Of the Composite family (Compositae), the Allegheny hawkweed (Hieracium paniculatum).
Of the arrowhead family (Sagittaria), the narrow-leaved arrowhead (Sagittaria subulata).
Of the spiderwort family (Tradescantia), clockwise from top: T. bracteata, T. pilosa, T. montana, T.…
Of the pink family (Caryophyllaceae), the larger mouse-ear chickweed (Cerastium vulgatum).
Of the pink family (Caryophyllaceae), the night-flowering catchfly (Silene noctiflora).
Of the false mermaid family (Limnanthaceae), the false mermaid (Floerkea prosperpinacoides).
Of the figwort family (Scrophulariaceae), the small snapdragon (Antirrhinum Orontium).
"Fruit-bud of pear, showing its development. A, opening in spring; B, later, developing flowers and…
"Leaves standing nearly vertical in compass-plant. (Silphium laciniatum). A, view from east or west;…
"Bees visiting flowers. At the left, a bumblebee on the flower of the dead nettle; below, a similar…
"Dimorphous flowers of the primrose. I, a long-styled flower; II, a short-styled one." -Bergen, 1896
"A violet with cleistogamous flowers. The objects which look like flower-buds are cleistogamous flowers…
"Raceme of common red currant. p, peduncle; p', pedicel; br, bract." -Bergen, 1896
"Head of yarrow. A, top view; B, lengthwise section. re, receptacle; i, involucre; r, ray-flowers; d,…
"Diagrams of inflorescence. A, panicle; B, raceme; C, spike; D, head; E, umbel." -Bergen, 1896
"Compound cyme of mouse-ear chickweed. t, the terminal (oldest) flower." -Bergen, 1896
"Diagram of inflorescence of a grass. g, sterile glumes; P1, a flowering glume; P2, a scaly bract (palea);…
"Inflorescence, flower, and seed, of a sedge. (Great Bulrush, Scirpus lacustris.) A, magnified flower,…
"Alnus glutinosa. A, a flowering twig; s, staminate catkins; p, pistillate catkins; B, a group of staminate…
"Ulmus campestris. A, a flowering twig; B, a flower; C, longitudinal section of a flower; D, a fruit."…
"Euphorbia corollata. A, flower-cluster with involucre, the whole appearing like a single flower; B,…
"Begonia Flowers. A, staminate flower; B, pistillate flower; C, twisted stigmas, enlarged; D, cross-section…
"Flower and fruit of Umbelliferae. A, flower of Foeniculum; B, fruit of Heracleum; C, fruit of Heracleum,…
"Flowers of plantain (Plantago), enlarged. A, earlier stage, pistil mature, stamens not yet appearing…
"Flower-cluster of yarrow (Achillea Millefolium). A, head seen from above; B, longitudinal section;…