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红鸡蛋花(Plumeria rubra Linn.)夹竹桃科、鸡蛋花属小乔木,高达5米;枝条粗壮,带肉质,无毛,具丰富乳汁。叶厚纸质,长圆状倒披针形,顶端急尖,基部狭楔形,叶面深绿色;中脉凹陷,侧脉扁平,叶背浅绿色,中脉稍凸起,侧脉扁平,仅叶背中脉边缘被柔毛;叶柄被短柔毛。聚伞花序顶生,总花梗三歧,肉质,被老时逐渐脱落的短柔毛;花梗被短柔毛或毛脱落,长约2厘米;花萼裂片小,阔卵形,顶端圆,不张开而压紧花冠筒;花冠深红色,花冠筒圆筒形,直径约3毫米;花冠裂片狭倒卵圆形或椭圆形,比花冠筒长;雄蕊着生在花冠筒基部,花丝短,花药内藏;心皮2,离生;每心皮有胚珠多颗。蓇葖双生,长圆形,顶端急尖淡绿色;种子长圆形,扁平,浅棕色,顶端具长圆形膜质的翅,翅的边缘具不规则的凹缺。花期3-9月,果期栽培极少结果,一般为7-12月。

原产于南美洲,现广植于亚洲热带和亚热带地区。中国南部有栽培,常见于公园,植物园栽培观赏。花鲜红色,枝叶青绿色,树形美观,为一种很好的观赏植物。

人口民族

人口

2020年,老挝共有约745万人口;老挝政府每隔10年举行一次人口普查,最近一次在2015年:20。全国人口分布不均,绝大多数人口居住于湄公河水系的谷地,万象的人口密度达209人每平方千米,而全国平均人口密度仅是27人每平方千米。老挝是多民族国家,因此“老挝人”更像是一个政治概念,指持有老挝国籍的人。总体上讲,老挝是亚洲人口最为年轻的国家,2019年的年龄中位数为21.6岁。

民族

过去习惯将老挝民族按照居住地势分为三大民族集团:老龙族、老听族和老松族。传统上,老龙族居于海拔700米以下的平原地区,老听族居于海拔700至1000米的丘陵地区,老松族居于海拔1000米以上的山地地区。近60%人口属于老龙族群的佬族,使用老挝语,佬族文化构成了老挝的主流文化。佬族是台语民族,和泰国的泰族、越南的泰族、缅甸的掸族、中国的傣族文化相通,他们在公元第一个千年内自华南地区南下,来到东南亚定居。在老龙族群内部,有区别于佬族的其他泰傣民族,如黑泰、白泰、红泰、傣那等,他们主要定居在坡地流域,而非湄公河冲积平原。

在老挝中部和南部的山区,主要是老听族群的分布地区,占总人口的30%。老听族大多使用孟-高棉语,本是老挝北部地区的原住民。山地则是老松族的居住地。老松族中有许多白苗、青苗人口,此外还有瑶族、掸族和一些使用藏缅语的族群。他们文化各异,约占人口的10%。老挝国内一些越南人、华人和泰人分布,主要居于城镇,不过不少此类外来人群都在20世纪40年代末离开老挝,移居到越南、香港或法国。

按照老龙、老听和老松划分民族的传统办法在近年来逐渐被老挝政府弃用,2005年,老挝中央建国阵线民族局发布《老挝人民民主共和国民族》,正式的将老挝民族划分为49个,并以母语归属划分族群,分为壮傣语族、孟-高棉语族、藏缅语族和苗瑶语族。

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