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ONAGRACEAE

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Originally appearing in Volume V20, Page 105 of the 1911 Encyclopedia Britannica.
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ONAGRACEAE , in See also:

botany, an See also:order of See also:dicotyledons belonging to the See also:series Myrtiflorae, to which belongs also the See also:myrtle order, Myrtaceae. It contains about 36 genera and 300 See also:species, and occurs chiefly in the temperate. See also:zone of the New See also:World, especially on the Pacific See also:side. It is represented in See also:Britain by several species of Epilobium (See also:willow-See also:herb), Circaea (enchanter's See also:nightshade), and Ludwigia, a small perennial herb very rare in boggy pools in See also:Sussex and See also:Hampshire. The See also:plants are generally herbaceous, sometimes See also:annual, as species of Epilobium, Clarkia, Godetia, or biennial, as Oenothera biennis—evening See also:primrose—or sometimes become shrubby or arborescent, as See also:Fuchsia (q.v.). The See also:simple leaves are generally entire or inconspicuously toothed, and are alternate, opposite or whorled in arrangement; they are generally exstipulate, but small See also:caducous stipules occur in Fuchsia, Circaea and other genera. The See also:flowers are often solitary in the See also:leaf-axils, as in many fuchsias, Clarkia, &c., or associated, as in Epilobium and Oenothera, in large showy terminal spikes or racemes; in Circaea the small See also:white or red 1 He is said to have reigned seven days, but the LXX. (B) in 1 See also:Kings xvi. 15 read seven years. Further confusion is caused by the fact that the LXX. reads Zimri throughout for See also:Omri. flowers are See also:borne in terminal and lateral racemes. The See also:regular flowers have the parts in fours, the typical arrangement as illustrated by Epilobium, Oenothera and Fuchsia being as follows: 4 sepals, 4 petals, two alternating whorls of 4 stamens, and 4 inferior carpels. The floral receptacle is produced above the ovary into the so-called calyx-See also:tube, which is often petaloid, as in Fuchsia, and is sharply distinguished from the ovary, from which it separates of ter flowering.

In Clarkia the inner whorl of stamens is often barren, and in an allied genus, Eucharidium, it is absent. In Circaea the See also:

flower has its parts 0 r, Flower cut open after removal of of Circaea. sepals; 2, See also:fruit; 3, floral See also:diagram. in twos. Both sepals and petals are See also:free; the former have a broad insertion, are valvate in bud, and reflexed in the flower; in Fuchsia they are petaloid. The petals have a narrow See also:attachment, and are generally convolute in bud; they are entire (Fuchsia) or bilobed (Epilobium); in some species of Fuchsia they are small and See also:scale-like, or absent (F. apetala). The stamens are free, and those of the inner whorl are generally shorter than those of the See also:outer whorl. The flowers of Lopezia (Central See also:America) have only one fertile stamen. The large spherical See also:pollen grains are connected by viscid threads. The typically quadrilocular ovary contains numerous ovules on See also:axile placentas; the 1-to-2-celled ovary of Circaea has a single sa. ovule in each loculus. The See also:long slender See also:style has a capitate (Fuchsia), 4-rayed (Oenothera, Epilobium) or 4-notched (Cir- caea) stigma. The flowers, which have generally an at- tractive corolla and See also:honey secreted by a swollen disk at the See also:base of the style or on the See also:lower See also:part of the " calyx-tube," are adapted for See also:pollination by See also:insects, chiefly bees and lepi- doptera; sometimes by See also:night- flying insects when the flowers are See also:pale and open towards evening, as in evening primrose. The fruit is generally a See also:capsule splitting into 4 valves and leaving a central See also:column on which the seeds are borne as in Epilobium and Oenothera- in the former the seeds are scattered by aid of a long tuft of silky hairs on the broader end.

In Fuchsia the fruit is a See also:

berry, which is sometimes edible, and in Circaea a See also:nut bearing recurved bristles. The seeds are exalbuminous. Several of the genera are well known as See also:garden plants, e.g. Fuchsia, Oenothera, Clarkia and Godetia. Evening primrose (Oenothera biennis), a native of See also:North America, occurs apparently See also:wild as a garden See also:escape in Britain. Jussieua is a tropical genus of See also:water- and See also:marsh-herbs with well-See also:developed aerating See also:tissue.

End of Article: ONAGRACEAE

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