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Acalypha rhomboidea
''Acalypha rhomboidea'' ( common three-seeded mercury,〔(PLANTS Profile for ''Acalypha rhomboidea'' ) Retrieved 2010-03-09〕 Rhombic three-seeded-mercury,〔(Germplasm Resources Information Network ) Retrieved 2010-03-10.〕 Rhomboid mercury, Copperleaf,〔(Illinois Wildflowers ) Retrieved 2010-03-08.〕 Rhombic copper-leaf, Three-seeded-mercury,〔(Robert W. Freckmann Herbarium University of Wisconsin - Stevens Point ) Retrieved 2010-03-08〕 Ricinelle rhomboide,〔(University of Guelph Weed Science Research Group ) Retrieved 2010-03-08.〕 Diamond threeseed mercury; syn. ''Acalypha urticifolia'' Raf., ''Acalypha virginica'' L. forma ''intermedia'' Millsp., ''Acalypha virginica'' L. var. ''rhombifolia'' Riddell,〔(Atlas of Florida Vascular Plants ) Retrieved 2010-03-10.〕 ''Acalypha virginica'' L. var. ''rhomboidea'' (Raf.) Cooperr.〔) is a plant in the spurge family, Euphorbiaceae.
==Description==
Common three-seeded mercury is an annual〔 herbaceous plant. It grows from a taproot,〔(Missouriplants.com ) Retrieved 2010-03-08〕 reaching 1/2–2 feet (15–61 cm) tall, and is usually without branches. The central stem can be either covered with fine white hairs or hairless.〔 The lanceolate to lanceolate-rhombic acute leaves are alternate with slightly hairy petioles about 1.5 inches (4 cm) long,〔 bluntly serrated margins, and pinnate venation.〔 Leaves are deep green and somewhat shiny above, light green and mostly hairless below and can be up to 2.75 inches (7 cm) long and 1.5 inches (4 cm) wide.〔 There is a tendency for the leaves to cluster near the top of the stem or stems. A conspicuous, slightly ciliate bract with 5-9 lobes is located where the leaf petiole meets the stem. This bract wraps around the inflorescence, which consists of a green cyathium. The cyathium contains minute staminate and pistillate flowers lacking petals.〔 Male flowers terminate the peduncle with capitate clusters. The flowers consists of 4 tiny golden green upwardly bent sepals, acute to blunt in shape, and many stamens. Female flowers consist of minute green sepals, a hairy tri-locular ovary, and three fringed styles. One seed per locule is produced.〔 The mature pods are tan colored, 1/15" (1.6-1.8mm) long, and deeply lobed.〔(Ontario Ministry of Agriculture Food & Rural Affairs ) retrieved 2010-03-08〕 There is no floral scent associated with the flowers.〔
This plant is somewhat unusual in that it has clear sap as opposed to the typically milky sap of other members of Euphorbiaceae.〔
''Acalypha rhomboidea'' is quite similar to ''Acalypha virginica''. The two may be distinguished by the number of lobes on the bracts; the latter has 9-15 lobes whereas the former has only 5-9.〔 ''Acalypha rhomboidea'' also resembles young redroot pigweed (''Amaranthus retroflexus L.''), but may be distinguished from the latter by the flower clusters, bracts, and occasionally bronze-green leaves of the former.〔
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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