501. Knotted Rush
Juncus nodosus
502. Mountain Holly
Ilex mucronata
503. Summer Grape
Vitis aestivalis
504. Northern Bugleweed
Lycopus uniflorus
505. Bristly Buttercup
Ranunculus hispidus
506. Early Buttercup
Ranunculus fascicularis
507. Yellow Lady’s Slipper
Cypripedium parviflorum
508. Showy Lady’s Slipper
Cypripedium reginae
509. Wheat Sedge
Carex atherodes
510. Knotsheath Sedge
Carex retrorsa
511. Fibrousroot Sedge
Carex communis
512. Arctic Brome
Bromus kalmii
513. Dewey’s Sedge
Carex deweyana
514. Rocky Mountain Fescue
Festuca saximontana
515. White Rattlesnakeroot
Nabalus albus
516. Frost Grape
Vitis vulpina
517. Annual Fleabane
Erigeron annuus
518. Northern Redcurrant
Ribes triste
519. Eastern Prickly Gooseberry
Ribes cynosbati
520. American Vetch
Vicia americana
521. Waxflower Shinleaf
Pyrola elliptica
522. Rattlesnake Fern
Botrypus virginianus
523. Cinnamon Fern
Osmunda cinnamomea
524. Threeleaf Goldthread
Coptis trifolia
525. Tuckerman’s Sedge
Carex tuckermanii
526. Smooth Sawgrass
Cladium mariscoides
527. Common Groundcherry
Physalis longifolia
528. Clammy Groundcherry
Physalis heterophylla
529. Blackseed Plantain
Plantago rugelii
530. Ontario Aster
Symphyotrichum ontarionis
531. Dwarf Red Blackberry
Rubus pubescens
532. Beggarslice
Hackelia virginiana
533. Fragrant Bedstraw
Galium triflorum
534. Thinleaf Cottonsedge
Eriophorum viridicarinatum
535. Hay Sedge
Carex argyrantha
536. Rigid Sedge
Carex tetanica
537. Grove Bluegrass
Poa alsodes
538. Eastern Marsh Fern
Thelypteris palustris subsp. pubescens
539. Whorled Milkwort
Polygala verticillata
540. Fraser’s Marsh St. Johnswort
Triadenum fraseri
541. Matted Spikerush
Eleocharis intermedia
542. Coontail
Ceratophyllum demersum
543. Philadelphia Fleabane
Erigeron philadelphicus
544. Water Knotweed
Persicaria amphibia
545. Bastard Toadflax
Comandra umbellata
546. Fringed Brome
Bromus ciliatus
547. Bristly-Stalked Sedge
Carex leptalea
548. Broad-Glumed Wheatgrass
Elymus violaceus
549. Southern Lady Fern
Athyrium asplenioides
550. Marsh Speedwell
Veronica scutellata
551. Orangefruit Horse-Gentian
Triosteum aurantiacum
552. Eastern Poison Ivy
Toxicodendron radicans
553. Toad Rush
Juncus bufonius
554. Horseweed
Erigeron canadensis
555. Canada Lettuce
Lactuca canadensis
556. Littleleaf Buttercup
Ranunculus abortivus
557. Canada Nettle
Laportea canadensis
558. Maryland Sanicle
Sanicula marilandica
559. American Lopseed
Phryma leptostachya
560. Hayden’s Sedge
Carex haydenii
561. Broad-Leaved Helleborine
Epipactis helleborine
562. Swamp Dock
Rumex verticillatus
563. Schweinitz’s Flatsedge
Cyperus schweinitzii
564. Greater Water Dock
Rumex britannica
565. False Melic
Schizachne purpurascens
566. American Cancer-Root
Conopholis americana
567. Rock Harlequin
Capnoides sempervirens
568. Indian Pipe
Monotropa uniflora
569. Arrowleaf Tearthumb
Persicaria sagittata
570. Marsh Bellflower
Campanula aparinoides
571. Prairie Cordgrass
Sporobolus michauxianus
572. Prairie Sandreed
Sporobolus rigidus
573. False Mermaidweed
Floerkea proserpinacoides
574. Interrupted Club-Moss
Spinulum annotinum
575. Cleland’s Evening Primrose
Oenothera clelandii
576. American Searocket
Cakile edentula
577. Smooth Rockcress
Borodinia laevigata
578. Hoary Frostweed
Crocanthemum bicknellii
579. Black-Fruited Rice Grass
Oryzopsis racemosa
580. African Tephrosia
Tephrosia subtriflora
581. Pointedleaf Ticktrefoil
Hylodesmum glutinosum
582. Downy Willowherb
Epilobium strictum
583. Low False Bindweed
Calystegia spithamaea
584. Narrowleaf Wild Leek
Allium burdickii
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