ACONITUM NAPELLUS Linnaeus - Garden Monkshood. 2n = 32.

Roadsides, thickets, old house sites. From Europe.

ACONITUM UNCINATUM Linnaeus - Wild Monkshood. 2n = 16.

Waste places. From farther south.

Actaea pachypoda Elliott - White Baneberry. 2n = 16.

Rich woods.

Actaea rubra Willdenow - Red Baneberry. 2n = 16.

Rich woods.

Actaea hybrid

Actaea X ludovici B. Boivin - .

[A. pachypoda Elliott X A. rubra Willdenow]

Anemone acutiloba (de Candolle) G. Lawson - Sharp-lobed Hepatica. 2n = 14.

Rich, often calcareous, woods. [Hepatica acutiloba de Candolle; Hepatica nobilis Miller var. acuta (Pursh) Steyermark]

Anemone americana (de Candolle) H. Hara - Round-lobed Hepatica. 2n = 14.

Rich, dry, open woods. [Hepatica americana (de Candolle) Ker Gawler; Hepatica nobilis Miller var. obtusa (Pursh) Steyermark]

ANEMONE BLANDA Schott & Kotschy - Grecian Windflower. 2n = 14, 16.

Disturbed woods. From Europe.

Anemone canadensis Linnaeus - Canada Anemone. 2n = 14.

Damp thickets, woodland margins, meadows, riverbanks, shores.

Anemone cylindrica A. Gray - Long-headed Anemone. 2n = 16.

Dry, open soil, roadsides.

Anemone multifida Poiret var. multifida - Cut-leaved Anemone. 2n = 32.

Calcareous ledges.

ANEMONE NEMOROSA Linnaeus - European Wood Anemone. 2n = 16, 30, 46.

Woods. From Europe.

Anemone quinquefolia Linnaeus var. quinquefolia - Wood Anemone. 2n = 32.

Open, moist woods, woodland borders. [A. quinquefolia var. bifolia Farwell; A. quinquefolia var. interior misapplied]

Anemone virginiana Linnaeus var. virginiana - Tall Anemone. 2n = 16.

Dry, rocky, open woods, thickets, riverbanks.

Anemone virginiana Linnaeus var. alba (Oakes) A.W. Wood - River Thimbleweed. 2n = 16.

Riverbanks, shores. [A. riparia Fernald]

Anemone hybrid

Anemone cylindrica A. Gray X Anemone virginiana Linnaeus var. virginiana - .

Aquilegia canadensis Linnaeus - Wild Columbine. 2n = 14.

Rock outcrops in woods, cliffs, rich soil. [A. canadensis var. coccinea (Small) Munz]

AQUILEGIA VULGARIS Linnaeus - Garden Columbine. 2n = 14.

Roadsides, woodland borders, disturbed areas. From Europe.

Caltha palustris Linnaeus - Marsh Marigold. 2n = 32, 56, 60.

Swamps, wet meadows, brooksides, wet woods, marshes.

Cimicifuga racemosa (Linnaeus) Nuttall - Black Snakeroot. 2n = 16.

Rich, moist woods. [A specimen at NHA collected from Boston in 1876 without habitat information is presumed to be cultivated.]

Clematis occidentalis (Hornemann) de Candolle var. occidentalis - Purple Clematis. 2n = 16.

Rocky, often calcareous, slopes and woods. [C. verticillaris de Candolle]

CLEMATIS RECTA Linnaeus - Ground Clematis. 2n = 16.

Rock walls. From Eurasia.

CLEMATIS TERNIFLORA de Candolle - Sweet Autumn Clematis. 2n = 32, 48.

Roadsides, thickets. From eastern Asia. [C. DIOSCOREIFOLIA H. Léveillé & Vaniot; C. DIOSCOREIFOLIA H. Léveillé & Vaniot var. ROBUSTA (Carrière) Rehder]

Clematis virginiana Linnaeus - Virgin's-bower. 2n = 16.

Moist thickets, low, moist, open ground, often disturbed.

CONSOLIDA AJACIS (Linnaeus) Schur - Rocket Larkspur. 2n = 16.

Rubbish heaps, waste ground, old fields. From Europe and Africa. [Delphinium ajacis Linnaeus; Consolida ambigua misapplied]

CONSOLIDA ORIENTALIS (M. Gay) Schrödinger - Eastern Larkspur. 2n = 16.

Roadsides. From Eurasia and Africa.

Coptis trifolia (Linnaeus) Salisbury - Goldthread. 2n = 18.

Mossy woods, swamps. [C. groenlandica (Oeder) Fernald]

DELPHINIUM EXALTATUM Aiton - Tall Larkspur. 2n = ?

Roadsides. From farther south and west.

Hydrastis canadensis Linnaeus - Goldenseal. 2n = 26.

Rich woods.

MYOSURUS MINIMUS Linnaeus - Little Mousetail. 2n = 16.

Fields. From farther west and south.

NIGELLA DAMASCENA Linnaeus - Love-in-a-mist. 2n = 12, 14.

Waste ground. From Eurasia.

NIGELLA SATIVA Linnaeus - Black Cumin. 2n = 12.

Waste ground. From southwest Asia.

PULSATILLA PATENS (Linnaeus) Miller subsp. PATENS - Pasqueflower. 2n = 16.

Waste ground. From Eurasia. [ANEMONE PATENS Linnaeus subsp. PATENS]

Ranunculus abortivus Linnaeus - Kidneyleaf Crowfoot. 2n = 16.

Damp, rich woods. [R. abortivus var. acrolasius Fernald; R. abortivus var. eucyclus Fernald]

RANUNCULUS ACRIS Linnaeus - Tall Buttercup. 2n = 14.

Moist fields, meadows, roadsides. From Europe. [R. ACRIS var. LATISECTUS Beck]

Ranunculus allegheniensis Britton - Mountain Crowfoot. 2n = 16.

Damp, rocky woods in calcareous soil.

Ranunculus ambigens S. Watson - Water-plantain Spearwort. 2n = ?

Ponds, ditches, brooks.

Ranunculus aquatilis Linnaeus var. diffusus Withering - White Water Crowfoot. 2n = 16, 32, 48.

Ponds, lakes, slow streams. [R. longirostris (Godron) F.W. Schultz; R. subrigidus W. B. Drew; R. trichophyllus Chaix; R. trichophyllus Chaix var. calvescens W.B. Drew]

RANUNCULUS BULBOSUS Linnaeus - Bulbous Buttercup. 2n = 16.

Roadsides, fields, open woods. From Eurasia. [R. BULBOSUS var. DISSECTUS Babey; R. BULBOSUS var. VALDEPUBENS (Jordan) Briquet]

Ranunculus cymbalaria Pursh - Seaside Crowfoot. 2n = 16.

Salt marshes, sea beaches.

Ranunculus fascicularis Muhlenberg ex J.M. Bigelow - Early Buttercup. 2n = 32.

Open hillsides on thin soil, ledges (often calcareous).

RANUNCULUS FICARIA Linnaeus - Lesser Celandine. 2n = 16, 24, 32.

Moist, disturbed areas. From Europe. [R. FICARIA var. BULBIFERA Albert]

Ranunculus flabellaris Rafinesque - Yellow Water Buttercup. 2n = 32.

Shallow water of ponds and quiet streams, drying mud.

Ranunculus flammula Linnaeus var. ovalis (J.M. Bigelow) L.D. Benson - Creeping Spearwort. 2n = 32.

Pond and river shores. [R. reptans Linnaeus var. ovalis (J.M. Bigelow) Torrey & A. Gray]

Ranunculus flammula Linnaeus var. reptans (Linnaeus) E. Meyer - Creeping Spearwort. 2n = 32.

Pond and river shores. [R. reptans Linnaeus var. reptans]

Ranunculus gmelinii de Candolle - Small Yellow Water Buttercup. 2n = 16, 32, 64.

Muddy pools, brooks, ditches, shores. [R. gmelinii var. hookeri (D. Don) L.D. Benson]

Ranunculus hispidus Michaux var. hispidus - Hispid Buttercup. 2n = 32.

Dry, often rocky, woods. [R. hispidus var. falsus Fernald]

Ranunculus hispidus Michaux var. caricetorum (Greene) T. Duncan - Swamp Buttercup. 2n = 64.

Swampy woods, meadows. [R. septentrionalis Poiret var. caricetorum (Greene) Fernald]

Ranunculus lapponicus Linnaeus - Lapland Buttercup. 2n = 16.

Wet moss, wet woods.

Ranunculus micranthus Nuttall - Rock Buttercup. 2n = 16.

Rich, rocky woods. [R. micranthus var. delitescens (Greene) Fernald]

Ranunculus pensylvanicus Linnaeus f. - Bristly Crowfoot. 2n = 16.

Meadows, ditches, shores, thickets.

Ranunculus recurvatus Poiret var. recurvatus - Hooked Crowfoot. 2n = 32.

Rich, moist woods, brooksides.

RANUNCULUS REPENS Linnaeus - Creeping Buttercup. 2n = 14, 32.

Wet, open ground, ditches, roadsides. From Eurasia. [R. REPENS var. ERECTUS de Candolle; R. REPENS var. GLABRATUS de Candolle; R. REPENS var. LINEARILOBUS de Candolle; R. REPENS var. PLENIFLORUS Fernald; R. REPENS var. VILLOSUS Lamotte]

RANUNCULUS RHOMBOIDEUS Goldie - Prairie Buttercup. 2n = 16.

Habitat? From farther west.

RANUNCULUS SARDOUS Crantz - Hairy Buttercup. 2n = 16, 32, 48.

Fields. From Europe.

Ranunculus sceleratus Linnaeus var. sceleratus - Cursed Crowfoot. 2n = 32.

Marshes, ditches, springy places.

Thalictrum dasycarpum Fischer & Avé-Lallemant - Purple Meadow-rue. 2n = 168.

Meadows, shores, wet thickets.

Thalictrum dioicum Linnaeus - Early Meadow-rue. 2n = 14.

Rich, rocky woods.

Thalictrum pubescens Pursh - Tall Meadow-rue. 2n = 126.

Meadows and other low, wet ground, usually in the open. [T. polygamum Muhlenberg ex Sprengel; T. polygamum Muhlenberg ex Sprengel var. hebecarpum (Fernald) B. Boivin; T. polygamum Muhlenberg ex Sprengel var. intermedium B. Boivin]

Thalictrum revolutum de Candolle - Skunk Meadow-rue. 2n = 140.

Dry, open woods, often rocky.

Thalictrum thalictroides (Linnaeus) A.J. Eames & B. Boivin - Rue-anemone. 2n = 14.

Dry, open woods. [Anemonella thalictroides Linnaeus]

Thalictrum venulosum Trelease - Northern Meadow-rue. 2n = 42.

Sandy or gravelly shores, river thickets. [T. venulosum var. confine (Fernald) B. Boivin; T. confine Fernald]

Trollius laxus Salisbury - Spreading Globe-flower. 2n = 32.

Meadows and open swamps in calcareous soil.

XANTHORHIZA SIMPLICISSIMA Marshall - Yellowroot. 2n = 36.

Moist woods, shaded stream banks. From farther south.

Saururus cernuus Hooker & Arnott - Lizard's-tail. 2n = 22.

Stream borders, shallow water, swamps, marshes.

Celtis occidentalis Linnaeus - Hackberry. 2n = 20, 30, 40.

Rich woods, along streams, roadsides. [C. occidentalis var. canina (Rafinesque) Sargent; C. occidentalis var. pumila (Pursh) A. Gray]

Ulmus americana Linnaeus - American Elm. 2n = 56.

Rich soil along streams, roadsides.

ULMUS GLABRA Hudson - Wych Elm. 2n = 28.

Roadsides. From Eurasia.

ULMUS MINOR Miller - Smooth-leaved Elm. 2n = ?

Roadsides. From Eurasia and northern Africa. [U. CARPINIFOLIA Gleditsch]

ULMUS PARVIFOLIA Jacquin - Chinese Elm. 2n = 28.

Roadsides. From eastern Asia.

ULMUS PROCERA Salisbury - English Elm. 2n = 28.

Roadsides. From Europe.

ULMUS PUMILA Linnaeus - Siberian Elm. 2n = 28.

Railroads, roadsides, woodland borders. From Asia.

Ulmus rubra Muhlenberg - Slippery Elm. 2n = 28.

Rich soil, often calcareous, often along streams.

Ulmus thomasii Sargent - Rock Elm. 2n = 28.

Calcareous ledges, rich upland woods.

Boehmeria cylindrica (Linnaeus) Swartz - False Nettle. 2n = 28.

Moist or wet soil. [B. cylindrica var. drummondiana (Weddell) Weddell]

Laportea canadensis (Linnaeus) Weddell - Wood-nettle. 2n = 26.

Low, rich, moist woods, stream banks.

PARIETARIA JUDAICA Linnaeus - Spreading Pellitory. 2n = 26.

Cracks in sidewalks, ballast piles, waste heaps; usually around seaports. From the Mediterranean.

Parietaria pensylvanica Muhlenberg ex Willdenow - Pennsylvania Pellitory. 2n = 14, 16.

Rich, rocky, calcareous woods, waste places.

Pilea fontana (Lunell) Rydberg - Lesser Clearweed. 2n = ?

Moist to wet, shaded woods, mossy stream borders, springs, swamps.

Pilea pumila (Linnaeus) A. Gray - Richweed. 2n = 24, 26.

Moist, shaded areas.

URTICA DIOICA Linnaeus subsp. DIOICA - Stinging Nettle. 2n = 52.

Waste places, roadsides. From Eurasia.

Urtica dioica Linnaeus subsp. gracilis (Aiton) Selander - Wild Stinging Nettle. 2n = 26, 52.

Thickets, rich, damp soil, roadsides, waste places. [U. gracilis Aiton; U. procera Muhlenberg ex Willdenow; U. viridis Rydberg]

URTICA URENS Linnaeus - Dog Nettle. 2n = 24, 26.

Waste places, roadsides. From Eurasia.