馬氏射葉椰子學名Ptychosperma macarthurii (H.Wendl. ex H. J. Veitch) H. Wendl. ex Hook. f.、Ptychosperma bleeseri Burret、Ptychosperma hospitum (Burret) Burret、Ptychosperma julianettii Becc.、Actinophloeus macarthurii (H.Wendl. ex H.J.Veitch) Becc. ex Raderm.、Actinophloeus hospitus BurretSaguaster macarthurii (H. Wendl. ex H. J. Veitch) Kuntze、Actinophloeus bleeseri Burret、Kentia macarthurii H. Wendl. ex H. J. Veitch、Actinophloeus macarthurii var. hospitus (Burret) L. H. Bailey ex D. Fairchild、Carpentaria bleeseri (Burret) Burret,英文名Macarthur Palm、Macarthur Clusterpalm、Hurricane Palm、Macarthur Feather Palm,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,又稱青棕、麥克縐子棕、叢立麥氏椰子、棕櫚竹椰子、齒葉葵、麥氏葵,原產於新幾內亞至澳洲東北部,三至五幹叢生或單幹直立,莖基略膨大,基部有萌蘗生出,莖幹細長,高可達三至八公尺,徑約七至十三公分,綠色,幼莖偏青色,有明顯竹節狀葉鞘環痕,灰綠色,葉互生,葉叢生於莖幹頂,葉輪廓狹橢圓形、長卵形、橢圓形,向四方開展,羽狀全裂(羽狀複葉),裂片(羽片、小葉)八至三十對,裂片(羽片、小葉)互生或近對生,排列略整齊,裂片(羽片、小葉)闊線形,近基部則尖銳狀,裂端鈍截形,呈咬切狀,裂基楔狀漸狹,裂片(羽片、小葉)全緣,葉長一百至一百五十公分,寬六十至八十公分,裂片(羽片、小葉)長十四、十五公分,寬約九公分,葉質柔軟,葉面綠、青綠色,葉背面淡綠色,平行脈,中脈突起如脊,具葉鞘,基部葉鞘形成冠莖,無托葉,葉柄長約二十至四十公分,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,花序長約二十至七十公分,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,花淡黃、黃綠、黃白色,被片二層,外層被片(花萼)三枚,離生,截形,內層被片(花瓣)三枚,雄蕊多數,約十四枚,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,卵球形,長十三至十九公釐,有尖頭,尾急尖,約二公釐,熟時紅色,微酸,種子一枚,近橢圓形,起皺,具五稜,有槽溝,胚乳同質,胚基生。
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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