请问鹤虱主要分布在哪里，相关的研究文献有那些？

紫草科鹤虱属,主要分布于俄罗斯、中亚及中国西部地区。在新疆北部准噶尔盆地的戈壁荒漠地带有大量分布 ,是该区域中常见的一年生早春短命植物。
你可以参考以下文献：
1. Gituru W R ,Wang Q F,Wang Y,et al. Pollination ecology,breeding system,and conservation of Caldesia grandis(Alismataceae),an endangered marsh plant in China[J ]. Botany
Bulletin of Academia Sinica ,2002 ,43:231 - 240.
2.Jacquemart A L. Floral traits of Belgian Ericaceae species:are
they good indicators to assess the breeding systems[J ]. Begian Journal of Botany ,2003 ,136 2 :154 - 164.
3.Saunders N E,Sipes S D. Reproductive biology and pollination
ecology of the rare Yellowstone Park endemic Abronia ammophila Nyctaginaceae [J ]. Plant Species Biology,2006 ,21:75 - 84.
4.Johnston M O ,Schoen D J.Correlated evolution of self2fertili2
zation and inbreeding depression: An experimental study of nine populations of Amsinckia Boraginaceae [J ]. Evolution ,1996 ,50:1478 -1491.