© Bruce McNitt/Panoramic Images (Virginia)

Peter's Mountain mallow



Iliamna corei is an erect, herbaceous perennial with maplelike leaves normally arranged alternately, with margins entire to serrate. Similar in appearance to the hollyhock, I. corei can produce 15 to 20 flowers during its blooming season, which extends from June to August. Normally pink to rose, the odorless flowers, 2 in. in diameter, are actinomorphic and either are found in determinate cymose inflorescences or are solitary and axillary. The corolla is composed of five distinct, obovate, asymmetric petals attached to the base of the staminal column.       


The plant grows in direct sunlight on shallow sandstone outcrops on the northwest slope of the mountain near the ridge line of Peter’s Mountain, approximately 3,000 ft. above sea level. The mountain is hardwood-dominated. Pitch pine (Pinus rigida) is also present, but now, in the absence of the natural fires that once allowed it to be more prevalent, it cannot compete with less fire-intolerant hardwoods and so grows mainly on the rocky outcrops.


The Peter’s Mountain mallow is a globally rare species, known only from the Narrows, a site on Peter’s Mountain, in Giles County, Virginia. A similar mallow, I. remota, is found in Allegheny and Bedford counties and is also known from Indiana and Illinois.

Life History

When Iliamna corei was discovered in 1927, the population numbered only 50 plants. By 1992 the species had declined to only three plants. While the exact cause of this dramatic decline is not known, threats to the species include grazing by deer (and in one case, a feral goat), competition with other plants (particularly the Canadian leafcup, Polymnia canadensis), shading by trees, the proximity of hiking trails, and fire suppression.

Cross-pollination is required for development of viable seeds in I. corei. While its seeds are durable and have been shown to be viable after six years, scarification of the seed is required for germination. Fire also plays an important role in stimulating germination.


Peter’s Mountain mallow is listed as federally endangered and as state endangered in Virginia.

The Nature Conservancy of Virginia purchased the 398-acre Narrows Preserve specifically to protect Iliamna corei. Management and monitoring by the Conservancy and its partners are improving the survival chances of the species. Activities include caging plants to reduce herbivory, thinning the overstory, prescribed burns (It responded positively to a prescribed burn in 2001 and a small natural fire in 2004), removing competitors, eradicating invasive species such as the garlic mustard (Alliaria petiolata), and, to reduce herbivory, encouragement of deer hunting by special authorization.

Seed banking is also being explored by the North Carolina Botanical Garden (acting as regional arm of the Center for Plant Conservation), Virginia Tech, and the University of Virginia’s Blandy Experimental Farm.

Special thanks to the Riverine Chapter of the Virginia Master Naturalist Program for its assistance in developing this fact sheet.

Quick Facts

Virginia DCR - Natural Heritage Program
600 East Main Street; 24th Floor
Richmond, VA 23219

Contact Information

Phone: (804) 786-7951
Fax: (804) 371-2674


Founded in: 1986

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