三叶虫在房屋周围飞来飞去，发出超声波信号，绘制出房间的地图，以备日后清洁时使用。
The Trilobite scuttles around homes emitting ultrasound signals to create maps of rooms, which are remembered for future cleaning.
叶互生，具叶柄，薄革质或纸质，上半部边缘具牙齿，很少全缘，侧脉2或3对，低的离基三出脉。
Leaves alternate, petiolate, thinly leathery or papery, margin dentate in apical half , rarely entire, lateral veins 2 or 3 pairs, lowest triplinerved.
箭叶橐吾的三个自然居群，总计62个个体，使用17个随机引物，共扩增出128个多态位点。
Three natural population of l. Sagitta, add up to 62 individual, with 17 random primers, 128 polymorphic loci.
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