Hedeoma hispida (Rough False Pennyroyal)
|Also known as:||Mock Pennyroyal|
|Habitat:||sun; dry sandy or rocky soil; prairies, along roads, railroads, waste areas, outcrops, gravel pits|
|Bloom season:||May - August|
|Plant height:||3 to 16 inches|
|Wetland Indicator Status:||none|
|MN county distribution (click map to enlarge):|
|National distribution (click map to enlarge):|
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Flowers are in whorls around the leaf axils in groups of 2 to 12, often with a distinct space between whorls. Individual flowers are blue to purple, about ¼ inch long, tubular with a notched upper lip and 3-lobed lower lip. The calyx is green, tubular, distinctly ribbed and hairy, with sharply pointed teeth.
Leaves and stem:
Leaves are narrow, about ¾ inch long and not more than 1/8 inch wide, toothless, hairy to varying degrees, with a blunt point at the tip, no stalk, and may be crowded on the stem or widely spaced. Stems are square, covered in short hairs, and unbranched or branched near the base.
Rough False Pennyroyal is a small plant with tiny flowers that can easily be overlooked. I have often found it growing in open prairie areas on the sandy mounds left by pocket gophers.
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- Rough False Pennyroyal plant, branched near the base
- Rough False Pennyroyal plants, mostly unbranched
- Rough False Pennyroyal with widely spaced leaves
- Rough False Pennyroyal in rock outcrop habitat
Photos by K. Chayka taken at Gneiss Outcrops SNA, Chippewa County, Wild River State Park, Chisago County, and in Ramsey County. Other Photos courtesy Peter M. Dziuk.
Have you seen this plant in Minnesota, or have any other comments about it?