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Hedeoma todsenii
(Todsen's pennyroyal)

[taxon report][distribution map][all photos][line drawing]



Family: Lamiaceae

Scientific Name: Hedeoma todsenii R.S. Irving

Synonyms: None

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 piņon-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):

*Irving, R.S. 1979. Hedeoma todsenii (Labiatae), a new and rare species from New Mexico. Madroño 26:184-187.

*New Mexico Native Plants Protection Advisory Committee. 1984. A handbook of rare and endemic plants of New Mexico. University of New Mexico Press, Albuquerque.

*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

Agency Status:
Taxon USFWS State of NM USFS BLM Navajo Nation Natural Heritage NM Global Rank
Hedeoma todseniiEEEE.S2G2


Photo credits in header Peniocereus greggii var. greggii © T. Todsen,
Lepidospartum burgessii © M. Howard, Argemone pleiacantha ssp. pinnatisecta © R. Sivinski
©2005 New Mexico Rare Plant Technical Council