萼

Stamens shorter than sepals and petals, inserted on lateral surface of ovary; filament linear to ovate or obovate; anther connective appendaged or unappendaged.

雄蕊短于萼片和花瓣，子房的着生于侧面；花丝线形到卵形或倒卵形；花药药隔附属物或无附属物。

Petals white tinged with purple, blue, or purple-red; anther connective apically appendaged; leaf blade margin subentire to deeply crenate; sepals persistent

花瓣白色微染具紫色，蓝色，红色的或紫色；顶部的花药药隔是附属物；叶片边缘近全缘到具深圆齿；萼片宿存 5 N。

Sepals (3--)5(--7), usually greenish, occasionally dark reddish or purple, very rarely abaxial sepal appendiculate (R. angustisepalus), deciduous or, rarely, persistent. Petals (3--)5(--10), yellow, rarely white, exceptionally red, base shortly clawed, with foveolate adaxial nectary pit which is sometimes covered by a scale. Stamens numerous or rarely few.

萼片(3-)5(-7)，通常带绿色，偶有深色带红色或紫色，花瓣(3-)5(-10)，黄，很少白色，异常红色（不在本植物区，雄蕊多数或很少很少。

Sepals erect and outcurving or appressed in flower and fruit; leaf venation neither visibly reticulate nor conspicuous

萼片直立和外曲或贴伏的在花期和果期；叶脉既不明显网状也不明显 25

Sepals, petals, and ovaries 4- or 5-merous; disk unlobed, thick; seeds arillate

萼片，花瓣和子房瓣4或5；花盘不裂，厚；种子具假种皮 7

Sepals and petals 4- or 5-merous, ovaries only 2- or 3-merous; disk lobed or nearly nonexistent; seeds typically arillate, sometimes aril absent

瓣萼片和花瓣4或5，子房只瓣2或3；花盘浅裂的或差不多不存在；种子通常具假种皮，有时无 9

Sepals not aristate at apex, persistent.

萼片并非具芒的在先端，宿存。

Sepal apex not aristate; pistil 2-carpeled; style apex 2-fid; leaves oblong, elliptic, or subcordate; herbs perennial

萼片先端不具芒；雌蕊2心皮；花柱先端2裂；叶长圆形，椭圆形，或近心形；多年生草本 2 Herniaria 治疝草属

Leaf blade abaxially pilose or sparsely pubescent; teeth along bract margins and sometimes along leaf blade margins aristate and with a claviculate apical gland; hypanthium outside basally pilose to subglabrous; sepals margin sparsely ciliate.

叶片背面具柔毛的或疏生短柔毛；沿着苞片边缘和有时齿沿着叶片边缘具芒并且具具卷须顶端腺体；基部在外面的托杯具柔毛的到近无毛；萼片边缘疏生具缘毛。 21 C。 dolichadenia 长腺樱桃

The results are as below: 1. In Brasenia, 3 sepal primordia and 3 petal primordia initiated stimultaneously in each whorl. The first six stamen primordial initiated in a whorl stimultaneously, and the succeedings ones initiated in irregular spirals. Ascidiate carpel numerous, initiated in spirals.

结果表明： 1。莼菜的萼片和花瓣各3枚，都为轮状同时发生；雄蕊多数，除最早发生的6枚雄蕊原基为轮状同时发生外，其余均为螺旋状向心式发生；心皮多数，螺旋状向心式发生，为囊状型心皮。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。