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The basic structure of the inflorescence is the cyme (branchlets arising from the bracteole axils, the bracteoles serving as bracts for upper flowers), which can be reduced to one flower with two bracteoles and a bract. Units of dispersal vary considerably (capsules opening with lower part persistent, flower and bracteoles falling together, or cymose partial inflorescences breaking off above bract) and can be characteristic for genera. Several genera possess long trichomes serving dispersal at the base of the tepals.

花序的基本的结构是聚伞花序小枝起因于bracteole腋,散布的单位变化多样(蒴果开裂下半部分的宿存,花和小苞叶一起脱落,或部分聚伞花序在苞片以上裂开并且可以作为属的特征一些属在花被片的基部有长的毛状体用于散布Digera arvensis Forssk吗?

Flowers bisexual or unisexual, rarely polygamous, actinomorphic or zygomorphic, solitary or in axillary or terminal, spicate, paniculate, or racemose inflorescences, 2-bracteolate, sometimes cleistogamous. Sepals 5, equal or unequal, imbricate, persistent.

花两性或单性,很少杂性,辐射对称或左右对称,单生或为腋生或顶生的穗状花序、圆锥花序或总状花序,有两个小苞片,萼片5,相等或者不相等,覆瓦状的,宿存。

Perianth segments connate into a tube, with 5 membranous teeth at apex; perianth adaxially with an acicular appendage adnate to it in fruit; axil of bractlets with a fascicle of villous hairs.

花被片合生成筒,有5颗膜的牙齿在先端;花被正面有一针状附加物贴生于它在果期;有一个具长柔毛的头发的密簇聚伞花序的小苞片腋。

Inflorescence an axillary glomerule, on normal leafy stems or on specialized, slender, mostly axillary, occasionally terminal, shoots, these unbranched and spikelike to branched and panicle-like, mostly unisexual, less often bisexual.

花序一腋生的团伞花序,正常茎或特化的纤细的多叶茎上,花单性的;苞片和小苞片小,干膜质。

Flowers unisexual, hypogynous; staminate flowers in erect, terminal panicles; pistillate flowers 1 to few in short terminal or axillary racemes; bracts present; bracteoles 1 pair per pedicel, usually caducous.

花单性,下位;在直立,顶生的圆锥花序里的雄花;雌花1到很少为短的顶生或腋生总状花序;苞片宿存;小苞片1 每花梗配对,通常早落。

Flowers bisexual, zygomorphic, shortly pedicellate, in racemes or panicles, axillary or terminal; bracts and bracteoles present.

花两性,左右对称,有短花梗,在总状花序或圆锥花序,腋生或顶生里;苞片和小苞片宿存。

Inflorescences axillary, ramiflorous, cauliflorous, or terminal, simple or rarely compound, with flowers borne laterally either in pairs or sometimes singly, racemose, sometimes spicate, paniculate, or condensed into a head; bracts subtending flower pairs usually small, sometimes accrescent and woody; floral bracts usually minute or absent.

腋生的花序,枝花,茎生花,或者顶生,单和很少复合,苞片与花对生通常小,有时增大并且木质化;花的苞片通常小或者无。

The reproductive development process of birch was described as follows: Male inflorescences extended from apical bud in early June. In later June, stamen primodium was differentiated in the bract of male inflorescence and the differentiation of bract was generated in female inflorescence. During July, anther layers and archesporial cell were differentiated in anther, then archesporial cell developed into mother microspore cell. Pistil primodium came into being at the same time. In early part of August the meiosis of mother microspore cell started. In later August, mono-nucleus microspore was formed. After September, both male inflorescence and female inflorescence were dormant.

白桦的生殖生长发育过程如下:6月初,雄花序从顶芽中生长出来。6月中下旬,雄花序苞片上分化出雄蕊原基,雌花序分化出苞片。7月,雄花花药分化出花药壁和孢原细胞,孢原细胞演化为小孢子母细胞,雌花序苞腋处分化出雌蕊原基;8月中上旬,小孢子母细胞减数分裂,8月下旬形成单核小孢子;9月后雄花序以单核小孢子状念越冬,雌花序以雌蕊原基状念越冬。

Cymes terminal or axillary, crowded or often dichotomously branched spreading panicles, bracteate or ebracteate.

聚伞花序顶生或腋生,拥挤或者经常二歧分开传播圆锥花序,具苞片或者无苞片。

Leaves simple, usually alternate, rarely opposite or verticillate, sometimes crowded at apices of branches; stipules usually small and caducous, sometimes larger, leaflike and persistent, rarely absent; petiole generally present, sometimes with apex 2-glandular and/or with additional glands along petiole length; leaf blade usually pinnate-veined, sometimes 3-5-veined from base or palmate-veined, with or without pellucid dots or lines, sometimes with a pair of glands at junction of blade and petiole, margin entire or toothed, teeth glandular or not. Inflorescences axillary, terminal, or cauliflorous, of various forms: racemose, spicate, cymose, corymbose, or paniculate, sometimes flowers fasciculate, or solitary; pedicels often articulate; bracts and bracteoles usually small to minute.

单叶,通常互生,很少对生或轮生,有时在枝端簇生;托叶通常小并且早落,有时大,叶状并且宿存,很少无;叶柄通常存在,有时先端有2个腺体,或沿着叶柄有腺体;叶片通常羽状脉,有时基部3-5出脉或掌状脉,有或无透明小圆点或线,花序腋生,顶生,或者茎生,或多种形式:总状,穗状,聚伞状,伞房状,或者圆锥状,有时花束状,或者单生;花梗通常有节;苞片和小苞片通常小到微小。

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