210 THE LEPIDOPTERIST'S CALENDAR 



Ononis spinosa spinous rest harrow 



,, repens sea-side rest harrow 



Origanum vulgare wild marjorum 



Ornithopus perpusillus birdsfoot 



Orobus sy 1 vaticus wood bitter vetch 



tuberosus tuberous orobus 



M niger black bitter vetch 



Oxycoccus palustris cranberry 



Papaver rhseas common red poppy 



orientale ...large garden poppy 



Pastinaca sativa parsnip 



sylvestris wild parsnip 



edulis garden parsnip 



Petasites vulgaris butter bur 



Peucedanum palustre milk parsley, or hog's fennel, or marsh 



fennel 



Phleum pratense cat's-tail, or timothy grass 



Phragmites communis common reed 



Picris hieracioides hawkweed picris 



Pimpinella magna great burnet saxifrage 



(I saxifraga common burnet saxifrage 



Pinus sylvestris Scotch fir 



strobus Weymouth fir 



balsamea Canadian balsam fir 



, r alba white fir 



Plantago major greater plantain 



, , lanceolata ribwort, or narrow-leaved plantain 



maritima sea plantain 



Platanus orientalis oriental plane tree 



, , occidentalis American plane tree 



Poa annua annual meadow grass 



aquatica reed meadow grass 



Polygala vulgaris milkwort 



Polygonum aviculare knotgrass 



, , hydropiper water pepper, or biting persicaria . 



persicaria spotted persicaria 



Polypodium filix-mas male fern 



Populus alba white poplar 



, , tremula aspen 



nigra black poplar 



fastigata Lombardy poplar 



Potamogeton pectinatus fennel-leaved pondweed 



Potentilla tormentilla ... tormentil 



reptans creeping cinquefoil 



anserina silver weed 



Poteriam sanguisorba salad burnet 



Primula vulgaris primrose 



veris cowslip 



Prunus spinosa .., sloe, or blackthorn 



domestica plum 



Pteris aquilina brake fern 



Py rethrum inodorum corn feverfew 



