旅人蕉樹干向棕櫚,高5-6米(mi)(原產地高可達(da)30米(mi))。葉(xie)2行(xing)排(pai)列于莖頂(ding),像一把大折扇,葉(xie)片長(chang)(chang)(chang)(chang)(chang)圓形(xing),似蕉葉(xie),長(chang)(chang)(chang)(chang)(chang)達(da)2米(mi),寬(kuan)達(da)65厘(li)(li)(li)米(mi)。花(hua)(hua)序腋生,花(hua)(hua)序軸每邊有佛(fo)焰(yan)苞5-6枚,佛(fo)焰(yan)苞長(chang)(chang)(chang)(chang)(chang)25-35厘(li)(li)(li)米(mi),寬(kuan)5-8厘(li)(li)(li)米(mi),內(nei)有花(hua)(hua)5-12朵,排(pai)成蝎尾狀(zhuang)聚傘花(hua)(hua)序;萼(e)片披針形(xing),長(chang)(chang)(chang)(chang)(chang)約20厘(li)(li)(li)米(mi),寬(kuan)12毫米(mi),革質(zhi);花(hua)(hua)瓣與(yu)萼(e)片相(xiang)似,惟中央(yang)1枚稍較狹小;雄蕊線形(xing),長(chang)(chang)(chang)(chang)(chang)15-16厘(li)(li)(li)米(mi),花(hua)(hua)藥長(chang)(chang)(chang)(chang)(chang)為花(hua)(hua)絲的(de)2倍;子房扁壓,長(chang)(chang)(chang)(chang)(chang)4-5厘(li)(li)(li)米(mi),花(hua)(hua)柱約與(yu)花(hua)(hua)被等長(chang)(chang)(chang)(chang)(chang),柱頭紡錘狀(zhuang)。蒴果開(kai)裂為3瓣;種子腎形(xing),長(chang)(chang)(chang)(chang)(chang)10-12厘(li)(li)(li)米(mi),寬(kuan)7-8毫米(mi);被碧藍(lan)色、撕裂狀(zhuang)假種皮(pi)。
旅(lv)人(ren)蕉(jiao)各葉的(de)(de)生命(ming)(ming)現像極為神奇有(you)(you)趣,通常每一成干長有(you)(you)20-22片(pian)(pian)(pian)(pian)大葉,兩(liang)端的(de)(de)葉片(pian)(pian)(pian)(pian)因葉柄(bing)彎折角度較(jiao)(jiao)大,不(bu)利于持續的(de)(de)誕生和養分之(zhi)輸送補充(chong)。故葉片(pian)(pian)(pian)(pian)之(zhi)凋萎是(shi)自左右(you)兩(liang)側之(zhi)部(bu)位開(kai)(kai)始,先是(shi)枯(ku)萎下垂(chui)一段時(shi)間(jian)后(hou)(hou)再告斷(duan)(duan)折,因此歲齡較(jiao)(jiao)長的(de)(de)旅(lv)人(ren)蕉(jiao),于其高(gao)(gao)直(zhi)之(zhi)莖(jing)頂(ding)兩(liang)側常可見(jian)到(dao)殘留的(de)(de)已斷(duan)(duan)折葉柄(bing)基部(bu),被栽(zai)育于庭園(yuan)者則是(shi)以人(ren)工(gong)鋸除,以求(qiu)平整美觀。而其生長情形,則是(shi)自莖(jing)頂(ding)正中處長出(chu)新葉,再于株(zhu)干逐漸抽高(gao)(gao)時(shi)慢(man)慢(man)朝往兩(liang)側舒展(zhan),約(yue)2~3年后(hou)(hou)原本位于莖(jing)頂(ding)中央的(de)(de)新葉,便會輾(zhan)轉(zhuan)到(dao)最兩(liang)邊之(zhi)位置而行將斷(duan)(duan)折入土(tu)。在旅(lv)人(ren)蕉(jiao)木質化之(zhi)莖(jing)干甫(fu)露出(chu)土(tu)表時(shi),約(yue)莫有(you)(you)10~12片(pian)(pian)(pian)(pian)的(de)(de)葉片(pian)(pian)(pian)(pian),待莖(jing)部(bu)朝上增(zeng)高(gao)(gao)而至(zhi)成株(zhu)時(shi)則會長有(you)(you)超過20片(pian)(pian)(pian)(pian)之(zhi)葉片(pian)(pian)(pian)(pian)。直(zhi)至(zhi)整株(zhu)旅(lv)人(ren)蕉(jiao)的(de)(de)生命(ming)(ming)末(mo)期,莖(jing)干將不(bu)再長高(gao)(gao),新葉也不(bu)再生出(chu),并從(cong)兩(liang)邊的(de)(de)葉片(pian)(pian)(pian)(pian)開(kai)(kai)始逐漸朝向中央依序(xu)斷(duan)(duan)折,最后(hou)(hou)再終止全株(zhu)之(zhi)生命(ming)(ming)。