Genus Sisymbrium L. (Rockets) In The Flora Of Latvia

Abstract

Single-phase Pr 2 CBr was prepared by heating a mixture of PrBr 3 , Pr and C (1 : 5:3) to 1140 • C for 18 d. The crystal structure was investigated by X-ray single crystal diffraction (space group P6 3 /mmc, a = 3.8071 (3), c = 14.7787(12)Å). In the structure the Pr atoms form C-centered octahedra condensed into Pr 2 C sheets via common edges; these sheets are separated by the Br atoms which are in a trigonal prismatic environment of Pr atoms. Pr 2 CBr is a black shiny compound with metallic conductivity. It is a ferromagnet with T c = 13.8(5) K.

Seed variability of Sisymbrium polymorphum (Murray) Roth (Brassicaceae) across the Central Palaearctic

“…The genus Sisymbrium L. (comprising about 50 species) typifies a lack of clear generic boundaries and unique synapomorphies ( Al-Shehbaz 1988 , 2012 , 2015 ; Warwick et al 2002 ; Warwick and Al-Shehbaz 2003 ; Rūrāne and Roze 2015 ). The first monograph ( Fournier 1865 ) on the genus listed 166 species, while Schulz (1924) , at the beginning of the 20 th century, accepted 77 species within the genus and divided it into 14 sections.…”