Picea sp. (spruce) Pinaceae 031 --

Picris echioides (bristly ox-tongue) Asteraceae/Lactuceae 600 --

Picris hieracioides (hawkweed ox-tongue) Asteraceae/Lactuceae 600 --

Pieris floribunda (andromeda) Ericaceae ((5) 5 10 1) 189 --

Pilea fontana (clearweed) Urticaceae (0 4 4 0/0 3 0 1) 72 -- purple achene

Pilea pumila (clearweed) Urticaceae (0 4 4 0/0 3 0 1) 71 -- green achene

Pimpinella saxifraga (burnet saxifrage) Apiaceae (5 5 5 2) 353 --

Pinaceae (pine) -- Abies (fir) Larix (larch) Picea (spruce) Pinus (pine) Tsuga (hemlock)

Pinellia ternata Lemnaceae (0 0 1 0/0 0 0 1) 616 -- Pinus banksiana (jack pine) 033 -- 2 needles us. curved; cones +or- erect, us. curved; yellowish-brown; dry soil

Pinus echinata (shortleaf pine) 034 -- 2 or 3 needles

Pinus nigra (Austrian pine) -- fascicles of 2, 6.5" long; stiff, dark green; cones ovoid to 3.5" long

Pinus resinosa (red pine) 032 -- 2 needles; dk green, snapping cleanly when bent 9-16cm; bark light red brown, scaly plates

Pinus rigida (pitch pine) 034 -- 3 needles; trunk often w/ outbreaks of needle clumps

Pinus sp. (pine) Pinaceae

Pinus strobus (white pine) 032 -- 5 needles

Pinus sylvestris (scotch pine) 032 -- 2 needles to 3", twisted, glaucous, bluish-green; orange bark toward top; cones to 2.5"

Pinus thunbergii (Japanese black pine) -- 2 needles, thick, ptd, sl twisted; numerous cones to 2.5" w/ small spine

Pinus virginiana (scrub pine) 034-- 2 needles to 3", stiff, twisted' cones to 2.5" Piptochaetium avenaceum Poaceae 694 --

Pistia stratiotes (water lettuce) -- Plantago aristata (bracted plantain) 434 -- nrrw, dk grn lvs; spike 1-6" w/ stiff protruding bracts

Plantago cordata (king-root plantain) 432 --

Plantago coronopus (plantain) 434 --

Plantago heterophylla (diverse-leaved plantain) 433 --

Plantago lanceolata (English plantain) 433 -- lanceolate lvs

Plantago major (common plantain) 432 -- egg-shaped lvs, prominently ribbed

Plantago maritima (salt marsh plantain) 432 -- narrow, 1-ribbed, fleshy lvs; spike1-5" long

Plantago media (intermediate plantain) 432 --

Plantago patagonica (plantain) 434 --

Plantago psyllium (leafy-stemmed plantain) 431 -- linear lvs

Plantago pusilla (little plantain) 433 --

Plantago rhodosperma (red-seeded plantain) 433 --

Plantago rugelii (American plantain) 432 -- egg-shaped, lf stalks red at base

Plantago sp. (plantain) Plantaginaceae ((4) (4) 4 1 superior) --

Plantago virginica (Virginia plantain) 433 -- Platanaceae (plane-tree) -- Platanus (sycamore)

Platanus occidentalis (sycamore) Platanaceae 068

Platanus x hybrida (London plane) Platanaceae 068 -- 2-4 heads per infl.

Pluchea odorata (marsh fleabane) Asteraceae/Inuleae 564 -- AT heads pink-purple; salt/brackish marshes

Plumbaginaceeae (leadwort) -- Limonium (sea lavender)

Poa alsodes (wood bluegrass) Poaceae 702 -- tufted; lemmas webbed at base

Poa annua (annual bluegrass) Poaceae 703 -- annual

Poa autumnalis (autumnal bluegrass) Poaceae 705 -- tufted; lemmas not webbed at base; infl broad & open; moist woods

Poa bulbosa (bulbous bluegrass) Poaceae 702 -- tufted; bulbous at base; unruly infl w bulblets; lemmas pubescent; fields & streams

Poa chaixii (tall bluegrass) Poaceae 704 -- tufted; lemmas not webbed at base; slender infl

Poa compressa (Canada bluegrass) 701 Poaceae -- creeping rhizomes; flat stem

Poa cuspidata (cuspidate bluegrass) Poaceae 701 -- creeping rhizomes; lower sheaths hairy; fascicles of 2 or 3 or solitary

Poa fernaldiana (Fernald's bluegrass) Poaceae 704 -- tufted; lemmas webbed or not at base; broad & open infl

Poa languida (languid bluegrass) Poaceae 702 -- tufted; lemmas webbed at base

Poa nemoralis (woodland bluegrass) Poaceae 704 -- tufted; lemmas webbed at base

Poa paludigena (marsh bluegrass) Poaceae 703 -- tufted; lemmas webbed at base; bogs & wet woods

Poa palustris (fowl meadow bluegrass) Poaceae 704 - tufted; lemmas webbed at base; purplish, often decumbent base

Poa pratensis (Kentucky blue grass) Poaceae 701 --creeping rhizomes; fascicles 4ormore;cobwebby hairs at seedbase; sheaths us glbrs; lng petioled

Poa saltuensis (bushy pasture blue grass) Poaceae 702 -- tufted; lemmas webbed at base

Poa sp. -- 2-sev fld in panicles

Poa sylvestris (forest bluegrass) Poaceae 703 -- tufted; lemmas webbed at base

Poa trivialis (rough-stalked bluegrass) Poaceae 702 -- tufted; lemmas webbed at base, glabrous; decumbent base; notched ligule; moist pls.

Poaceae I (tall, stout grasses) -- Andropogon, Erianthus, Miscanthus, Phragmites, Sorghastrum, Sorghum, Tripsacum, Zizannia,

Poaceae II (floret one; spikes or rames) -- Bouteloua, Chloris, Cynodon, Hordeum

Poaceae II (floret one; panicle) -- Agrostis, Aristida, Brachyelytrum, Milium, Phalaris, Setaria

Poaceae III (floret 2+; panicle) -- Avena, Deschampsia, Triplasis, Tridens, Trisetum

Poaceae IV (floret 2+; spikes or racemes) -- Buchloe, Chloris, Eleusine, Elymus, Hordeum, Leptochloa,

Poaceae V (disarticulate below glumes) -- Holcus, Panicum, Schizachyrium

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