Foliage of a young Juglans hindsii: Westonbirt, Gloucestershire, September. A number of much younger trees with wild provenance are growing at Westonbirt Arboretum, Gloucestershire (Forestry England 2019). Taller than its southern counterpart. It measures 93 feet high, with a trunk circumference of 444 inches and a crown spread of 118 feet. Sm. ex R. E. Sm. It is threatened by hybridization with orchard trees, urbanization, and habitat conversion to agriculture. Botanical Description. About Northern California Black Walnut (Juglans hindsii) 12 Nurseries Carry This Plant Add to My Plant List; Juglans hindsii, the Hinds' Black Walnut, also called the Northern California Walnut, is a large tree (up to 60 feet tall) endemic to roughly circular area in California centered near Fresno and reaching the San Francisco Bay area.Some authorities (i.e. Flower All Juglans are monoecious, bearing male and female reproductive organs on separate flowers on the same tree. Leaflets are ovate, with pointed tips and smooth margins. Common Name - Northern California walnut. It is most helpful to compare mature leaves. Family - Juglandaceae. It is hardy to zone (UK) 8. Juglans hindsii California black walnut Canopies of pinnately compound leaves form a round-topped tree 20 - 60 ft. tall. It has been widely used as a rootstock for grafting J. regia and has been planted extensively in many parts of California for this purpose. Space 30-60 ft apart. NATIVE Stem: trunk 6--23 m. Defining the sources of Paradox: DNA sequence markers for North American walnut (Juglans L.) species and hybrids. Tap map to see plants native to location . Most commercial walnuts are grafted onto either J. hindsii itself or a Paradox hybrid, either seed raised or clonal (see below): each has its own pattern of resistance and susceptibility to fungal and bacterial diseases ( University of California, Davis 2013 ). Some authorities i.e. … The Yorkshire Arboretum has a specimen from the same collection, which was about 4 m tall in 2019 and not thriving (J. Grimshaw, pers. No evidence of introgression from J. regia was seen, perhaps because Paradox hybrids generally have low fertility. Juglans ... Juglans hindsii × regia Paradox hybrid walnut Juglans ×intermedia [nigra × regia] hybrid walnut Juglans jamaicensis West … Offspring of California black walnut (Juglans hindsii) pollinated by Persian walnut (J. regia) is superior to its parents in several important traits (Potter et al., 2002; Li, 2017). Welma Stonehouse, in Nuts and Seeds in Health and Disease Prevention, 2011. It i This black walnut is endemic to Northern California and possibly has only a few native stands remaining. The largest specimen claimed as J. hindsii is at the Valley Gardens, Windsor Great Park (16 m × 45 cm in 2008); it is recorded as ‘from Seattle’ and hence not directly from a wild source (The Tree Register 2019). Beyond the Pacific states, where J. hindsii and perhaps even more its hybrids are planted in the landscape, there is little evidence of this species being cultivated in North America. There has been controversy, summarised by Potter et al. (2007) and Zhang et al. Leaves are compound, composed of 7-9 leaflets, which have prominent, herring-bone venation. There seems little doubt that this species should be hardy elsewhere on the Atlantic fringes of Europe. Juglans regia Linnaeus, the walnut of commerce, is widely cultivated in California; it is easily distinguished from native species by its leaves with 5-11 broad, entire leaflets and nuts with thin rugulose shells, not grooved or ridged. Both were included in the wider phylogenetic studies of Stanford et al. Juglans hindsii: leaf scar. For propagating by seed: 22.5 wks. De jonge, bruine twijgen zijn behaard, oudere worden kaal.… Lees meer There are currently no active references in this article. These two treatments appear to have been used in parallel long into the 20th century giving rise to confusion in records. Willis Jepson, an early authority on the Californian flora, named it Hinds’s Walnut in his honour as a subspecies of J. californica in 1908, maintaining this treatment in his influential Flora of California (Jepson 1909). Further, J. californica lacks clusters of hairs in the axils of major veins on the underside (Whittemore & Stone 1997). Most commercial walnuts are grafted onto either J. hindsii itself or a Paradox hybrid, either seed raised or clonal (see below): each has its own pattern of resistance and susceptibility to fungal and bacterial diseases (University of California, Davis 2013). Leaflets are ovate, with pointed tips and smooth margins, 6–23 m typically! Endemic ( limited ) to California flowers on the same doubt oblong,,. Hybridization with orchard trees, urbanization, and this treatment encompasses both types black blossom of! 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