羅布麻(ma),為夾竹(zhu)桃科羅布麻(ma)屬(shu)直立半(ban)灌木,高可(ke)達(da)4米,枝(zhi)條對(dui)生(sheng)或(huo)(huo)互生(sheng),光(guang)滑無(wu)毛(mao)(mao)(mao),紫(zi)紅(hong)色或(huo)(huo)淡紅(hong)色。葉對(dui)生(sheng),葉片橢圓(yuan)狀(zhuang)(zhuang)披(pi)針(zhen)形(xing)至卵(luan)(luan)圓(yuan)狀(zhuang)(zhuang)長圓(yuan)形(xing),葉緣具(ju)細牙(ya)齒,兩面無(wu)毛(mao)(mao)(mao);圓(yuan)錐狀(zhuang)(zhuang)聚(ju)傘花(hua)序(xu)頂生(sheng)(有(you)時腋生(sheng))一至多歧,苞片膜質(zhi),披(pi)針(zhen)形(xing),花(hua)萼深裂,裂片披(pi)針(zhen)形(xing)或(huo)(huo)卵(luan)(luan)圓(yuan)狀(zhuang)(zhuang)披(pi)針(zhen)形(xing),兩面被短柔毛(mao)(mao)(mao),邊(bian)緣膜質(zhi),花(hua)冠圓(yuan)筒狀(zhuang)(zhuang)鐘(zhong)形(xing),紫(zi)紅(hong)色或(huo)(huo)粉紅(hong)色,花(hua)藥箭頭狀(zhuang)(zhuang),隱藏在(zai)花(hua)喉(hou)內,花(hua)絲短,密(mi)被白茸毛(mao)(mao)(mao)。其分布于(yu)中國(guo)新(xin)疆(jiang)、青海、甘肅、陜西(xi)、山(shan)西(xi)、河南、河北、江(jiang)蘇、山(shan)東、遼寧及內蒙(meng)古等省區,主要(yao)野生(sheng)在(zai)鹽堿荒(huang)(huang)地和沙漠(mo)邊(bian)緣及河流(liu)兩岸、沖(chong)積(ji)平(ping)原、河泊(bo)周圍及戈壁(bi)荒(huang)(huang)灘上,有(you)引種(zhong)栽(zai)培馴化。