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Plants of Arnold Arboretum of Harvard University

The plants most often spotted in Arnold Arboretum, ranked by recent research-grade observations.

6,531
recent observations
50
species listed
50
plants

Naturalists have logged 6,531 research-grade observations across the 50 most-recorded species in Arnold Arboretum. The most frequently seen is the Garlic Mustard, with 392 recorded sightings.

Most-observed plants in Arnold Arboretum

Garlic Mustard
Alliaria petiolata
392 observations
Lesser Celandine
Ficaria verna
335 observations · iNaturalist
Japanese Knotweed
Reynoutria japonica
273 observations
American Pokeweed
Phytolacca americana
239 observations
Ground-ivy
Glechoma hederacea
226 observations · iNaturalist
Eastern Skunk Cabbage
Symplocarpus foetidus
219 observations
Greater Celandine
Chelidonium majus
189 observations · iNaturalist
Bittersweet Nightshade
Solanum dulcamara
185 observations
Common Tansy
Tanacetum vulgare
183 observations
Common Milkweed
Asclepias syriaca
175 observations
Chicory
Cichorium intybus
169 observations
Eastern Poison Ivy
Toxicodendron radicans
154 observations
Black Swallow-wort
Vincetoxicum nigrum
148 observations · iNaturalist
Sensitive Fern
Onoclea sensibilis
145 observations
Common Jewelweed
Impatiens capensis
134 observations
Wild Carrot
Daucus carota
131 observations
Red Deadnettle
Lamium purpureum
130 observations · iNaturalist
Ribwort Plantain
Plantago lanceolata
129 observations
Tree-of-heaven
Ailanthus altissima
129 observations
American Wintergreen
Pyrola americana
129 observations · iNaturalist
Canada Mayflower
Maianthemum canadense
129 observations
Common Mugwort
Artemisia vulgaris
126 observations · iNaturalist
Common Dandelion
Taraxacum officinale
124 observations
Red Clover
Trifolium pratense
123 observations
Staghorn Sumac
Rhus typhina
123 observations
Solomon's Plume
Maianthemum racemosum
122 observations
Porcelain Berry
Ampelopsis glandulosa
122 observations · iNaturalist
White Snakeroot
Ageratina altissima
115 observations
Great Mullein
Verbascum thapsus
106 observations
Asian Bittersweet
Celastrus orbiculatus
106 observations
White Clover
Trifolium repens
103 observations
Eastern White Pine
Pinus strobus
101 observations
Castor-Aralia
Kalopanax septemlobus
97 observations · iNaturalist
Low Smartweed
Persicaria longiseta
91 observations · iNaturalist
Bull Thistle
Cirsium vulgare
86 observations
Alder Buckthorn
Frangula alnus
84 observations · iNaturalist
Multiflora Rose
Rosa multiflora
82 observations
Purple Loosestrife
Lythrum salicaria
81 observations
Siberian Squill
Scilla siberica
80 observations · iNaturalist
European Lily Of The Valley
Convallaria majalis
75 observations
Mock Strawberry
Potentilla indica
74 observations · iNaturalist
Common Toadflax
Linaria vulgaris
71 observations
Large White Trillium
Trillium grandiflorum
68 observations
Common Yarrow
Achillea millefolium
67 observations
Norway Maple
Acer platanoides
65 observations · iNaturalist
Ghost Pipe
Monotropa uniflora
64 observations
Lesser Periwinkle
Vinca minor
64 observations · iNaturalist
Eastern Hemlock
Tsuga canadensis
59 observations
Virginia Creeper
Parthenocissus quinquefolia
55 observations
Black Cherry
Prunus serotina
54 observations

Built from recent research-grade iNaturalist observations. Identifications are community-sourced and may occasionally be wrong, and the ranking reflects where people record and photograph wildlife, so a species seen often here is not necessarily rare elsewhere. Some plants and animals are only out in certain seasons. Treat this as a lively snapshot of what people are finding, not a formal checklist.

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