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兰屿樫木 |
中文学名:兰屿樫木 拉丁学名:Dysoxylum cumingianum C. DC. 界:植物界 门:被子植物门 纲:双子叶植物纲 亚 纲:原始花被亚纲 目:芸香目 亚 目:芸香亚目 科:楝科 亚 科:楝亚科 族:鹧鸪花族,樫木亚族 属:樫木属 |
兰屿㭴木(lán yǔ jiān mù,学名:Dysoxylum cumingianum)为㭴木属下的一个种。产台湾兰屿。分布于菲律宾。 [1]
兰屿樫木形态特征
小乔木或乔木,达20(-30)米高。树皮平滑到具细裂缝,具皮孔。小枝纤细,具显著皮孔;具叶的顶芽为紧握的拳头状。叶螺旋状排列,对45厘米,奇数羽状复叶; 叶柄无毛,干燥时微黑,基部膨胀;小叶5-9; 小叶柄达6毫米;小叶叶片椭圆形到倒卵形, 8.5-18 * 3-7 厘米, 纸质到稍革质,无毛,基部楔形,有时多少不对称,先端明显渐尖,具1.2厘米渐尖头,次脉在主脉两边各7或9 (或10)。
聚伞圆锥花序多少腋生, 2-8(-25)厘米,被褐黄色微柔毛,分枝达5(-12)厘米。花萼浅杯状,3-6毫米,淡黄褐色短柔毛,边缘不规则5裂。花瓣(4或)5(或6),带白色, 7-10 * 1.8-2.2 毫米,通常无毛。雄蕊管截形到稍具细圆齿,外面疏生短柔毛;花药10,长约1毫米,着生在近边缘处。花盘1-1.5毫米高,里面具短柔毛,边缘具细圆齿。子房(3或)4或5室,每室具2并生胚珠;花柱下部2/3被短柔毛。蒴果直径达3厘米,扁平球状,(3-)5瓣裂,明亮带粉红色红色,无毛。 种子1-6,约1.8 * 1.5 厘米,具鲜橙色平凸肉质种皮。
嫩枝密被粗毛,后无毛。叶为奇数羽状复叶,长30厘米,有小叶7-9; 小叶对生或互生,膜质,椭圆形或卵状椭圆形,长(5-)12-16厘米,宽(3-)5-6厘米,先端钝而急尖,基部楔形,有时圆形,偏斜,干时黄褐色,叶面无毛,背面沿中脉和侧脉上密被微柔毛,侧脉每边12-14条,背面稍凸起。
圆锥花序线状,由枝上抽出,约与叶柄等长,长约8厘米,密被黄色粗毛;萼膜质,壶状,外被密粗毛,4齿裂;花瓣4,膜质,线状长椭圆形,长约15毫米,顶部被黄色小粗毛;雄蕊管圆柱状,无毛,狭裂,花药8,长椭圆形;花盘圆柱状,外面无毛,里面被倒毛;子房密被黄色长柔毛,4室.每室有胚珠1颗;花柱约与雄蕊管等长,中部被毛。
蒴果球形,直径2-2.5厘米,红褐色,4-5瓣裂。 [2]
Goniocheton arborescens Blume, Bijdr. 177. 1825.
Trees to 20(-30) m tall. Bark smooth to finely cracked, lenticellate. Twigs slender, prominently lenticellate; apical buds with leaves like clenched fists. Leaves in spirals, to 45 cm, odd-pinnate; petiole glabrous, drying blackish, base swollen; leaflets 5-9; petiolules to 6 mm; leaflet blades elliptic to obovate, 8.5-18 × 3-7 cm, papery to somewhat leathery, glabrous, base cuneate, sometimes ± asymmetric, apex conspicuously acuminate with acumen to 1.2 cm, secondary veins 7 or 9(or 10) on each side of midvein. Thyrses ± axillary, 2-8(-25) cm, tawny puberulent, branches to 5(-12) cm. Calyx shallowly cupular, 3-6 mm, fawn-colored pubescent, margin irregularly 5-lobed. Petals (4 or)5(or 6), whitish, 7-10 × 1.8-2.2 mm, usually glabrous. Staminal tube truncate to weakly crenulate, sparsely pubescent outside; anthers 10, ca. 1 mm, inserted near margin. Disk 1-1.5 mm high, inside pubescent, margin crenulate. Ovary (3 or)4- or 5-locular, with 2 collateral ovules per locule; style pubescent in proximal 2/3. Capsule to 3 cm in diam., flattened globose, (3-)5-valved, bright pinkish red, glabrous. Seeds 1-6, ca. 1.8 × 1.5 cm, planoconvex with bright orange sarcotesta.
Taiwan (Lan Yu) [Indonesia, Malaysia, Papua New Guinea, Philippines; Australia, Indian Ocean islands, Pacific islands].