Question: Between the Lime and the Exochorda, which can be expected to have more variety between individual plants?

<P0-S0> Exochorda is a small genus of flowering plants in the family Rosaceae, native to China and central Asia (Turkestan). <P0-S1>  They are used as ornamental plants with the common name pearl bush, or pearlbush. <P0-S2>  Numerous species have been described on the basis of differing appearance and geographical separation, but a systematic study revealed that the different types are closely related and probably all descended from a single species that formerly had a wide distribution that has been fragmented by habitat loss. <P0-S3>  As a single species the correct name is "E. racemosa". <SEP> <P1-S0> Hand pollination, also known as mechanical pollination is a technique that can be used to pollinate plants when natural or open pollination is either undesirable or insufficient. <P1-S1>  This method of pollination is done by manually transferring pollen from the stamen of one plant to the pistil of another. <P1-S2>  This is often done with a cotton swab or small brush, but can also be done by removing the petals from a male flower and brushing it against the stigmas of female flowers, or by simply shaking flowers in the case of bisexual flowers, such as tomatoes. <P1-S3>  Common reasons for choosing this method include the lack of pollinators, keeping control of cross-pollination between varieties grown together, and creating specific hybrids. <P1-S4>  Examples of this are vanilla plants, which are transported to areas where its natural pollinator doesn't exist, or plants grown in greenhouses, urban areas, or with a cover to control pests, where natural pollinators cannot reach them. <P1-S5>  Pollinator decline and the concentrated pollination needs of monoculture can also be a factor. <P1-S6>  However, these are not the only reasons, and variable techniques for hand-pollination have arisen for many specialty crops. <P1-S7>  For instance, hand-pollination is used with date palms to avoid wasting space and energy growing sufficient male plants for adequate natural pollination. <P1-S8>  Because of the level of labor involved, hand-pollination is only an option on a small scale, used chiefly by small market gardeners and owners of individual plants. <P1-S9>  On large-scale operations, such as field crops, orchards, or commercial seed production, honeybees or other pollinators are a more efficient approach to pollination management. <P1-S10>  Despite this, hand-pollination is a fairly widespread practice. <P1-S11>  Pears grown in Hanyuan County, China have been hand-pollinated since the 1980s, because they can't be pollinated with other varieties that have different flowering times; also, lice infestation requires the use of many insecticide sprays, which causes local beekeepers to refuse to lend beehives. <SEP> <P2-S0> Diocirea is a genus of flowering plants in the figwort family, Scrophulariaceae. <P2-S1>  The genus is endemic to a small area in the south-west of Western Australia and is intermediate in character between "Eremophila" and "Myoporum". <P2-S2>  There are four members of the genus, all of which are small shrubs with stems and leaves which produce a resin making the plants appear bluish-green. <P2-S3>  Neither the genus, nor any of the species had been described before 2007 although a few specimens had been collected as "Eremophila elachantha". <P2-S4>  Despite their limited distribution, they often occur in populations of several thousand individual plants, forming a dense ground cover. <SEP> <P3-S0> A lime (from French "lime", from Arabic "līma", from Persian "līmū", "lemon") is a hybrid citrus fruit, which is typically round, lime green, 3 – in diameter, and contains acidic juice vesicles.