[taxon report][distribution map][all photos][line drawing]
Scientific Name: Hedeoma todsenii R.S. Irving
Vernacular Name: Todsen's pennyroyal
R-E-D Code: 2-1-3
Description: Rhizomatous, perennial herb, the rhizomes slender and unbranched; stems several, unbranched, clustered, somewhat woody at the base, 10-20 cm tall; leaves opposite, 8-15 mm long, 2.5-5.0 mm wide, sessile, oblong-lanceolate, tip rounded to acute, margins entire, lower surface glandular-dotted; flowers one to a few per stem, arising from the upper leaf axils; calyx 13 mm long, tubular, bilabiate, the teeth narrowly acute; corolla up to 3.6 cm long, tubular, bilabiate, red-orange to rarely yellow, red markings on the inner lip; fertile stamens 2; fruit of 4 nutlets with usually only 1 or 2 developing to maturity. Flowers July to September.
Similar Species: None
Distribution: New Mexico, Sierra and Otero counties, in the San Andres Mountains and on the western slope of the Sacramento Mountains.
Habitat: Plants grow in loose, gypseous-limestone soils associated with or positioned immediately below the Permian Yeso Formation; usually on steep north or east-facing slopes in piñon-juniper woodland; 1,900-2,300 m (6,200-7,400 ft).
Remarks: Reproduction appears to be almost completely vegetative; flowering, seed set, and seed viability are all low. This species was discovered in the late 1970s in the San Andres Mountains where it is now known from 14 sites; later it was found at 15 sites on Domingo and Mountain Lion peaks in the Sacramento Mountains.
Conservation Considerations: There are few human activities in the areas where this plant occurs, but events such as erosion or fire could affect populations. Problems of reproduction make re-establishment problematic.
Important Literature (*Illustration):
*New Mexico Native Plants Protection Advisory Committee. 1984. A handbook of rare and endemic plants of New Mexico. University of New Mexico Press, Albuquerque.
*Irving, R.S. 1979. Hedeoma todsenii (Labiatae), a new and rare species from New Mexico. Madroño 26:184-187.
*U.S. Fish and Wildlife Service. 2001. Todsen's pennyroyal (Hedeoma todsenii R.S. Irving) revised recovery plan. U.S. Fish and Wildlife Service, New Mexico Ecological Services Field Office, Albuquerque.
Information Compiled By:
Charlie McDonald, 1999; last updated 2009