Cordaites
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The middle and upper layers may be composed of Lepidodendron , Cordaites, Calamites and some tree ferns or seed ferns.
群落的中、高层通常是石松纲和科达纲，楔叶纲中Calamites及某些树蕨和种子蕨。
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Chiefly Paleozoic plants; Cordaites is the chief and typical genus.
古代植物的主要科；柯达属是一个主要的模式属。
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Reduction of ovule number as a tendency of speciation in the genus is substantiated by the occurrence of tri_ovulate cones coupled with comprehensive characters of the genus. The metamorphic patterns as well as the leaf nature of the outer envelope indicate that female cones of Ephedra are compound while the female reproductive units of the ovulate cone have been reduced from secondary reproductive shoots similar to those of cordaites by phylogenetic transformation, fusion and reduction. Each fertile bract together with its axillary female reproductive unit composed the Bract Scale and Seed Scale Complex of Ephedra .
基于返祖性畸形三胚珠球花的出现及其他形态特征，认为麻黄属胚珠数目减少是该属内物种特化的一个趋势；利用雌球花发育的畸形现象及外珠被的形态学本质提出麻黄属的雌球果为复轴性构造，雌性生殖单位是由类似于科达类的次级生殖枝构造经系统发育变态、融合、简化成现存的生胚珠构造式样，每一可育苞片及其腋内雌性生殖单位共同组成了麻黄属的苞鳞_种鳞复合体。
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Cordaites：科达
长的可达1米,边缘一般为全缘,螺旋状排列于枝上,叶脉密,平行伸展,多在基部分叉,脉间常见密集细纹. 晚泥盆世至三叠纪,晚石炭世至二叠纪极繁盛,密生成林,是当时重要造煤植物之一. 常见化石有科达(Cordaites)、匙叶(Noeggerathiopsis)等
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Cordaites：高达木
"coral reef","珊瑚礁" | "cordaites","高达木" | "coaduroy","浪形毡 ; 棉毛毡"
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Cordaites Unger：科达属
山东侧羽叶(新种)P.shandongense sp.nov. | 科达纲Cordaitopsida | 科达属Cordaites Unger,1850