密花樫木
密花樫木 |
中文学名:密花樫木 拉丁学名:Dysoxylum densiflorum (Bl.) Miq. 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 属:樫木属 种:密花樫木 |
密花樫木,学名 Dysoxylum densiflorum (Bl.) Miq.,楝科樫木属植物。产云南西双版纳(勐腊、景洪)。 [1]
目录
密花樫木形态特征
常绿乔木,高可达25米;树皮灰黄色,小块状剥落,内皮淡黄色。一年生小枝被柔毛,叶互生,长35-46厘米,叶轴密被黄色柔毛;小叶7-15,互生或近对生,纸质,长圆形,长9-16厘米,宽3-6厘米,先端渐尖或短渐尖,基部偏斜,侧脉10-14对,顶生小叶倒卵状长圆形,小叶叶面仅沿中脉有毛,背面沿脉密被黄色柔毛;小叶柄长4-6毫米,密被柔毛。花组成总状花序,着生于二年生或多年生的老枝上;花序单生或2-3(-10)个簇生,长5-9厘米,轴上密被柔毛。花梗长2-4毫米,密被柔毛。
花淡黄色,长8-10毫米;萼杯状,高3-4毫米,裂片4,三角形,外面被短柔毛,内面无毛;花瓣4,长圆形,长6-8毫米,宽约2毫米,外面被疏短柔毛,内面无毛;雄蕊管长6-8毫米,径约3毫米,内外两面均被疏柔毛,先端具8个小裂片,每裂片端部又浅裂为2齿,花药8枚,略低于雄蕊管缘;花盘管状或呈坛状,高约2毫米,无毛,上面波状;子房内藏于花盘内,密被粗毛,4室,花柱长8毫米,被疏长柔毛,柱头盾形。
蒴果黄绿色,椭圆形或倒卵形,果皮密被黄色粉状短毛;近轴一侧常稍压扁,果长4-6厘米,直径2.5-4厘米。种子鲜红色,具僧帽状橙色假种皮。花期4月及9月,果期4-5月及10-11月。
Dysoxylum densiflorum (Bl.) Miq. Ann. Mus. Bot. Lugd. Bot. 4: 9. 1868; Koord. et Valeton in Bijdr. Booms. Java 3: 41. 1896, et in Atlas Baunarter fig. 98. 1913; Backer in Fl. Java 2:122. 1965; 邹寿青, 云南植物研究11(2): 155-1989; ——Epicharis densiflora Bl. Bijdr. 167. 1825.
Trees to 25 m tall, evergreen. Bark exfoliating, endodermis yellowish. Young shoots pubescent. Leaves alternate, 35-46 cm, odd-pinnate; rachis densely yellow pubescent; leaflets 7-15, opposite to subopposite; petiolules 4-6 mm, densely pubescent; leaflet blades oblong but apical one obovate-oblong, 9-16 × 3-6 cm, papery, abaxially densely pubescent along veins, adaxially only on midvein, secondary veins 10-14 on each side of midvein, base oblique, apex acuminate to shortly acuminate. Thyrses on older branches and sometimes axillary, solitary or 2- or 3(-10)-conglomerate, 5-9 cm, rachis densely pubescent. Flowers yellowish, 8-10 mm. Pedicel 2-4 mm, densely pubescent. Calyx cup-shaped, 3-4 mm, 4-lobed; lobes triangular, outside sparsely pubescent, inside glabrous. Petals 4. Staminal tube 6-8 × ca. 2 mm, both surfaces sparsely pubescent, margin 8-lobed, each lobe tip 2-cleft as 2 teeth; anthers 8, slightly included within tube. Disk tubular to urceolate, ca. 2 mm high, glabrous, apex undulate. Ovary included in disk, densely covered with thick trichomes, 4-locular; style ca. 8 mm, sparsely villous; stigma peltate. Capsule yellowish green, ellipsoid to obovoid, 4-6 × 2.5-4 cm; pericarp densely covered with pulverulent yellow trichomes. Seeds bright red, with a salmon-colored aril. Fl. Apr and Sep, fr. Apr-May and Oct-Nov.
密花樫木生长环境
生长于海拔520-800米的湿性热带季节性谷边、河边坡地的雨林中。[2]