Tropical to subtropical and temperate New World, mostly North America, some established in Old World. Species 40+ (22 in the flora). Payne, W. W. 1964. A re-evaluation
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North American botanists, in general, have been conservative in their recognition of hybrids, probably in reaction to some European botanists who readily
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1997; R. F. Thorne 1992). Old World species of Allium are generally placed in subgenera and sections. Attempts to treat New World species similarly have gained
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naturalized in Old World tropics and subtropics. Genera 125–130, species ca. 1800 (34 genera, 189 species in the flora). The Cactaceae had a New World origin
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for the constituent taxa. As outlined in the key to species below, the two Old World sections present as adventives in our region are notable for their usually
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Cancer in the Old World, none in the New World. In an infrafamilial classification of the Rosaceae by D. Potter et al. (2007), Rosa is included in subfam
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worldwide, mostly Old World. Genera 100+, species 1700+ (26 genera, 99 species in the flora). Centers of concentration for anthemids are in the Mediterranean
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distribution can also be used in those cases. Fruits are critical for identifying some taxa in Arctostaphylos. Fruits are usually present in a population because
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and/or bristles. Introduced; Old World, especially Eurasia and n Africa, some species widely introduced and established in local floras. Genera ca. 40,
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crucifers) native in the flora area, 616 (418 endemic) grow in the United States, 140 (12 endemic) in Canada, and 31 (1 endemic) in Greenland. The latest
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3–6, connate. Fruits orange. Seeds 1–1.5 mm, not observed in flora area. 2n = 28, 42 (Old World). Phenology: Flowering late spring–late fall. Habitat: Usually
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genus and established two subgenera that he named Gerontogeae (sect. Arbutus) for the Old World taxa and Americanae for those of the New World. L. C. Hileman
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usually of 4–8[–16+] scales in ± 2+ series, sometimes coroniform. Introduced; mostly Old World (especially s Africa), some species widely introduced as
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naturalized in the flora area will increase. In our flora, P. arida, P. caerulea, and P. tarminiana are well-established escapes that are also popular in horticulture
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Introduced; s Old World, introduced also (perhaps some native) in Mexico, South America, s Oceanic Islands. Species 55 (2 in the flora). Some species of Cotula
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complicated by the fact that Eurasian material has been introduced in other parts of the world. In addition, hundreds of forage and turf cultivars have been developed
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widely cultivated and naturalized in eastern North America. In some species of Philadelphus, the axillary buds are enclosed in pouches of cortical and epidermal
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rhizomes. In some (e.g., L. kelloggii and L. rubescens), lateral growth is very slow and the bulb remains upright and more or less ovoid. In others, such
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demand for herbal remedies, both in the Flora of North America region and around the world, has resulted in regional declines in population size and number for
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concern. The curiosities were clearly different from their Old World counterparts, and in some instances they were entirely novel. The likes and near-likes
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