Podophyllum peltatum (mayapple) Berberidaceae 062 -- 6 6 12/18 1

Podostemum ceratophyllum (thread foot) Podostemaceae 289 -- in rapidly flowing water

Pogonia ophioglossoides (rose pogonia) Orchidaceae (2+1z 3 1-2 3) 823 -- rose-pink fl w yellow-bearded lip; AE one mid-stem leaf Polemoniaceae (phlox) -- Gilia (standing cypress), Phlox, Polemonium (Jacob's ladder)

Polemonium reptans (spreading jacob's ladder) Polemoniaceae ((5) (5) 5 1 hypo) 392 --

Polemonium vanbruntiae (Appalachian jacob's ladder) Polemoniaceae ((5) (5) 5 1 hypo) 392 --

Polygala brevifolia (shortleaf milkwort) 330 -- rose-purple or green-purple

Polygala cruciata (drum heads milkwort) 330 -- rose-purple or green-purple

Polygala incarnata (pink milkwort) 328 -- rose-purple

Polygala lutea (orange milkwort) 328 -- orange fls

Polygala nuttallii (Nuttall's milkwort) 329 -- rose-purple; small, linear lvs

Polygala paucifolia (fringed polygala) 327 -- rose purple to white fls; AE egg-clustered at stem top

Polygala polygama (bitter milkwort) 329 -- rose-purple to white; sev stems from same root

Polygala ramosa (low pine barren milkwort) 328 -- yellow fls

Polygala sanguinea (purple or blood milkwort) 329 -- rose-purple, white, or greenish

Polygala senega (seneca milkwort) 328 -- white; sev stems from same root

Polygala sp. (milkwort) Polygalaceae --

Polygala verticillata (whorled milkwort) 329 -- white, greenish or occ. pinkish; lower lvs OE/WE

Polygonaceae -- Fagopyrum (buckwheat); Polygonella (joint weed); Polygonum (knotweed); Rumex (dock) Polygonatum biflorum (true Solomon's seal) Liliaceae (3 3 6 3) 801 -- lvs smooth beneath w 7-19 prominent nerves below

Polygonatum pubescens (hairy Solomon's seal) Liliaceae (3 3 6 3) 801 -- lvs hairy beneath w 3-9 prominent nverves below

Polygonella articulata (sand jointweed) Polygonaceae (0 5 8 3 perf/unisex) 115 --

Polygonum amphibium var. stipulaceum (water smartweed) 119

Polygonum arenastrum (dooryard knotweed) 117

Polygonum arifolium (halberd-leaved tearthumb) 123

Polygonum aviculare (knotweed) 117 -- green w white or pink margins; definite rhizome

Polygonum cespitosum (cespitose knotweed) 121 -- long bristles

Polygonum cilinode (fringed bindweed) 124 -- white in racemes; fringed sheaths; fr not winged; rocky woods

Polygonum convolvulus (black bindweed) 123 -- inconsp green fls; calyx & fr not winged

Polygonum cuspidatum (Japanese knotweed) 124

Polygonum erectum (smartweed) 116 -- pink; lvs narrowly oblong, whitish; prostrate

Polygonum glaucum (seaside knotweed) 116

Polygonum hydropiper (mild water pepper knotweed) 120 -- 4 teps; grn; spks droop at tip; stem often reddish

Polygonum hydropiperoides (false water pepper knotweed) 119 -- fls white, greenish or pinkish;

Polygonum lapathifolium (nodding smartweed) 120 -- 4 tepals; nodding spike

Polygonum neglectum 117

Polygonum pensylvanicum (Pennsylvania smartweed) 120 -- fls pink; fl stalks hairy

Polygonum perfoliatum (mile a minute) 123

Polygonum persicaria (lady's thumb smartweed) 121

Polygonum prolificum (knotweed) 118

Polygonum punctatum (dotted smartweed) 120 -- fls greenish; infl much interrupted

Polygonum ramosissimum (knotweed) 118

Polygonum robustius (coarse smartweed) 119 -- fls white; infl not much interrupted; fringed ocreae

Polygonum sagittatum (arrow-leaved tearthumb) 122

Polygonum scandens (climbing bindweed) 124 -- sheaths not fringed; calyx & fr winged

Polygonum sp. (knotweed) Polygonaceae (0 5 3-8 2-3 perf/unisex) --

Polygonum tenue (slender knotweed) 116

Polygonum virginianum (Virginia knotweed) 123 -- Polymnia canadensis (pale-flowered leaf cup) Asteraceae/Heliantheae 511 --

Polymnia uvedalia (yellow-flowered leaf cup) Asteraceae/Heliantheae 511 --

Polypodium appalachianum (Appalachian rockcap fern) Polypodiaceae 012 -- widest at pinnae base

Polypodium sp. (rockcap fern) Polypodiaceae 012 -- once-cut; alt/opp

Polypodium virginianum (Virginia rockcap fern) Polypodiaceae 012 -- narrow at pinnae base

Polypogon monspeliensis (rabbit foot grass) Poaceae 719 --

Polystichum acrostichoides (Christmas fern) Aspleniaceae 028

Pontederia cordata (pickerelweed) Pontederiaceae (6 t 5 3) 779 --

Pontederiaceae (water hyacinth) -- Heteranthera (mud plantain), Pontederia (pickerel weed), Zosterella (water stargrass)

Populus alba (white poplar) Salicaceae 152 --lf stalk terete; AT shallow lobes, tomentose under

Populus balsamifera (balsam poplar) Salicaceae -- lf stalk terete; AT egg, ptd, resinous

Populus deltoides (cottonwood) Salicaceae 153 -- lf stalk flattened laterrally; glands at base of lf stalk; lf base somewhat heart-shaped

Populus grandidentata (big tooth aspen) Salicaceae 152 -- lf stalk flattened laterrally; lf pale & glaucous beneath, very broad at base

Populus heterophylla (swamp cottonwood) Salicaceae -- lf stalk terete; glabrous exc for larger veins; shaggy, dull brown bark

Populus nigra (black poplar) Salicaceae -- lvs pubescent when young; dark, furrowed bark

Populus tremuloides (quaking aspen) Salicaceae 152 -- lf stalk flattened laterrally; round lvs, lt green, sl glaucous beneath

37