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Pyrrolizidine alkaloids from Cryptantha species
New pyrrolizidine alkaloids found were threo -2″, 3″-dihydroxyechiumine, erythro -3″-chloro-2″-hydroxyechialine and 2″,3′-epoxyechiumines, which were new to the genus Cryptantha. Expand
The reproductive attributes of an endangered plant as compared to a weedy congener
Inflorescence output was the most important variable determining seed output and seed yield for both the rare and common species, whereas seed weight had no significant direct effect on seed output or seed yield. Expand
Pyrrolizidine alkaloid chemosystematics in Amsinckia
It is suggested that PAs can be used to distinguish sectional differences that are accompanied by chromosomal rearrangements, but not specific differences, as well as for 14 structurally related PAs. Expand
Pyrrolizidine alkaloids in overwintering monarch butterflies (Danaus plexippus) from mexico
North American populations of the monarch butterfly,Danaus plexippus, have been found to contain pyrrolizidine alkaloids and their N-oxides. Analytical methods (TLC, GC, and GC/MS) have beenExpand
Cryptantha nevadensis var. rigida elevated to species with a new name, C. juniperensis
A replacement name, Cryptantha juniperensis, is proposed for Cryptantha nevadensis because the name C. rigida was unavailable, due to its previous use for the South American Cryptantha rigida (Phil.). Expand
Trichome morphology relates to taxonomic diversity in Monardella (Lamiaceae) in the lower Snake River Watershed of Idaho and Oregon, USA: Taxonomic studies in Monardella (Lamiaceae) VI
Abstract. Monardella is a western North America genus ranging from the Rocky Mountains to the Pacific Ocean and from southern Canada to the southern tip of Baja California Sur. The levels ofExpand
Recognition of Two Species in Eremocarya (Boraginaceae): Evidence From Fornix Bodies, Nutlets, Corolla Size, and Biogeography
Evidence is presented that these two varieties of Eremocarya are distinct in a number of features and that they should be treated as separate species: E Remocarya lepida and E. micrantha. Expand
Pyrrolizidine alkaloids from Amsinckia
Abstract In conjunction with a chemosystematic analysis of the genus Amsinckia , the novel pyrrolizidine alkaloids tessellatine and 3′,7-diacetylintermedine were isolated and structurally elucidatedExpand
Pectocarya anisocarpa, a new species of Boraginaceae, and a revised key for the genus in western North America
The name P. anisocarpa is validly published and illustrations, an image of the holotype specimen, and a range map of the new taxon are provided, as well as a revised taxonomic key and photographs of the fruits of the North American Pectocarya taxa. Expand