Stems erect, rarely ascending to prostrate, branched, not hollow or sulcate.

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Trunk often dichotomously branched toward apex, to 16 m, apex not tomentose; bark gray or white-gray, smooth toward base of trunk; leaflets with midvein sulcate adaxially and margin revolute to slightly recurved; seeds 4.5-6 × 4-4.7 cm

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Stem simple or branched, terete, hollow except at nodes.

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Root terete, usually branched, 20-30 × 4-6 cm.

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Hepatophyta (marchantiopsida; liverworts) A phylum containing leafy and prostrate thallose forms, commonly known as liverworts, Thallose liverworts are prostrate and dichotomously branched with thalli several cells thick.

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Inflorescence terminal, much branched, thyrsoid, cymules of bisexual inflorescences each with several male flowers and a terminal female flower; bracts inconspicuous.

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At 4 wk, the cells in the liver bud migrated into the domain of transversum mesenchyme, where endothelial cells began to form vascular structures, and branched to form a number of hepatic cords.

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Leaf blade ovate or broadly ovate, apex sometimes inconspicuously tricuspidate, base often broadly cuneate; spikes or rarely few branched at base.

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Stems unarmed, sometimes with conspicuous lenticels, or bark sometimes shredding; branches often swollen at 3-7-lacunar nodes; pith continuous or interrupted by diaphragms at nodes; tendrils simple, bifurcate to trifurcate, or 4-12-branched, usually leaf-opposed, rarely tendrils absent.

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The results of calculation will be fundmentally consistent with the experimental values.In addition, we calculated dibenzene chromium and its derivatives, ferroceneand its derivatives. The former had higher symmetry. We studied the substituenteffects by calculating their NMR spectra. The results show that: when we add asubstitute group on one ring of dibenzene chromium, the substitute group will affecttwo benzene rings. The effect is similar to the effect of branched alkanes, namely:the effect on neighbouring groups has transmissibility. Furthermore, the nearer theneighbouring group is, the stronger the effect is. This effect is observed not only onthe substituted ring, but also on the unsubstituted ring.

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