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Prunus rivularis
''Prunus rivularis'', known variously by the common names creek plum,〔 hog plum,〔 or wild-goose plum〔 is a thicket forming shrub. It prefers calcareous clay soil or limestone-based woodland soils. This deciduous plant belongs to the rose family Rosaceae, and is found mainly in the central United States. It is a shrub consisting of slender stems with umbel clusters of white blossoms. The fruit is a drupe that resembles a large berry; though it has a bitter taste, it serves as a source of food for birds and other wildlife. ''"Prunus"'' is Latin for plum, whereas ''"rivularis"'' means being near a stream.
==Description==
The leaves are simple and alternately arranged along the stems. The general shape of the leaf ranges between elliptic and ovate and is gauged out to be 5-6 centimeters (2.0-2.4 inches) long and 2-3 centimeters (0.8-1.2 inches)wide. The base shape of the leaf is considered cuneate while the apex is acuminate. The margin or edges is described as serrate; usually with 10-11 teeth per centimeter. Flowers of this plant usually blossom around March to April. The inflorescence type is considered as raceme, where there are flower spikes from stalks that pawn out from the stem. The flowers themselves stretch in entirety of 12-16 millimeter. They occur in clusters of 2 to 8 on leaf axils. The pedicels on which the flowers are attached to are measured out of around 15-16 millimeter. They have a green and glabrous (without hair and smooth) surface.〔 The hypanthium is considered as the floral tube. (Fusion of sepals, petals and stamen fused in a tube) ''Prunus rivularis'' is defined as a perigynous plant. (major parts of the flower are aligned with a superior ovary) The hypanthium’s length and width is measured out to be 2 to 2.5 millimeters respectively; and they are considered glabrous. (Surface devoid of hairs) 〔 The calyx lobes, or sepals of a flower, are found in a cluster of 5. The sepal has an oblong leaf shape and is measured 2 millimeters. The apex has a flat tip or truncate shape. There is a sugar producing gland at the tip in which the leaves cup around. Interesting to note that the margins ciliate (have fine tiny hairs) and the sides are pubescent. (Have short hairs) 〔 There are 5 white petals that are measured with a length of 5 millimeters. The petal margins are cupped and have an undulated (wavy) shape. There are on average of 20 stamen; the filaments are long and slender, 4-6 millimeter long while the anthers have a yellowish tint. The stamen is planted on the base of the hypanthium where the ovary is placed in the superior position. The ovary has a dark green hue and is measured 1-1.5 millimeter long while the style is white and is measured 5-6 millimeter long.〔 The fruit of the ripens in late July. It is a drupe with a stony endocarp, fleshy mesocarp and soft exocarp. They can appear alone or in a cluster of 2 or 3 other fruits. The pedicel that stems from the fruit is slender and glabrous, measured to be 13-16 millimeters long.〔 The fruit shape is globular and has an orangeish-reddish tint. It is 17-22 millimeters long as it is wide.〔 It has a very juicy mesocarp, though it is quite bitter in taste. The endocarp is 9-11 millimeters wide and 13-15 millimeters thick.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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