notes The location here appears to be near to the collection locality referred to as 'Yerba Buena' on 'Map 1', appearing on pg. 45 of the PDF version (available here) of the work: Thorne, R. F.; Moran, R. V.; Minnich, R. A. (2009). Vascular plants of the high Sierra San Pedro Mártir, Baja California, Mexico: an annotated checklist. Aliso, Vol. 28, pp. 1-50
Although the plant list there includes only the nominate subspecies Monardella macrantha ssp. macrantha, the stems and leaves here appear quite hairy (see the full size image). This suggests M. macrantha ssp. hallii, from the key break at couplet 3 in the Jepson eFlora Key to Monardella.
However, I'm not exactly sure what is meant by leaves 'ciliate' in the JM2 key...if it simply means spreading hairy along the leaf margin, then I'd have to go with subspecies hallii here. But if something else is meant (i.e. stiffer, spreading bristles along the leaf margin) then perhaps this is different than either subspecies mentioned in the JM2. (After all, I'd say the stem in this plant is more than the 'sparsely' hairy mentioned in the JM2.)
Perhaps it's worth noting the JM2 states that intermediates between the two subspecies are common...so perhaps the subspecies here are not that well differentiated, and the plant in this post is just a manifestation of another mode of variation in the species. However, note that plants with relatively glabrous leaves were found only a few miles to the west among boulders of the large meadow complex of Vallecitos (see post here). So the different forms don't appear to be geographically separated. (Though the location on the crest here is probably subject to harsher temps and winds, which may explain the hairiness as an adaption to environmental pressures.)
