羅布(bu)麻(ma),為夾竹桃科羅布(bu)麻(ma)屬直(zhi)立半灌木,高可(ke)達(da)4米,枝(zhi)條對(dui)生(sheng)或互生(sheng),光(guang)滑無毛,紫(zi)紅色或淡紅色。葉(xie)對(dui)生(sheng),葉(xie)片(pian)橢圓(yuan)(yuan)狀(zhuang)(zhuang)披針形(xing)至卵圓(yuan)(yuan)狀(zhuang)(zhuang)長圓(yuan)(yuan)形(xing),葉(xie)緣具細牙齒,兩(liang)面無毛;圓(yuan)(yuan)錐(zhui)狀(zhuang)(zhuang)聚傘(san)花(hua)(hua)序(xu)頂生(sheng)(有時腋生(sheng))一至多歧,苞片(pian)膜(mo)質(zhi)(zhi),披針形(xing),花(hua)(hua)萼(e)深裂(lie),裂(lie)片(pian)披針形(xing)或卵圓(yuan)(yuan)狀(zhuang)(zhuang)披針形(xing),兩(liang)面被(bei)短(duan)柔(rou)毛,邊緣膜(mo)質(zhi)(zhi),花(hua)(hua)冠(guan)圓(yuan)(yuan)筒狀(zhuang)(zhuang)鐘(zhong)形(xing),紫(zi)紅色或粉紅色,花(hua)(hua)藥箭頭狀(zhuang)(zhuang),隱藏在(zai)花(hua)(hua)喉內,花(hua)(hua)絲短(duan),密被(bei)白茸(rong)毛。其分布(bu)于中國新疆、青海、甘肅、陜西、山(shan)西、河南、河北、江(jiang)蘇、山(shan)東、遼寧及(ji)內蒙古等(deng)省(sheng)區,主要野生(sheng)在(zai)鹽(yan)堿荒地和沙漠(mo)邊緣及(ji)河流兩(liang)岸、沖積平原、河泊周圍及(ji)戈壁荒灘上,有引種栽(zai)培(pei)馴化。