| 单词 | Pityrogramma argentea |
| 释义 | Pityrogramma argentea (extremely rare) n WORD FAMILY Pityrogramma argentea n fern of southern tropical Africa having fronds with white undersides Syn|Hyper silver fern fern any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores |
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