(265)__Potamogeton pulcher, commonly known as spotted pondweed;

(266)__Potamogeton strictifolius, commonly known as straight-leaved pondweed;

(267)__Potomogeton vaseyi, commonly known as Vasey's pondweed;

(268)__Prenanthes boottii, commonly known as Boott's rattlesnake root;

(269)__Prenanthes x mainensis, commonly known as Maine rattlesnake root;

(270)__Prenanthes nana, commonly known as dwarf rattlesnake root;

(271)__Prenanthes racemosa, commonly known as glaucous rattlesnake root;

(272)__Primula laurentiana, commonly known as bird's- eye primrose;

(273)__Primula mistassinica, commonly known as Mistassini primrose;

(274)__Proserpinaca pectinata, commonly known as comb-leaved mermaid-weed;

(275)__Prunus maritima, commonly known as beach plum;

(276)__Pseudognaphalium helleri, commonly known as small rabbit tobacco;

(277)__Pycnanthemum muticum, commonly known as blunt mountain-mint;

(278)__Pyrola asarifolia, commonly known as pink wintergreen;

(279)__Pyrola minor, commonly known as lesser wintergreen;

(280)__Quercus bicolor, commonly known as swamp white oak;