By Robert H. Mohlenbrock

This quantity, the 8th dedicated to flowering vegetation within the Illus­trated vegetation of Illinois sequence, is the 3rd of numerous dedicated to dicotyledons, which come with such recognized vegetation as roses, peas, mustards, mints, nightshades, milkweeds, and asters. Mohlenbrock the following represents 4 orders and fifteen households of crops. The orders are the Annonales, Berberidales, Nymph­aeales, and Sarraceniales. The fifteen households that include them are usually conceded by means of such a lot botanists to be one of the such a lot primitive dwelling vegetation on this planet at the present time. those orders will be characterised more often than not as woody within the Annonales (except for the Saururaceae and a few Aristolochiaceae), herbaceous within the Berberidales (except for the Menispermaceae and a few Ber­beridaceae), aquatic within the Nymphaeales, and insectivorous within the Sarraceniales. As in past volumes during this sequence, the typical identify, or names, is the single used in the community in Illinois. each one species is illus­trated, depicting the distinguishing gains and the habitat in Illinois.

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The wood of this species is light and soft and has little economic value. Aristolochiaceae-Birthwort Family Herbs or shrubs, sometimes climbing; leaves basal or alternate; stipules absent; flowers perfect, actinomorphic or zygomorphic; calyx tubular, united at least at the base, 3-lobed; petals absent; stamens 6 or 12, closely appressed to the styles; ovary inferior or subinferior, 6-locular; fruit a capsule, many-seeded. This family is composed of eight genera, all but Asarum and Hexastylis primarily tropical.

Both Thorne's classification and that of Cronquist place the Menispermaceae, Ranunculaceae, and Berberidaceae in the same order, Thorne calling it the Berberidales and Cronquist choosing to use the name Ranunculales. Thorne adds the Papaveraceae to this order, while Cronquist assigns the Papaveraceae to the Papaverales. Thorne and Cronquist are in agreement as to the plants to be included in the Nymphaeales. The four orders treated in this book can be characterized generally as woody in the Annonales (except for the Saururaceae and some Aristolochiaceae), herbaceous in the Berberidales (except for the Menispermaceae and some Berberidaceae), aquatic in the Nymphaeales, and insectivorous in the Sarraceniales.

I appreciate their efforts. Mr. Douglas M. Ladd has assisted me in checking herbarium specimens and compiling distributional data. For his assistance, I am deeply grateful. Many thanks are also given to my wife, Beverly, who assisted me in several herbaria and who typed all the drafts of the manuscript. Page 6 Descriptions and Illustrations Order Annonales Thorne (1968), whose system of classification is being followed in The Illustrated Flora, considers the Annonales to be the most primitive of all extant flowering plants.

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