percurrent

基本解釋

Secondary veins are semicraspedodromous and form marginal loops, tertiary veins are percurrent, quaternary veins form orthogonal or polygonal areoles filled up by branched and freely ended veinlets.
二級(jí)脈在葉緣內(nèi)分支，相互連接形成脈環(huán)，三級(jí)脈及頂型，脈間區(qū)內(nèi)充滿分支的自由結(jié)束的小細(xì)脈。
major veins impressed, rarely flat adaxially, lateral veins 7-10 pairs, tertiary venation weakly percurrent.
主脈凹陷，正面很少平，側(cè)脈7-10對(duì)，支脈弱頂。
percurrent proliferation
及頂增殖