光穗旱麦草 2) E.DISTANS 毛穗旱麦草 3) Silene jenisseensis willd 旱麦瓶草 4) Eremopyrum 旱麦草属 1. The Characteristics of Fruit-set and Reproductive Package in Four Species of Ephemeral Plants inEremopyrum(poaceae); 旱麦草