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The earliest cultivated plant in North America is the bottle gourd, remains of which have been excavated at Little Salt Spring, Florida dating to 8000 BCE. [7] Squash (Cucurbita pepo var. ozarkana) is considered to be one of the first domesticated plants in the Eastern Woodlands, having been found in the region about 5000 BCE, though possibly not domesticated in the region until about 1000 BCE.
The plants also require abundant light during the day for the brightest color. [13] Semi-evergreen, they generally lose most of their leaves during winter. [14] The flowers of the poinsettia are unassuming. They are grouped within the cyathia (small yellow structures found in the center of each leaf bunch, or false flowers). [11]
The plant is native to: North America across Canada, the eastern and central United States, the Great Plains, and in Alaska; the Caribbean on Cuba, Hispaniola, and Jamaica; and South America in the southern bioregion (Argentina, Chile, Paraguay, Uruguay), the western bioregion (Bolivia, Peru), and Brazil.
The plants are small, 20 to 60 centimetres (7.9 to 23.6 in) depending on variety, making them suitable for growing in pots, greenhouses, or commercially in polytunnels. The plants are perennial, provided they are protected from cold. The fruits can be green, orange, red, or purple, and vary in shape from round and knobbly to smooth and elongated.
Vavilov's 1924 scheme suggested that plants were domesticated in China, Hindustan, Central Asia, Asia Minor, Mediterranean, Abyssinia, Central and South America. A Vavilov center or center of origin is a geographical area where a group of organisms, either domesticated or wild, first developed its distinctive properties. [1]
A Palmer oak in Jurupa Valley is estimated to be 13,000 to 18,000 years old. The plant, which looks like a sprawling, dark green shrub, is now at the center of a development battle.
Physocarpus are deciduous shrubs with peeling bark [2] and alternately arranged leaves. The leaves are palmate with 3 to 7 lobes and often toothed edges. The inflorescence is a cluster of bell-shaped flowers with 5 rounded white or pink petals and many stamens.
The Conservation Status of Trillium in North America. Hockessin, DE and Albuquerque, NM: Mt. Cuba Center, and New Mexico BioPark Society. ISBN 979-8-9850471-0-3; Patrick, Thomas S. (August 1986), The trilliums of eastern North America (mimeographed handout), Knoxville: University of Tennessee, pp. 1– 7