| 1. | Description : perennial herbs , 5 - 20 cm tall , densely white villose ; roots slender , terete , up to 40 cm long , fleshy , stem buried in sand with apical part emerged above ground 形态特徵:多年生草本,高5 - 20厘米,全株密被白色长柔毛;根细长,圆柱形,长达40厘米,肉质;茎大部埋藏于沙中,部分露出地面。 |