156 BOTANICAL NAMES 



" atrum " (black); from the dark colour of the 

 leaves. Second hot. name. 



Onagraceae (on-a-jra-si-e). L. " Onager " (a wild 

 ass); " aceous " (like). Bot. name CEnothera 

 family. 



Onion. From L. " unio " (a kind of single onion). 



Onobrychis (on-o-bre-kis). G. " Onos " (an ass); 

 ' ' bruchon ' ' (to bray) ; because an ass always brays 

 for it. Bot. name Sanfoin group. 



Ononis (on-o-nis). G. " Onos " (an ass); because he 

 likes the plant. Bot. name for a group. 



Onopordon (on-o-por-don). G. name for some kind of 

 thistle. Bot. name of a group. 



Opaca (o-pa-ka). L. adj., " in the shade." A second 

 bot. name. 



Ophioglossum (of-e-o-glos-sum). G. " Ophios " (a 

 snake); " glossum " (a tongue); from the shape 

 of the frond. Bot. name Adder's Tongue group. 



Ophioglossifolius (of-e-o-glos-si-fol-ius). G. " Ophio- 

 glossum " and " folius " (a leaf); i.e., snake- 

 tongue-leaved. Second bot. name. 



Ophrys (of-ris). G. "for the eye-brow"; because G. 

 ladies used the plant to darken their eyebrows. 

 Bot. name for group. 



Opium (o-pe-um). G. " Opion " (the juice of the 

 poppy). 



Oppositifolium (op-pos-it-i-fol-ium). L. " Oppositus " 

 (opposite); "folius" (leaf); i.e., leaves are oppo- 

 site to one another. Second bot. name. 



Opulus (op-u-lus). L. name for some tree ; now used as 

 second bot. name for the Guelder rose. 



Orache (or-atsh). French word for " mountain 

 spinach." Now used as Eng. name for Atriplex 

 group. 



