These specimens of ruppia are characterized by possessing a small oval endocarp , smooth endocarp surface , distinct narrowly elliptic external depressions , distinct apical mucro , slightly curved seed shape and conspicuous globose hilum . a new species , r . yushensis sp . nov 该新种的主要特征为内果皮卵形、表面光滑、侧面具两个显著的窄椭圆形凹陷、顶端具一个明显的小尖突，以及种子顶端具显著的球形膨大的种脐。
