The Parasitism of Pedicularis lanceolata Michx., a Root Hemiparasite

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Abstract
Upon germination, seedlings of the swamp lousewort, P. lanceolata Michx., require hosts for continued development. Without hosts seedlings are stunted and chlorotic, whereas seedlings planted with clover (Trifolium incarnatum L.) or wheat (Triticum aestivum L.) as hosts were tall with expanded green leaves. In sterile culture, seedlings on a mineral nutrient medium with a low pH had growth similar to seedlings attached to hosts. At a higher pH, or when the medium was supplemented with sucrose, fructose, glucose, casein hydrolysate, glutamine, kinetin, GA or IAA, growth was stunted. It is probable that P. lanceolata relies on a host for an increased supply of water and minerals with little reliance on a host for organic compounds.

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