苞

Flowers in 2 rows per bract; flowers in proximal bracts female or bisexual; flowers in distal bracts male.

花生于2排在每苞片；花生于下部的苞片雌性或两性；花生于上部的苞片雄性。

Secondly, according to the stem and leaf anatomy, leaf epidermis, pollen morphology and floral development, it is found that there are no close relations between Acorus and Typhales, especially in the aspect of floral development. In the course of floral development of A. calamus, neither bracteloe primordium nor common primordium occurs in the whole course. Early development of the flower is strongly unidirectional. Three shield carpels develop into a pistil. In Sparganium fallax, each female flower has a bracteole. The bracteole primordium and the floral primordium originate from a complex structure. A single saccate carpel develops into a pistil. In staminate flowers, petal and stamen primordia initiate spirally.

菖蒲属与香蒲目的茎叶解剖特征、叶表皮特征、花粉特征及花器官发生特点等亦存在着明显区别，特别是花器官发生特点差异尤为显著，如菖蒲属花器官发生过程中，没有苞片原基，也不存在任何形式的复合原基，花被与雄蕊原基均以单向性方式发生，雌蕊由3心皮发育而成，具有"盾状心皮"的特点等，黑三棱属则有苞片原基发生，且苞片原基与雌花原基起源于共同的复合结构，雄花的花被原基和雄蕊原基均以螺旋状方式发生，雌蕊由单心皮发育而成，未发现有2或3个心皮原基或其痕迹的现象，体现出"囊状心皮"的特点。

One of the bracts of the involucre in the Compositae.

总苞片 Tegule 菊科总苞的一枚苞片。

Bract and bracteoles or bract at calyx base forming epicalyx, persistent.

在花萼基部的苞片和小苞片或苞片形成副萼，宿存。

Flowers epigynous, small, bisexual or staminate, regular, in simple or compound umbels; umbellules few to many-flowered; rays often subtended by bracts forming a involucre; umbellules usually subtended by bracteoles forming an involucel.

花上位，小，两性或者雄性，整齐，组成单一或者复合的伞形花序；小伞形花序有花少数至多花；舌状花通常被苞片（形成一个总苞包着；小伞形花序通常被小苞片包着。

Botany A small, thin, usually dry, often appressed plant structure, such as any of the protective leaves that cover a tree bud or the bract that subtends a flower in a sedge spikelet.

鳞苞：一种小而薄的，通常是干的紧贴植物结构，如任一种覆盖树苞的保护性叶片或莎草属植物的小穗中包住花朵的苞片

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。

Racemes ebracteate or basally bracteate, rarely bracteate throughout, corymbose, elongated or not in fruit.

基部具苞片，很少具苞片的总状花序无苞片或全部，在果期没有的伞房状，拉长的或。

A two-year study on the effects of three densities D1, 80±5 stemsm^(-2; D2, 140±8 stemsm^(-2); and D3, 220±11 stemsm^(-2) of Fargesia denudate in a F. denudata-Picea purpurea natural forest on the F.

在缺苞箭竹－紫果云杉原始林下，选取3个密度(D1、D2、D3)的缺苞箭竹，研究了密度对缺苞箭竹凋落物量、养分归还量及养分利用效率的影响。

Cymes solitary or dichotomously branched, ebracteate or lower pedicels bracteate, rarely all bracteate (flowers extra-axillary).

或者二歧分开的聚伞花序单生，无苞片或者下部花梗具苞片，很少全部具苞片。

He and Nina moved to California and lived at 2005 Ivar Street, Apt.

他和Nina搬到加州，并在2005年伊瓦尔街，公寓生活。

Droperidol （ potently inhibits transfected HERGchannels and this is the probable mechanism for QT prolongation.

氟哌利多有效地抑制了转染的 HERG 钾通道，可能是 QT 间期延长的机制。