| County | FullName | Family | Status | Source |
|---|---|---|---|---|
| Westmorland | Amaranthus albus L. | Amaranthaceae | S3 | UNB |
| Westmorland | Amelanchier canadensis (L.) Medik. | Rosaceae | S3 | UNB |
| Westmorland | Amelanchier lucida Fern. | Rosaceae | S2 | UNB |
| Westmorland | Arabis hirsuta (L.) Scop. var. adpressipilis (Hopkins) Rollins | Brassicaceae | S2 | UNB |
| Westmorland | Arethusa bulbosa L. | Orchidaceae | S3 | UNB |
| Westmorland | Aster subulatus Michx. var. subulatus | Asteraceae | S1 | UNB |
| Westmorland | Atriplex franktonii Taschereau | Chenopodiaceae | S2 | UNB |
| Westmorland | Betula pumila L. | Betulaceae | S3 | UNB |
| Westmorland | Botrychium simplex E. Hitch | Ophioglossaceae | S2 | UNB |
| Westmorland | Calamagrostis pickeringii A. Gray | Poaceae | S2 | UNB |
| Westmorland | Calamagrostis stricta (Timm) Koel. ssp. inexpansa (Gray) C.W. Greene | Poaceae | S1 | UNB |
| Westmorland | Calopogon tuberosus (L.) BSP. | Orchidaceae | S3S4 | UNB |
| Westmorland | Carex chordorrhiza Ehrh. ex L. f. | Cyperaceae | S2S3 | UNB |
| Westmorland | Carex comosa Boott | Cyperaceae | S1 | UNB |
| Westmorland | Carex cryptolepis Mack. | Cyperaceae | S3 | UNB |
| Westmorland | Carex diandra Schrank | Cyperaceae | S3 | UNB |
| Westmorland | Carex mackenziei Krecz. | Cyperaceae | S3 | UNB |
| Westmorland | Carex ormostachya Wieg. | Cyperaceae | S2S3 | UNB |
| Westmorland | Carex tenera Dewey | Cyperaceae | S3 | UNB |
| Westmorland | Carex wiegandii Mack. | Cyperaceae | S3 | UNB |
| Westmorland | Ceratophyllum echinatum Gray | Ceratophyllaceae | S1S2 | UNB |
| Westmorland | Cladium mariscoides (Muhl.) Torr. | Cyperaceae | S2 | UNB |
| Westmorland | Corallorhiza maculata Raf. var. occidentalis (Lindley) Ames | Orchidaceae | S2S3 | UNB |
| Westmorland | Crataegus scabrida Sarg. | Rosaceae | S2 | UNB |
| Westmorland | Cypripedium parviflorum Salisb. var. pubescens (Willd.) Knight | Orchidaceae | S3 | UNB |
| Westmorland | Cypripedium reginae Walt. | Orchidaceae | S2 | UNB |
| Westmorland | Diphasiastrum x sabinifolium (Willd.) Holub | Lycopodiaceae | S2S3 | UNB |
| Westmorland | Distichlis spicata (L.) Greene | Poaceae | S2 | UNB |
| Westmorland | Elatine americana (Pursh) Arn. | Elatinaceae | S2 | UNB |
| Westmorland | Eleocharis parvula (R. & S.) Link | Cyperaceae | S2 | UNB |
| Westmorland | Eleocharis tenuis (Willd.) Schultes | Cyperaceae | S3 | UNB |
| Westmorland | Equisetum variegatum Schleich. ex Weber & Mohr | Equisetaceae | S3 | UNB |
| Westmorland | Eragrostis pectinacea (Michx.) Nees | Poaceae | S2? | UNB |
| Westmorland | Eriophorum chamissonis C.A. Mey. | Cyperaceae | S2S3 | UNB |
| Westmorland | Galium obtusum Bigel. | Rubiaceae | S2? | UNB |
| Westmorland | Geranium bicknellii Britt. var. longipes (Wats.) Fern | Geraniaceae | S3 | UNB |
| Westmorland | Goodyera pubescens (Willd.) R. Br. | Orchidaceae | S1 | UNB |
| Westmorland | Goodyera tesselata Lodd. | Orchidaceae | S3S4 | UNB |
| Westmorland | Juncus greenei Oakes & Tuckerm. | Juncaceae | S1 | UNB |
| Westmorland | Juncus militaris Bigel. | Juncaceae | S3 | UNB |
| Westmorland | Lechea intermedia Leggett ex Britt. | Cistaceae | S3 | UNB |
| Westmorland | Lemna trisulca L. | Lemnaceae | S2 | UNB |
| Westmorland | Liparis loeselii (L.) Richard | Orchidaceae | S3 | UNB |
| Westmorland | Listera convallarioides (Sw.) Nutt | Orchidaceae | S3S4 | UNB |
| Westmorland | Listera cordata (L.) R. Br. | Orchidaceae | S3S4 | UNB |
| Westmorland | Lonicera oblongifolia (Goldie) Hook. | Caprifoliaceae | S2 | UNB |
| Westmorland | Lysimachia thyrsiflora L. | Primulaceae | S3S4 | UNB |
| Westmorland | Megalodonta beckii (Torr. ex. Spreng.) Greene | Asteraceae | S3 | UNB |
| Westmorland | Myriophyllum farwellii Morong | Haloragaceae | S2 | UNB |
| Westmorland | Myriophyllum verticillatum L. | Haloragaceae | S2 | UNB |
| Westmorland | Oryzopsis canadensis (Poir.) Torr. | Poaceae | S2 | UNB |
| Westmorland | Panex trifolius L. | Araliaceae | S2 | UNB |
| Westmorland | Platanthera blephariglottis (Willd.) Lindl. | Orchidaceae | S3 | UNB |
| Westmorland | Polygala paucifolia Willd. | Polygalaceae | S2 | UNB |
| Westmorland | Polygala sanguinea L. | Polygalaceae | S2 | UNB |
| Westmorland | Polygonum neglectum Besser | Polygonaceae | S1? | UNB |
| Westmorland | Potamogeton obtusifolius Mert. & Koch | Potamogetonaceae | S2S3 | UNB |
| Westmorland | Puccinellia nutkaensis (J. Presl.) Fern. & Weath. | Poaceae | S2 | UNB |
| Westmorland | Puccinellia phryganodes (Trin.) Schribner & Merr. | Poaceae | S2 | UNB |
| Westmorland | Pyrola americana Sweet | Pyrolaceae | S3S4 | UNB |
| Westmorland | Ranunculus gmelinii DC. | Ranunculaceae | S2 | UNB |
| Westmorland | Rumex maritimus L. | Polygonaceae | S2S3 | UNB |
| Westmorland | Scirpus pendulus Muhl. | Cyperaceae | S1 | UNB |
| Westmorland | Sparganium natans L. | Sparganiaceae | S2S3 | UNB |
| Westmorland | Symplocarpus foetidus (L.) Salisb. ex Barton | Araceae | S2 | UNB |
| Westmorland | Teucrium canadense L. | Lamiaceae | S2 | UNB |
| Westmorland | Toxicodendron radicans (L.) Kuntze | Anacardiaceae | S2? | UNB |
| Westmorland | Utricularia geminiscapa Benj. | Lentibulariaceae | S2 | UNB |
| Westmorland | Veronica peregrina L. ssp. xalapensis (Kunth) Pennell | Scrophulariaceae | S2? | UNB |
| Westmorland | Waldsteinia fragarioides (Michx.) Tratt. | Rosaceae | S1 | UNB |
| Westmorland | Xyris montana Ries. | Xyridaceae | S3 | UNB |
| Westmorland | Zizania palustris L. var. palustris | Poaceae | S3 | UNB |