Pollination Ecology of Pedicularis parryi ssp. purpurea (Parry) Carr (Scrophulariaceae)

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The pollination ecology of Pedicularis parryi purpurea growing in a drier, upland, sagebrush meadow was studied in association with P. bracteosa paysoniana immediately adjacent in a rich, moist willow thicket in the Teton Mountain Region of Wyoming. By insect exclosure, P. parryi purpurea was found to be Bombus pollinator-dependent. While both plants bloomed synchronously, had nectariferous corollas with similar nectars analyzed by refractometry and thin-layer chromatography, and shared the same eight Bombus pollinator species, P. parryi purpurea was pollinated primarily by short-tongued, sternotribic pollen-foragers and P. bracteosa by long-tongued, nototribic, nectar gatherers. Microscopic examination of 276 corbicular pollen loads from Pedicularis pollinators to determine pollenforaging constancy yielded 49% queens and 82% workers constant on P. parryi purpurea, 83% queens and 78% workers on P. bracteosa paysoniana. No putative hybrids between these species were identified ; hybridization in Pedicularis is considered rare or absent.
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