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Leaves petiolate or sessile ; leaf blade entire .

叶具叶柄或无梗；叶片全缘。

Leaves sessile or subsessile , base sometimes slightly clasping .

叶无柄或近无柄，基部有时的稍抱茎。

Plants white tomentose ; leaflets of radical leaves sessile .

植株白色被绒毛；胚根叶无柄的小叶。

Primitive multicellular marine animal whose porous body is supported by a fibrous skeletal framework ; usually occurs in sessile colonies .

原始的多细胞海洋动物，其多孔的身体由纤维性骨骼构架支撑；通常以固着的群体形式出现。

Stem leaves alternate , short petiolate or sessile .

茎生叶交替，短叶柄或无梗。