以下为句子列表：
英文: Inflorescence an axillary heads; flowers bisexual, petals 5, white, ribbon-like, 1.5 cm long; stamens 5, filaments very short, anthers ovoid, with 2 pollen sac opening each by 2 vertical valves, connectives exserted; staminodes 5, bifid.
中文: 头状花序腋生，花两性，花瓣5，白色，带状，长1.5厘米；雄蕊5，花丝极短，花药卵形，具2个各2瓣裂的花粉囊，药隔突出；退化雄蕊5，叉状分裂。
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英文: Pollen sac A chamber in which the pollen is formed in the angiosperms and conifers.
中文: 花粉囊：在被子植物和针叶类中形成花粉的小室。
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英文: Stomium (pl. stomia) The site at which a sporangium or pollen sac ruptures to release the spores or pollen.
中文: 裂口：孢子囊或花粉囊的开裂位置，小孢子或花粉粒从中散出。
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