二歧的

Branches 3-6 mm in diam.; inflorescence a compound dichasium or polychasium

分枝3-6毫米直径；花序一复合的二歧聚伞花序或多歧聚伞花序 32

Inflorescence a simple or compound monochasium, dichasium, simple or compound raceme, or flowers solitary.

花序单或者复合的单歧聚伞花序，二歧聚伞花序，单或者复总状花序或者单生花。

As a result of analysis to many of the results of experiment, checked up on specimens, field investigation and combining with the theories of palaeobotany, comparative morphology, evolutional morphology of vascular plants and taxonomy, it can be concluded as following: the primitive sorts of Cycadaceae are the sorts that pinnate leafs are dichotomy; among these, the sort that pinnate leafs are tripinnate-dichotomy is most primitive, from this sort gradually evolve to bipinnate-dichotomy, to only for monopinnate-dichotomy, from this sort evolve to the sorts that pinnate leafs are simply pinna; among the sorts of simply pinna, the species that segments of megasporophyll possess much more triplicate to monodichotomy are most primitive.

经过大量的实验结果分析、查阅标本和野外调查，结合古植物学、比较形态学、演化植物学和分类学等理论进行分析，认为苏铁科原始的类型为羽叶呈二歧状分叉的种类，其中最原始的又是羽叶呈三回二歧状分叉的种类，从这个羽叶类型逐渐演化出一回二歧状分叉的羽叶类型，再演化出羽叶为单羽状的类型；而单羽状叶的类群中，又以大孢子叶侧裂片具三回、二回及一回二歧状分叉数量多的种类为最原始，而侧裂片二歧状分叉数量少的为较进化，侧裂片无二歧分叉的如拳叶苏铁类为最进化的种类。

Herbs annual or perennial. Stems creeping or suberect, with dichotomous branching.

一年生或多年生草本茎匍匐或近直立，具二歧的分枝。

Stem finely striate, dichotomously branched above.

茎细条纹，二歧的上面分枝。

Flowering stems not or not obviously dichotomously branched; if pedicels of fallen flowers persistent and exserted, then outer perianth segments crested.

花茎并非或并非明显二歧的分枝；如果脱落花的花梗宿存和外露，然后外部花被片达到顶点。

Basal leaf 1, palmatisect, veins dichotomously branched, not anastomosing; staminodes present

基部的叶1，掌状全裂，脉二歧的分枝，不网结；存在的退化雄蕊 31 Kingdonia 独叶草属

Flowering stems dichotomously branched; pedicels of fallen flowers persistent, exserted from spathes, stiff; outer perianth segments not crested.

花茎二歧的分枝；持久的脱落花的花梗，从佛焰苞外露，硬；外部花被片不具脊。

Inflorescences in axillary pairs or solitary, cymes, panicles or spikes, unisexual; male inflorescence often long, flowers clustered on rachis of spikes, dichotomous cymes, or panicles; female glomerules lax or dense on rachis of scorpioid cymes, spikes, or panicles.

花序在腋生成对或单生，聚伞花序，圆锥花序或穗状花序，单性（植株雌雄同株或异株；雄花序通常长，在穗状花序，二歧的聚伞花序，或圆锥花序的轴上的花簇生；雌性团伞花序在蝎尾状聚伞花序、穗状花序或圆锥花序的轴上疏松或紧密。

Branches dichotomous or verticillate; stem internodes terete.

分枝二歧的或轮生；茎节间圆柱状。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。