Populus x jackii (balm of gilead) Salicaceae 153 -- lf stalk terete; lvs drk green, waxy; flat or somewhat heart-shaped at base
Porteranthus trifoliatus (mountain Indian physic) Rosaceae (5 5 10+ 5) --
Portulacaceae (purslane) -- Claytonia (spring beauty); Portulaca (purslane)
Portulaca grandiflora (moss rose) Portulacaceae (4-6 2 6-10 3+) 099 fls large; lvs AE, sessile, short
Portulaca oleracea (common purslane) Portulacaceae (4-6 2 6-10 3+) 098 -- lvs OE, succulent, sessile, flat-tipped
Potamogeton amplifolius (bigleaf pond weed) 612
Potamogeton confervoides (alga pond weed) 610
Potamogeton crispus (curly pond weed) 609
Potamogeton diversifolius (common snailseed pond weed) 609 -- lvs clear, crisped edges
Potamogeton epihydrus (ribbonleaf pond weed) 611
Potamogeton foliosus (leafy pond weed) 611
Potamogeton friesii (Frie's pond weed) 610 -- chiefly calcareous
Potamogeton gramineus (variable pond weed) 612
Potamogeton illinoensis (Illinois pond weed) 613
Potamogeton natans (floating pond weed) 613
Potamogeton nodosus (longleaf pond weed) 612
Potamogeton oakesianus (Oake's pond weed) 613
Potamogeton obtusifolius (blunt-leaf pond weed) 611
Potamogeton ogdenii (Ogden's pond weed) 610
Potamogeton pectinatus (sago pond weed) 609 -- lvs many, linear, grass-like
Potamogeton perfoliatus (perfoliate pond weed) 613 --lvs clear & apple-green
Potamogeton praelongus (whitestem pond weed) 613
Potamogeton pulcher (spotted pond weed) 612
Potamogeton pusillus (slender pond weed) 611
Potamogeton richardsonii (Richardson's pond weed) 613 -- lvs almost clasping, long tear-drop shape
Potamogeton robbinsii (fern pond weed) 609
Potamogeton sp. (pond weed) Potamogetonaceae (0 4 4 4 us anemophilous)
Potamogeton spirillus (northern snailseed pond weed) 608
Potamogeton strictifolius (straight leaved pond weed) 610
Potamogeton vaginatus (big sheath pond weed) 609
Potamogeton vaseyi (Vasey's pond weed) 611
Potamogeton zosteriformis (flatstem pond weed) Potamogetonaceae (04 4 4) 610 -- lvs very linear
Potentilla anserina (silverweed cinquefoil) 225 -- prostrate; lflts silvery beneath
Potentilla argentea (silvery cinquefoil) 223 -- lflts silvery below
Potentilla arguta (tall cinquefoil) 226 -- flowers white; 7-11 egg-shaped lflts; dry fields & rocky slopes
Potentilla canadensis (dwarf cinquefoil) 222 -- the 5 lflts toothed only above the middle
Potentilla flabelliformis 224 --
Potentilla fruticosa (shrubby cinquefoil) 226 -- shrub; fls yellow, 3/4" wide; lflts silky-hairy; bogs, pastures & rocky pls.
Potentilla norvegica (rough cinquefoil) 223 -- 3 lflts; hairy, stout stem
Potentilla palustris (marsh cinquefoil) 226 -- red-purple fls; swamps & bogs; lflts 5-7, blunt-tipped
Potentilla recta (rough-fruited cinquefoil) 223 -- 7 lflts, lance-shaped, coarsely toothed
Potentilla reptans (creeping cinquefoil) 222 -- yellow; stems creeping; waste pls.
Potentilla rivalis (brook cinquefoil) 223 -- pale yellow; western occ adventive
Potentilla simplex (common cinquefoil) 222 -- 5 lflts toothed for 3/4s of their length
Potentilla sp. (cinquefoil) Rosaceae (5 5 5-N 1) --
Potentilla tridentata (three-toothed cinquefoil) 225 -- white fls; lflt ends w/ 2 notches
Prenanthes alba (white lettuce) 587 -- invol glabrous; fls creamy white; stem us. purplish w/ a whitish bloom; lvs w/ whitish bloom
Prenanthes altissima (tall white lettuce) 588 -- invol glabrous; fls greenish-white; lvs very variable; basal lvs triangular, etc.
Prenanthes autumnalis (slender rattlesnake root) 587 -- invol glabrous; pink or pale lavender; sandy, coastal
Prenanthes racemosa Asteraceae/Lactuceae 586 -- invol. pubescent; infl cylindric; pink or purplish; steambanks, moist meadows
Prenanthes serpentaria (lion's foot rattlesnake root) 587 -- invol pubescent; fls creamy white
Prenanthes sp. (rattlesnake root) Asteraceae/Lactuceae -- AT
Prenanthes trifoliolata (tall rattlesnake root) 588 -- invol glabrous; white to yellow-white, no bloom Primulaceae (primrose) -- Anagallis, Centunculus, Glaux, Hottonia, Lysimachia, Samolus, Trientalis
Proserpinaca intermedia (intermediate mermaidweed) Haolragaceae 291 --
Proserpinaca palustris (common mermaidweed) Haloragaceae 290 --
Proserpinaca pectinata (coastal plain mermaidweed) Haloragaceae 290 -- lvs smaller, more numerous
Prunella laciniata (Eurasian self-heal) Lamiaceae ((5) (5) 2+2 1) 423 --
Prunella vulgaris (self-heal) Lamiaceae ((5) (5) 2+2 1) 423 -- violet or purplish coming out from prominent term bracts; OT lance/egg
Prunus alleghaniensis (Allegheny plum) 242
Prunus americana (wild plum) 243 -- egg-shaped lvs, long-pointed; branches often thorny
Prunus angustifolia (chickasaw plum) 242 --
Prunus armeniaca (apricot) 240 -- white or sl pinkish; AT oval fls & fr sessile or nearly
Prunus avium (sweet cherry) 241-- lvs persistently long-hairy beneath, ovate-oblong to obovate; fl clusters bracted
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