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Montana Field Guide

Montana Field Guides

Oregano - Origanum vulgare

Exotic Species (not native to Montana)

Global Rank: GNR
State Rank: SNA

Agency Status
MNPS Threat Rank:
C-value: 1

External Links

General Description
Perennial from creeping rhizomes, 30-70 cm tall. Stems generally simple below the inflorescence except for the axillary fascicles of small leaves; stem and the margins and lower surfaces of leaves loosely hairy. Leaf blades 1.5-3 cm long, mostly ovate or deltoid-ovate, cauline only, margins entire or nearly so, evidently purple-tipped, rather short-petiolate, well distributed along the stem and only reduced toward the inflorescence. Bracts mostly elliptic or rhombic to obovate; calyx 2.5-5 mm long, the lance-triangular or nearly ovate teeth shroter than the tube and generally purplish; corolla ca. 5 mm long (Hitchcock, 1959, Vasc. Pl. Pacific Northwest, Part 4).

Range Comments
Sporadic and relatively infrequently established in parts of western and eastern North America, particularly the New England area (Kartesz 2009).

Mostly as roadside weeds in North America (Hitchcock 1959).

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Citation for data on this website:
Oregano — Origanum vulgare.  Montana Field Guide.  .  Retrieved on , from