Dandelion Weeds are the plant equivalent of the Exploding Imp and the Explody Gnome, and as such, they run up to zombies and explode. Their attack is named Dandelion Explode.
In Plants vs. Zombies: Battle for Neighborville the player can play as a controllable Dandelion Weed though the Wildflower ability Weed Out.
The bottom of their stem looks exactly like the other Weed.
Dandelion Weed originally had eyelashes, making them appear more feminine.
Their explosive properties may be a reference to the previous Dandelions, all which have explosive seeds for hair.
There is a Dandelion Weed in the Backyard Battleground that mentions seeing a Peashooter would explode if they saw one, meaning they have a liking for the Peashooter.
If the player switches talks to this Dandelion as a Peashooter, they will get so excited until they explode into a bunch of coins for the player to collect.