Thymus serpyllum.commons.wikimedia.org (Accessed 4/2014).

Thymus serpyllum is a perennial her; stems creeping, hairy, woody at base, rooting at nodes, branching, forming mats; inflorescence stems erect to 10 cm long. 

Leaves opposite, usually elliptic, to 1 cm long, short-stalked. 

Flowers purple, to 0.6 cm, bilaterally symmetrical, tubular, 2-lipped, upper lip flat, lower lip 3-lobed, slightly longer than upper, calyx 2-lipped, 5-lobed to 0.4 cm, stamens longer than petal lobes, inflorescence spikes at ends of stems to 4 cm, June-Sept.

Fruit dry nutlets.

Wetland status: NL. 

Frequency in NYC: Very infrequent. 

Origin: Europe. 

Habitat: Escaped from cultivation. Upland woods and fields.