PRONUNCIATION:(pro-KUM-buhnt)
MEANING:adjective:
1. Lying face down; prone; prostrate.
2. Of a plant: Growing along the ground without putting new roots.

Must criticize the definition's information "without putting new roots"

One of my favorite procumbents "sweet woodruff" is definitely spreading through rooting stems. Furthermore it's been called 'a nuisance plant' by the City of Portland. mad

Sweet woodruff is an old kitchen garden herb, lovely to add to salads or added to white wine it gives 'May wine' a lovely flavour.(it flowers in May)
Dried it used to be added to pillows for a restful sleep.
(common name in Dutch is Lievevrouwenbedstro-Sweetladiesbedstraw)

I must protest against the City of Portland. mad
* as the rooting system is very light it can easily be controlled.

Name: Sweet woodruff; Galium odoratum
Invasive Status: Invasive in Oregon, other Pacific Northwest states. Listed by the City of Portland as a nuisance plant.
Description: Perennial, procumbent herb, grows to 12 inches. Whorled leaves are fine-textured and deep green. Clustered flowers are white and produce small fruits.
Invasive Characteristics: Spreads through rooting stems. Noted to be invasive under conditions where moisture is adequate during the summer.

Photo Credit: Oregon State University