A study of the flavonoids of the Potentilla pensylvanica complex in North America

1977 ◽  
Vol 55 (4) ◽  
pp. 476-479 ◽  
Author(s):  
B. L. Kohli ◽  
K. E. Denford
Keyword(s):  
North America ◽  
Flavonoid Glycosides ◽  
Polyploid Series

The major flavonoid complement of leaves of the polyploid series Potentilla finitima Kohli & Packer (2n = 14), P. pensylvanica L. (2n = 28), and P. bipinnatifida Hook. (2n = 56) has been determined. Eleven flavonoid glycosides have been identified and their distribution within the polyploid series plotted and discussed. Evidence is presented for the occurrence of a 'recombinant' flavonoid in the species P. pensylvanica L.

A contribution to the taxonomy of the Oxytropis campestris complex in northwestern North America

1980 ◽  
Vol 58 (16) ◽  
pp. 1820-1831 ◽  
Author(s):  
Wayne J. Elisens ◽  
John G. Packer
Keyword(s):  
North America ◽  
Chromosome Number ◽  
Cell Size ◽  
Guard Cell ◽  
Chromosome Numbers ◽  
Species Status ◽  
Polyploid Series ◽  
Continental Divide ◽  
Northwestern North America

The Oxytropis campestris complex in northwestern North America is a polyploid series comprising at least seven morphologically and geographically distinct taxa. In light of the data of the present study, the authors propose that five taxa be reelevated to species status: O. cusickii Greenm., O. monticola Gray, O. columbiana St. John. O. jordalii Porsild, O. varions (Rydb.) K. Schum.; and that two taxa be recombined as subspecies: O. monticola Gray ssp. dispar (A. Nels.) Elisens & Packer and O. jordalii Porsild ssp. davisii (Welsh) Elisens & Packer.Three different chromosome numbers are present in the complex and represent the tetraploid (2n = 32), hexaploid (2n = 48), and dodecaploid (2n = 96) condition. Three species have uniform chromosome numbers (O. cusickii, 2n = 48; O. jordalii, 2n = 32; and O. columbiana, 2n = 48), two taxa, O. varians and O. monticola ssp. monticola, exhibit two different chromosome numbers. No attempt to subdivide O. varians was undertaken as; with the exception of guard cell size, no differences were observed between hexaploid and dodecaploid representatives. At least two distinct entities appear to be present in O. monticola ssp. monticola, for, while morphologically, cytologically (2n = 32), and ecologically uniform east of the continental divide, it is quite variable in appearance and has a different chromosome number (2n = 48) west of the divide.

Flavonoids and affinities of some North American lupines

1983 ◽  
Vol 61 (3) ◽  
pp. 708-730 ◽  
Author(s):  
K. W. Nicholls ◽  
B. A. Bohm
Keyword(s):  
United States ◽  
North America ◽  
Principal Components Analysis ◽  
Principal Components ◽  
North American ◽  
Southeastern United States ◽  
Flavonoid Glycosides ◽  
Structural Modifications ◽  
Components Analysis

Seventy-three taxa of the genus Lupinus in North America have been studied for their flavonoid constituents. In all, 56 compounds were isolated and either partially or totally characterized. Flavonoid types encountered were flavones, C-glycoflavones, isoflavones, flavonols, and, tentatively, flavanones. Further structural modifications seen were O-methylation, O-glycosylation at a variety of positions and acylation of several of the flavonoid glycosides. Principal-components analysis was performed on (i) presence–absence data of individual compounds with consideration given to relative concentrations and (ii) presence–absence of the types of flavonoid structures. Several groupings of taxa emerged from these analyses based upon the presence of unique compounds or combinations of compounds. In a number of these groups the chemical affinities paralleled morphological affinities closely. In all, 10 groupings were seen. Lupinus diffusus, a simple-leaved taxon from southeastern United States, stood apart from all groups.

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