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Of the Heath family (Ericaceae), the rhodora (Rhododendron canadense).

Rhodora

Of the Heath family (Ericaceae), the rhodora (Rhododendron canadense).

Of the Heath family (Ericaceae), the flame azalea (Rhododendron calendulaceum).

Flame Azalea

Of the Heath family (Ericaceae), the flame azalea (Rhododendron calendulaceum).

Of the Heath family (Ericaceae), the pinxter flower (Rhododendron nudiflorum).

Pinxter Flower

Of the Heath family (Ericaceae), the pinxter flower (Rhododendron nudiflorum).

Of the Diapensia family (Diapensiaceae), pyxie moss (Pyxidanthera barbulata) and an "enlarged blossom showing the alternate connection of stamens with the lobes of the corolla." -Mathews, 1902

Pyxie Moss

Of the Diapensia family (Diapensiaceae), pyxie moss (Pyxidanthera barbulata) and an "enlarged blossom…

Of the Primrose family (Primulaceae), the dwarf Canadian primrose (Primula mistassinica).

Dwarf Canadian Primrose

Of the Primrose family (Primulaceae), the dwarf Canadian primrose (Primula mistassinica).

Of the Primrose family (Primulaceae), the shooting star (Dodecatheon Meadia).

Shooting Star

Of the Primrose family (Primulaceae), the shooting star (Dodecatheon Meadia).

Of the Gentian family (Gentianaceae), the smaller fringed gentian (Gentiana procera).

Smaller Fringed Gentian

Of the Gentian family (Gentianaceae), the smaller fringed gentian (Gentiana procera).

Of the Gentian family (Gentianaceae), the bottle gentian (Gentiana Andrewsii).

Bottle Gentian

Of the Gentian family (Gentianaceae), the bottle gentian (Gentiana Andrewsii).

Of the Gentian family (Gentianaceae), the striped gentian (Gentiana villosa).

Striped Gentian

Of the Gentian family (Gentianaceae), the striped gentian (Gentiana villosa).

Of the Gentian family (Gentianaceae), the Gentiana Porphyrio.

Gentian

Of the Gentian family (Gentianaceae), the Gentiana Porphyrio.

Of the Gentian family (Gentianaceae), the soapwort gentian (Gentiana Saponaria).

Soapwort Gentian

Of the Gentian family (Gentianaceae), the soapwort gentian (Gentiana Saponaria).

Of the Gentian family (Gentianaceae), yellow bartonia (Bartonia virginiana).

Yellow Bartonia

Of the Gentian family (Gentianaceae), yellow bartonia (Bartonia virginiana).

Of the Convolvulus family (Convolvulaceae): top, hedge bindweed (Convolvulus sepium); bottom, common dodder (Cuscuta Gronovii).

Bindweed and Dodder

Of the Convolvulus family (Convolvulaceae): top, hedge bindweed (Convolvulus sepium); bottom, common…

Of the Borage family (Boraginaceae), the hound's tongue (Cynoglossum officinale).

Hound's Tongue

Of the Borage family (Boraginaceae), the hound's tongue (Cynoglossum officinale).

Of the Borage family (Boraginaceae), the forget-me-not (Myosotis scorpioides). Small images: top, spring forget-me-not; bottom, smaller forget-me-not.

Forget-Me-Not

Of the Borage family (Boraginaceae), the forget-me-not (Myosotis scorpioides). Small images: top, spring…

Of the Mint family (Labiatae), the wild bergamot (Monarda fistulosa var. rubra).

Wild Bergamot

Of the Mint family (Labiatae), the wild bergamot (Monarda fistulosa var. rubra).

Of the Mint family (Labiatae), the self-heal (Prunella vulgaris).

Self-Heal

Of the Mint family (Labiatae), the self-heal (Prunella vulgaris).

Of the Nightshade family (Solanaceae), the leaf and flower of the bittersweet nightshade (Solanum Dulcamara).

Bittersweet Nightshade

Of the Nightshade family (Solanaceae), the leaf and flower of the bittersweet nightshade (Solanum Dulcamara).

Of the Nightshade family (Solanaceae), the leaf and flower of the Virginia ground cherry (Physalis virginiana).

Virginia Ground Cherry

Of the Nightshade family (Solanaceae), the leaf and flower of the Virginia ground cherry (Physalis virginiana).

Of the Figwort family (Scrophulariaceae), the Alpine speedwell (Veronica alpina).

Alpine Speedwell

Of the Figwort family (Scrophulariaceae), the Alpine speedwell (Veronica alpina).

Of the Figwort family (Scrophulariaceae), the fern-leaved false foxglove (Gerardia pedicularia).

Fern-Leaved False Foxglove

Of the Figwort family (Scrophulariaceae), the fern-leaved false foxglove (Gerardia pedicularia).

Of the Figwort family (Scrophulariaceae), Castilleja pallida var. septentrionalis.

Castilleja

Of the Figwort family (Scrophulariaceae), Castilleja pallida var. septentrionalis.

Of the Figwort family (Scrophulariaceae), the yellow rattle (Rhinanthus Crista-Galli).

Yellow Rattle

Of the Figwort family (Scrophulariaceae), the yellow rattle (Rhinanthus Crista-Galli).

Of the Figwort family (Scrophulariaceae), the eyebright (Euphrasia americana).

Eyebright

Of the Figwort family (Scrophulariaceae), the eyebright (Euphrasia americana).

Of the Figwort family (Scrophulariaceae), the lousewort (Pedicularis canadensis).

Lousewort

Of the Figwort family (Scrophulariaceae), the lousewort (Pedicularis canadensis).

Of the Broom-rape family (Orobanchaceae), the naked broom-rape (Orobanche uniflora).

Naked Broom-Rape

Of the Broom-rape family (Orobanchaceae), the naked broom-rape (Orobanche uniflora).

Of the plantain family (Plantaginaceae), the common plantain (Plantago major).

Common Plantain

Of the plantain family (Plantaginaceae), the common plantain (Plantago major).

Of the Honeysuckle family (Caprifoliaceae), the bush honeysuckle (Diervilla Lonicera).

Bush Honeysuckle

Of the Honeysuckle family (Caprifoliaceae), the bush honeysuckle (Diervilla Lonicera).

Of the Bellflower family (Campanulaceae), the harebell (Campanula rotundifolia).

Harebell

Of the Bellflower family (Campanulaceae), the harebell (Campanula rotundifolia).

Of the Lobelia family (Lobeliaceae), the cardinal flower (Lobelia cardinalis).

Cardinal Flower

Of the Lobelia family (Lobeliaceae), the cardinal flower (Lobelia cardinalis).

Of the Composite family (Compositae), the oxeye (Heliopsis helianthoides).

Smooth Oxeye

Of the Composite family (Compositae), the oxeye (Heliopsis helianthoides).

Of the Composite family (Compositae), the purple cone-flower (Brauneria pallida).

Purple Cone-Flower

Of the Composite family (Compositae), the purple cone-flower (Brauneria pallida).

Of the Composite family (Compositae), the brown-eyed Susan (Rudbeckia triloba).

Brown-Eyed Susan

Of the Composite family (Compositae), the brown-eyed Susan (Rudbeckia triloba).

Of the Composite family (Compositae), the ten-petaled sunflower (Helianthus decapetalus).

Ten-Petaled Sunflower

Of the Composite family (Compositae), the ten-petaled sunflower (Helianthus decapetalus).

Of the Composite family (Compositae), the larger bur marigold (Bidens laevis).

Larger Bur Marigold

Of the Composite family (Compositae), the larger bur marigold (Bidens laevis).

Of the Composite family (Compositae), the smaller bur marigold (Bidens cernua).

Smaller Bur Marigold

Of the Composite family (Compositae), the smaller bur marigold (Bidens cernua).

Of the Composite family (Compositae), the arnica (Arnica mollis var. petiolaris).

Arnica

Of the Composite family (Compositae), the arnica (Arnica mollis var. petiolaris).

Of the Composite family (Compositae), the red-seeded dandelion (Taraxicum erythrospermum).

Red-Seeded Dandelion

Of the Composite family (Compositae), the red-seeded dandelion (Taraxicum erythrospermum).

Of the dayflower family (Commelina), the Asiatic dayflower (Commelina communis).

Asiatic Dayflower

Of the dayflower family (Commelina), the Asiatic dayflower (Commelina communis).

Of the dayflower family (Commelina), the slender dayflower (Commelina erecta).

Slender Dayflower

Of the dayflower family (Commelina), the slender dayflower (Commelina erecta).

Of the bellwort family (Uvularia), the perfoliate bellwort (Uvularia perfoliata).

Perfoliate Bellwort

Of the bellwort family (Uvularia), the perfoliate bellwort (Uvularia perfoliata).

Of the mud plantain family (Heteranthera), the blue mud plantain (Heteranthera limosa).

Blue Mud Plantain

Of the mud plantain family (Heteranthera), the blue mud plantain (Heteranthera limosa).

The Pogonia affinis.

Pogonia affinis

The Pogonia affinis.

The Pogonia divaricata or rosebud orchid.

Pogonia divaricata

The Pogonia divaricata or rosebud orchid.

The coffee senna or Cassia occidentalis.

Cassia occidentalis

The coffee senna or Cassia occidentalis.

"The dandelion; a so-called stemless plant." -Bergen, 1896

Dandelion

"The dandelion; a so-called stemless plant." -Bergen, 1896

"Rootstock of Cotton-Grass (Eriophorum)." -Bergen, 1896

Cottongrass

"Rootstock of Cotton-Grass (Eriophorum)." -Bergen, 1896

"Roots, rootstocks, and leaves of iris." -Bergen, 1896

Iris

"Roots, rootstocks, and leaves of iris." -Bergen, 1896

"Stem of "Smilax" (Myrsiphyllum). l, scale-like leaves; cl, cladophyll, or leaf-like branch, growing in the axil of the leaf; ped, flower-stalk, growing in the axil of a leaf." -Bergen, 1896

Smilax

"Stem of "Smilax" (Myrsiphyllum). l, scale-like leaves; cl, cladophyll, or leaf-like branch, growing…

"A, a pear leaf-bud in autumn; B, a leafy shoot derived from A, as seen in the middle of the following summer, with flower-bud at tip; C, the fruit-spur, B, in autumn, after the fall of the leaves." -Bergen, 1896

Pear Leaf-Bud

"A, a pear leaf-bud in autumn; B, a leafy shoot derived from A, as seen in the middle of the following…

"Fruit-bud of pear, showing its development. A, opening in spring; B, later, developing flowers and leaves; C, later still; only one flower has produced a fruit, the rest having fallen off. Below it is a lateral bud which will continue the spur next year." -Bergen, 1896

Pear Fruit-Bud

"Fruit-bud of pear, showing its development. A, opening in spring; B, later, developing flowers and…

"A slowly grown twig of cherry, three inches long and about ten years old. The pointed bud, l, is a leaf-bud; the more obtuse accessory buds, f, f, are flower-buds." -Bergen, 1896

Cherry Twig

"A slowly grown twig of cherry, three inches long and about ten years old. The pointed bud, l, is a…

"Palmately divided leaf of buttercup." -Bergen, 1896

Buttercup Leaf

"Palmately divided leaf of buttercup." -Bergen, 1896

"Leaf of pansy, with leaf-like stipules." -Bergen, 1896

Pansy Leaf

"Leaf of pansy, with leaf-like stipules." -Bergen, 1896

"Leaves standing nearly vertical in compass-plant. (Silphium laciniatum). A, view from east or west; B, from north or south." -Bergen, 1896

Compass Plant

"Leaves standing nearly vertical in compass-plant. (Silphium laciniatum). A, view from east or west;…

"Common Pitcher-Plant (Sarracenia purpurea). At the right one of the pitcher-like leaves is shown in cross-section." -Bergen, 1896

Common Pitcher Plant

"Common Pitcher-Plant (Sarracenia purpurea). At the right one of the pitcher-like leaves is shown in…

"The parts of the flower. cal, calyx; cor, corolla; st, stamens; p, pistil." -Bergen, 1896

Flower Parts

"The parts of the flower. cal, calyx; cor, corolla; st, stamens; p, pistil." -Bergen, 1896

"Apetalous flower of (European) wild ginger." -Bergen, 1896

Wild Ginger Flower

"Apetalous flower of (European) wild ginger." -Bergen, 1896

"Flower of stonecrop. I, entire flower. II, vertical section." -Bergen, 1896

Stonecrop Flower

"Flower of stonecrop. I, entire flower. II, vertical section." -Bergen, 1896

"Irregular corolla of sweet pea. A, side view; B, front view. s, standard; w, w, wings; k, keel." -Bergen, 1896

Sweet Pea Flower

"Irregular corolla of sweet pea. A, side view; B, front view. s, standard; w, w, wings; k, keel." -Bergen,…