Premium
MODE OF ATTACHMENT, HAUSTORIUM STRUCTURE, AND HOSTS OF PEDICULARIS CANADENSIS
Author(s) -
Piehl Martin A.
Publication year - 1963
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1963.tb06579.x
Subject(s) - haustorium , biology , parasitism , obligate parasite , scrophulariaceae , orobanchaceae , parasitic plant , botany , xylem , orobanche , intraspecific competition , host (biology) , ecology , germination
Piehl, Martin A. (Botanic Garden, Santa Barbara, Calif.) Mode of attachment, haustorium structure, and hosts of Pedicularis canadensis. Amer. Jour. Bot. 50(10): 978–985. Illus. 1963.—Although long known for European members of the genus, parasitism is documented for the first time for the North American Pedicularis canadensis (Scrophulariaceae) from observations made in the field. Every stand examined showed evidence for parasitism, the haustorial connections being established in the seedling stage. The haustoria, which vary somewhat morphologically, produce direct connection between the xylem of the host and that of the parasite. The great diversity of hosts, involving 80 species from 35 families, suggests that connections may be made to essentially any vascular plant with subterranean parts in proximity to those of the parasite, although some species are parasitized much more frequently than others. In addition, haustorial attachments were found to dead parts of vascular plants and, in single instances, to a fungus and small pebbles. Intraspecific parasitism has also been observed.