafy. That doesn't stop them from being packed full of nutrients, despite containing hardly any calories.  The endive the CDC is referring to here is the Belgian endive pictured on the right.

Endives are a great source of folate, vitamin K, choline, minerals, omega-3 and omega-6 fatty acids, as well as additional vitamins though they're found in much smaller amounts.

Mustard Greens have been shown to lower cholesterol, and they fall just short of collard greens and kale in this ability.  Like many green, leafy vegetables, mustard greens contain cancer-fighting agents, and they are second only to Brussels sprouts in glucosinolate, one such compound.

A terrific source of vitamins and minerals, and packing a strong peppery bite, mustard greens are great as a side dish or mixed in with other greens in a salad.

Turnip Greens can be rather bitter, but a major reason for this is the considerable amount of calcium they provide.  In fact, one cup of steamed turnip greens can provide 20% of your daily calcium requirements.  This is especially impressive when you take into consideration that calcium has far and away the highest daily requirement of all the micronutrients.

Calcium is not their only benefit, though.  Turnip greens still come packed with other minerals, vitamins, protein and omega-3 fatty acids.

Everybody knows that romaine lettuce is far healthier than the relatively useless iceberg lettuce.  Or at least they do after reading that last sentence.  Romaine lettuce is a staple in most salads, so it's nice to see that this mild and fresh tasting lettuce is so nutrient rich.

Use romaine lettuce as a base for your salads, and then add other greens and herbs around it for a variety of exciting flavors.  Cilantro did not make this list, but it's still a very nutritious herb that pairs well with a little romaine.  Add in some leaf lettuce and one of the more "peppery" vegetables, such as mustard greens and you're off to a tasty and healthy start.  You don't need to rely on your vinaigrette to enhance the flavor of your salad!  Variety is the spice of life, after all.

One of the tastiest plants to make this list, parsley is the most popular herb in the world.  It's great as a seasoning or added to salads, but parsley can also be used in uncommon ways, such as adding it to a sandwich in place of lettuce.

Not just flavorful, parsley is noted for being rich in vitamin C, antioxidants and carcinogen neutralizing agents.  It has been also been associated with good heart health.

Leaf lettuce is second only to Popeye's favorite in nutrient density among the most common green, leafy vegetables.  While spinach dominates in nearly every category, an NDS of 70.73 is nothing to sneeze at.  That's more than twice the NDS of broccoli.

Maybe parents should be telling their children to eat their lettuce, instead?

The chicory family includes radicchio, escarole and cultivated dandelion (which has a more subtle flavor than the wild dandelion weeds).  The taste of each is similar, despite their differences in appearance, and each one is packed full of nutrients.

Beyond the usual vitamins and minerals, chicory is an excellent source of potassium, a valuable electrolyte.

It's no surprise to find spinach in the top five vegetable powerhouses.  A great source of calcium and vitamin K, spinach outstrips most green, leafy vegetables in nearly every nutrient category.

Long known for its versatility on the breakfast, lunch or dinner table, spinach is just as versatile as a nutrient delivery system.  Its well-rounded repertoire makes it a valuable addition to any meal.

With the obvious exception of Soylent, most foods that end with the word "green" tend to be quite healthy, but none more so than beet greens.  The vibrant green colors of the leaves and deep reddish-purple of the stems and veins are our visual clues that these wonderful vegetables are packed with a variety of nutrients.

With a high concentration of iron, and more protein than most greens, beet greens contain sizable percentages of many of our daily requirements.  While their folate levels aren't overly impressive at 5% of the RDI, including one cup of beetroot with a serving of the greens can boost those levels to nearly 40% of the RDI.  Adding beetroots will also provide additional fiber, minerals, vitamin C and vitamin B6.

One of the prettier vegetables on the market, chard contains all of the carcinogen binding chemicals, bioflavonoids and phytonutrients we've come to expect out of our green, leafy vegetables, but with the addition of syringic acid.  Syringic acid is a nutrient that's been found to help regulate blood sugar levels.

Combine these amazing abilities with a nutrient density score of a whopping 89.27, and you've got yourself a vegetable that's not just pretty to look at, it's pretty darn good for you to eat it as well.

Like regular cabbage, only taller.  Oh, and also packed with an incredible amount of nutrients.  Chinese cabbage, or bok choy, contains very good amounts of 21 different nutrients.  This includes omega-3 fatty acids and even high concentrations of zinc.

Chinese cabbage is a great addition to any diet, but it's especially useful if you're looking for dietary sources of anti-oxidants and anti-inflammatories.

And the Winner Is!

Watercress tops off the list at #1 with the unmatched nutrient density score of 100.  You don't hear a lot of talk about watercress outside of the nutritionally well informed, but it's long been known as a superfood.  Despite being very low in calories, it contains a wide variety of nutrients, without going overboard on the vitamin K as many green, leafy vegetables do.  In fact, watercress doesn't go all out in any single ingredient.  Where it shines is in its  jack-of-all-trades nature.