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白头树

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创建页面,内容为“{| class="wikitable" align="right" |- | style="background: #008080" align= center| '''<big>白头树</big> ''' |- |File:白头树2.jpg|缩略图|居中|250px|…”
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|[[File:白头树2.jpg|缩略图|居中|250px|[http://img1.iplant.cn/gotoimg/236/59EA31F70CBBA033.jpg 原图链接] [http://www.iplant.cn/info/Garuga%20forrestii?t=p 来自植物智]]]

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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

分布区域:[[云南]],[[四川]]

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'''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。
<ref>[http://www.iplant.cn/info/%B0%D7%CD%B7%CA%F7 白头树], 植物智, 2020-01-18</ref>

==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。
[[File:白头树1.jpg|缩略图|left|250px|[http://img1.iplant.cn/gotoimg/236/A61FE5A13F91BACE.jpg 原图链接] [http://www.iplant.cn/info/Garuga%20forrestii?t=p 来自植物智]]]

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.
==白头树生长环境==
[[File:白头树3.jpg|缩略图|left|250px|[http://img1.iplant.cn/gotoimg/236/89D93AE3519D6C65.jpg 原图链接] [http://www.iplant.cn/info/Garuga%20forrestii?t=p 来自植物智]]]
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.

==白头树分布范围==
白头树主要分布于[[云南]]、[[四川]]之[[金沙江]]谷地及[[云南省]]之[[怒江]]、[[澜沧江]]、[[红河]]河谷。

标本分布

[[广西]]: [[龙州]]

四川: [[屏山]]、[[会理]]、[[金阳]]、[[雷波]]

云南: [[昆明]]、[[禄劝]]、[[峨山]]、[[丽江]]、[[墨江]]、[[凤庆]]、[[蒙自]]、[[建水]]、[[金平]]

== 参考来源 ==
{{reflist}}

[[Category:370 植物學總論]]
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