= GENERAL KEY 
B. Corolla wanting, calyx sometimes corolloid. 
Flowers moneecious or dicecious, some or all in catkins or aments. 
Ovary many-ovuled, seeds hairy. Salicacee. 
Ovary with one or two ovules. 
Woody vines. Humulus. 
Trees or shrubs. 
Pistillate flowers not in catkins, solitary or in involucrate 
clusters. 
Leaves pinnate. Juglandacee. 
Leaves simple; fruits in cups or involucres. Fagacee. 
Pistillate flowers in catkins or heads. 
Calyx becoming fleshy in fruit. Moracez. 
Calyx not fleshy in fruit. 
Flowers and fruits in spherical heads. Platanacez. 
Flowers in elongated catkins, styles and stigmas two. 
Betulaceez. 
Flowers not in catkins. (See also Rosacez.) 
Submerged aquatics. (See also Myrtales.) 
Leaves whorled, dissected. Ceratophyllacez. 
Leaves opposite, entire. Callitrichacez. 
Terrestrial plants, or if aquatic, not submerged. 
Carpels several and distinct. 
Herbs, leaves not punctate. RANALES. 
Woody plants with punctate leaves. Xanthoxylum. 
Carpels single or united into a compound ovary. 
Fruit an achene. 
Stipules sheathing the stem, or achenes triangular. 
Poly gonacez. 
Stipules not sheathing the stem. Urticacee. 
Fruits various, but not achenes. 
Trees. 
Leaves alternate Ulmacee. 
Leaves opposite, fruit a samara. 
Samara single, oar-shaped. Fraxinus. _ 
Samaras in pairs. Acer. - 
Shrubs with fleshy fruits. Rhamnacee. 
Herbs. (All our species herbaceous.) 
Latex present, fruit three-celled, three-seeded: flowers 
much reduced, the involucrate cluster of flowers 
easily mistaken for a flower. Euphorbiacee. 
Without latex, fruit various. Caryophyllacez. 
Ovary inferior, perianth attached above it, calyx often persisting at 
the top of the fruit. 
Vines with tendrils. flowers moneecious or diccious. Cucurbitacez. 
Aquatics with whorled leaves. MYRTALES. - 
Plants not as above. 
Corolla wanting, calyx sometimes corolloid. . 
Ovary only partly inferior, fruit a many-seeded capsule. 
Saxifragacez. 
Ovary not truly inferior, but surrounded permanently by the 
base of the perianth, making it appear so. 
Herbs with smooth opposite leaves. Nvetaginacee. 
Trees or shrubs with scurfv foliage. Elezagnacee. 
Ovary truly inferior, leaves alternate. 
Trees with compound leaves. Juglandacez. 
Herbs with entire leaves. Comandra. 
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