无支链的
Stems erect, usually unbranched. 茎直立，通常不分枝。
Stems erect, branched basally or unbranched. 茎直立，分枝或。
Stems erect or ascending, unbranched. 茎直立或上升，不分枝。
Stems unbranched or sometimes branched. 茎不分枝或者有时分枝。
Stems branched apically or unbranched. 顶部的茎分枝或者不分枝。
