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圆枝子楝树 |
中文学名:圆枝子楝树 界:植物界 门:被子植物门 纲:双子叶植物纲 目:桃金娘目 科:桃金娘科 亚 科:桃金娘亚科 族:桃金娘族 种:圆枝子楝树 |
圆枝子楝树(yuán zhī zǐ liàn shù),学名 Decaspermum teretis Craven,乔木,对30米高。 圆柱状的小枝,被绒毛的淡灰棕色。 叶柄6-10毫米,被绒毛; 叶片椭圆形到倒卵形, 7-8 * 2.5-3.7 厘米,革质,黄绿色干燥时, 正面深绿色和稍发亮干燥时, 最初两面短柔毛但是后脱落, 次脉12-15在中脉两边各, 花序在顶生叶的腋,聚伞状,产于 海南南部。 [1]
形态特征
乔木,对30米高。 圆柱状的小枝,被绒毛的淡灰棕色。 叶柄6-10毫米,被绒毛; 叶片椭圆形到倒卵形, 7-8 * 2.5-3.7 厘米,革质,黄绿色干燥时;
正面深绿色和稍发亮干燥时, 最初两面短柔毛但是后脱落, 次脉12-15在中脉两边各, 花序在顶生叶的腋,聚伞状,2.5-4厘米,3-8花;
苞片叶状,长方形, 10-15 * 5-8 毫米直径长约开花1.5厘米; 披针形的小苞片,长约3毫米,短柔毛。倒卵球形的Hypanthium,直径约2.5毫米, 被绒毛。
萼裂片5,近圆形,长约2.5毫米,先端圆形。 花瓣5,白色,,长约6毫米,具腺,先端圆形。 雄蕊红色,长于花瓣; 花丝短柔毛。 子房11-或室。
花柱与雄蕊等长; 柱头膨大。 近球形的果,直径约1厘米约5直径约1厘米。11-或12棱槽,短柔毛,11-或12室。花期7月。
Trees, to 30 m tall. Branchlets terete, grayish brown tomentose. Petiole 6-10 mm, tomentose; leaf blade elliptic to obovate, 7-8 × 2.5-3.7 cm, leathery, abaxially yellowish green when dry, adaxially dark green and slightly shiny when dry, both surfaces at first pubescent but glabrescent, secondary veins 12-15 on each side of midvein, at an angle of ca. 75° from midvein, and obscure, intramarginal veins ca. 1 mm from margin, base cuneate, apex acute.
Inflorescences in axil of terminal leaves, cymose, 2.5-4 cm, 3-8-flowered; bracts leaflike, oblong, 10-15 × 5-8 mm. Flowers ca. 1.5 cm in diam.; bracteoles lanceolate, ca. 3 mm, pubescent.
Hypanthium obovoid, ca. 2.5 mm in diam., tomentose. Calyx lobes 5, suborbicular, ca. 2.5 mm, apex rounded. Petals 5, white, obovate, ca. 6 mm, glandular, apex rounded. Stamens red, longer than petals; filaments pubescent.
Ovary 11- or 12-loculed. Style as long as stamens; stigma expanded. Fruit subglobose, ca. 1 cm in diam., 11- or 12-furrowed, pubescent, 11- or 12-loculed. Fl. Jul.
产地生境
● S Hainan. ● 海南南部
"Pyrenocarpa teretis" (Hung T. Chang & R. H. Miao, Acta Sci. Nat. Univ. Sunyatseni 1975: 64. 1975) belongs here but was not validly published because the genus name "Pyrenocarpa" was not validly published (see comment following genus description above). Pyrenocarpa teretis.