細射葉椰子學名Ptychosperma angustifolium Blume、Actinophloeus angustifolium (Blume) Hort. ex Bailey,英文名Narrow-leaf Clusterpalm,棕櫚(檳榔)科射葉椰子(齒葉葵、射葉椰、皺子棕、縐籽椰、麥加縐子棕、海桃椰子、襞籽榔)屬灌木或小喬木植物,又稱射葉椰子、窄葉射葉椰子、細射葉椰,原產於新幾內亞,株高可達五公尺,幹徑約四、五公分,可達七公分,根際多生萌蘗,多幹叢生,莖幹直立,細長,光滑,不分枝,葉鞘痕環明顯,葉互生,叢生於幹頂,向四方開展,葉長卵形、橢圓形,羽狀全裂(羽狀複葉),裂片(羽片、小葉)四十七至五十枚,裂片(羽片、小葉)互生或近對生,排列整齊,裂片(羽片、小葉)闊線形,裂端鈍截形,呈咬切狀,裂基楔狀漸狹,裂片(羽片、小葉)全緣,葉長約一百一十至一百三十公分,寬約五十公分,著生稍亂,裂片(羽片、小葉)長約二十至四十公分,寬二至四公分,葉面綠色,平行脈,葉鞘不具纖維,先端有二枚突出物,無托葉,葉柄長約二十至三十公分,上面略凹,背面凸,基部斷面半圓形,單性花,雌雄同株,穗狀花序,花序長約三十公分,著生於葉鞘基部,成簇長出,花序軸呈金黃色,總花梗短,有分枝,下垂,花苞淡綠色,苞片佛焰苞狀,呈三角形,宿存,花小形,花被筒形,花黃綠、青白、黃白色,被片二層,外層被片(花萼)三枚,離生,截形,包覆果實至三分之一處,內層被片(花瓣)三枚,雄蕊多數,花藥丁字形,雌蕊心皮三枚,花柱線狀,略短,柱頭三裂,具不完全雄蕊,子房上位,子房三室,中軸胎座或邊緣胎座,每室具胚珠一枚,核果,漿果狀,多數,橢圓形,長五至七公釐,徑約五公釐,尾突,約二公釐,尾尖三反裂狀,熟時紫紅色,種子一枚,近橢圓形。
射葉椰子屬(Ptychosperma)常見之園藝品種有:
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Ptychosperma ambiguum
Ptychosperma angustifolium(細射葉椰子、射葉椰子)
Ptychosperma buabe
Ptychosperma burretianum(巴提青棕)
Ptychosperma caryotoides
Ptychosperma cuneatum
Ptychosperma elegans(海桃椰子)
Ptychosperma furcatum
Ptychosperma gracile
Ptychosperma halmaherense
Ptychosperma hartmannii
Ptychosperma hosinoi
Ptychosperma hospitum(奇異皺子棕)
Ptychosperma lauterbachii
Ptychosperma lineare(紫果穴穗椰、紫果穴穗棕)
Ptychosperma macarthurii(馬氏射葉椰子、齒葉葵、青棕)
Ptychosperma macrocerum
Ptychosperma mambare
Ptychosperma microcarpum
Ptychosperma mooreanum
Ptychosperma nicolai
Ptychosperma praemorsum
Ptychosperma propinquum(洋射葉椰子)
Ptychosperma pullenii
Ptychosperma ramosissimum
Ptychosperma robustum
Ptychosperma rosselense
Ptychosperma salomonense
Ptychosperma sanderianum(線射葉椰子)
Ptychosperma schefferi(穴穗皺籽椰、穴穗皺果棕)
Ptychosperma streimannii
Ptychosperma tagulense
Ptychosperma vestitum
Ptychosperma waitianum
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「馬氏射葉椰子」與「細射葉椰子」相似,判別分法:
1.馬氏射葉椰子:幹徑7-13公分,小葉長40~50公分,果實略大於細射葉椰子,種子有稜。
2.細射葉椰子:幹徑4-5公分,小葉長25~30公分,種子近橢圓形。
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