Table 2 A comparison of morphological characters between Jianchangia and other gnetalean macrofossils from northeastern China
Taxon | Female cone present | Chlamydosperms pedicled | Chlamydosperms in a cone | Chlamydosperms sculptured | Literature |
|---|---|---|---|---|---|
Alloephedra | yes, compact | no | 2 | no | Tao & Yang 2003 [48] |
Beipiaoa | yes, compact | no | 2 | no | Sun & al. 2001 [47] |
Chengia | yes, but laxly arranged into spikes | no | Many in multiple whorls | no | Yang & al. 2013 [16] |
Constrobilus | yes, compact | no | 2 | no | Liu & al. 2013 [43] |
Ephedra archaeorhytidosperma | yes, compact | no | 1-2 | transversely wrinkled | Yang & al. 2005 [51] |
E. carnosa | yes, compact | no | 1-3 | no | Yang & Wang 2013 [54] |
E. hongtaoi | yes, compact | no | 2 | no | Wang & Zheng |
E. multinervia | yes, compact | no | 2 | no | Yang & al. 2015 [52] |
Gurvanella | yes, compact | no | usually 3 | no | Sun & al. 2001 [47] |
Jianchangia | yes, compact | no | 2 | no | This study |
Latibractea | yes, compact | no | - | - | Liu & al. 2013 [43] |
Liaoxia cheniae | yes, compact | no | many | no | |
Prognetella | no, in reproductive shoots | no | paired at nodes of reproductive shoots | no | Yang & Ferguson 2015 [15] |
Protognetum jurassicum | laxly arranged spikes | no | 4-6 whorled at nodes of a reproductive shoot | no | |
Pseudoephedra | no | yes | not organized into a cone | no | Liu & Wang 2016 [44] |
Siphonospermum simplex | no | yes | pedicled | no | Rydin & Friis 2010 [45] |
Spinobractea | yes, more or less in lax spikes | no | 1-2 | no | Liu & al. 2013 [43] |