白头树
| 白头树 |
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中文学名:白头树 拉丁学名:Garuga forrestii W. W. Smith 界:植物界 门:被子叶植物门 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:橄榄科 属:嘉榄属 种:白头树 |
白头树是一种落叶乔木，高10—25米，幼枝密被柔毛，老枝无毛，紫褐色，有纵条纹及明显的叶痕。 [1]
目录
白头树形态特征
小叶近无柄，披针形至椭圆状长圆形，顶端渐尖，基部圆形或阔楔形，具浅齿，有小托叶。最下一对小叶小，长约1厘米，常早落 ；中间一对长7—12厘米，宽2—4厘米，侧脉10—16对；顶生小叶长5—7厘米，具柄，柄长约1.5厘米。圆锥花序侧生和腋生，常多数聚集于近小枝顶部，长14—25（—35）厘米，多次分枝，花轴及分枝纤细，密被直立的柔毛。
花白色，长约3毫米，花托杯状，外被绒毛；萼片近钻形，长0.2厘米，两面被毛；花瓣卵形，长约3毫米，外被绒毛；雄蕊近等长；子房无柄，球形，和花柱被疏柔毛，柱头5浅裂。果序有许多不结实的线形花梗。
果近卵形，一侧肿胀，横切面多少呈钝三角形，长0.7—1厘米，直径0.6—0.8厘米，两端尖，先端具喙而偏斜一侧，基部有宿存的浅杯状花萼。花期4月，果期5—11月。
Trees, 10-15(-20) m tall. Branchlets densely pubescent when young, glabrescent, purple-brown, longitudinally striped and conspicuously lenticellate. Leaflets 11-19, nearly without petiolules; blades lanceolate or elliptic-oblong, densely pubescent when young, glabrescent, base rounded or broadly cuneate, margin shallowly serrate, apex acuminate, lowest pairs small, ca. 1 cm, often early deciduous, middle pairs 7-12 × 2-4 cm, with lateral veins 10-16 pairs, terminal leaflet 5-7 cm, with petiolule ca. 15 mm. Panicles 14-25(-35) cm, axillary or lateral, usually crowded toward ends of branchlets, multibranched; rachis and branches slender, densely tomentose. Flowers white, ca. 3 mm; receptacle cup-shaped, abaxially tomentose. Sepals nearly subulate, ca. 2 mm, hairy on both surfaces. Petals ovate, ca. 3 mm, abaxially tomentose. Stamens nearly equal. Ovary sessile, globose; style sparsely pubescent; stigma shallowly 5-lobed. Infructescence with many linear pedicels without fruits. Drupe nearly ovoid, one side dilated, 7-10 × 6-8 mm, ± obtusely deltoid in cross section, attenuate at both ends, apex with a point, base with persistent shallowly cupular calyx. Fl. Apr, fr. May-Nov.
Garuga forrestii W. W. Smith in Not. Bot. Gard. Edinb. 13: 162. 1921; Hand. -Maza. Symb. Sin. 7:631. 1933, Kalkm. in Blumea 7 (2): 461, fig. 2. 1953; 云南植物志1: 461, 图版45: 10-14. 1977; 云南种子植物名录, 上册826. 1984.——G. yunnanensis Hu in Bull. Fan Mem. Inst. Biol. Bot. ser. 7: 212. 1936.