Corolla of a purple Gerardia laid open, showing the four stamens; the cross shows where the fifth stamen…
Corolla, laid open, and stamens of Pentstemon grandiflorus, with a sterile filament in the place of…
Corolla of Catalpa laid open, displaying two good stamens and three abortive ones or vestiges.
Purslane-flower in section; calyx, petals, stamens adnate to lower half of ovary,-perigynous.
Hawthorn-blossom in section; parts adnate to whole face of ovary. and with each other beyond; another…
Diagram of papilionaceous flower, with bract below; axis of inflorescence above.
Corolla of Morning Glory laid open, to show the five stamens inserted on it, near the base.
Style of a Lady's Slipper (Cypripedium), and stamens united with it; the anther of the two good stamens;…
Flower of Lobelia cardinalis, Cardinal flower; corolla making approach to the ligulate form; filaments…
One of five stamen-clusters of the flower of American Linden, with accompanying scale.
Stamen of Moonseed, with anther cut across; this 4-celled, or rather 4-locellate.
Stamen of Pentstemon pubescens; the two-anther-cells diverging, and almost confluent.
Stamen of Mallow; the anther supposed to answer to that of Pentstemon pubescens, but the cells completely…
Very short filament bearing a single anther-cell; it is open from top to bottom, showing the pollen…
Stamens of the mint family. Of a Monarda: the two anther-cells with bases divergent so that they are…
Magnified pollen of Hibiscus and other Mallow plants, beset with prickly projections.
A plant with large fleshy leaves that yields many products. It is a tall plant with a spiny top that…
A plant that varies in size but always has thick fleshy leaves that are spined. It also contains a juice…
A North American poisonous herb. The plant itself usually has a blossom between two large green fleshy…
Pollen, a pair of pollinia of a Milkweed, Asclepias, attached by stalks to a gland.
Pollinium of an Orchis (Habenaria), with its stalks attached to a sticky gland.
Two simple carpals or pistil-leaves, united at the base only, cut across both above and below.
Compound 3-carpellary pistil of common St. John's-wort, cut across: the three styles separate.
The same of shrubby St. John's-wort; the three styles as well as ovaries here united into one.
Compound 3-carpellary pistil of Tradescantia or Spiderwort; the three stigmas as well as styles and…
Pistil of a Sandwort, with vertical and transverse section of the ovary: free central placenta.