Juglans hindsii
Juglans hindsii
Juglans hindsii is limited to California and Oregon species of the genus walnuts ( Juglans ). It is as rootstock for walnut in California of economic importance.
Features
Juglans hindsii is a 6 to 23 meter high tree. Its bark is light to medium gray and splintered into smooth or scaly plates. The branches are connected to the distal edge of the leaf scar, in which they appear, weakly notched up deep. They are not surrounded by a well- circumscribed band of hair. The terminal buds are ellipsoidal to oblong, flattened and 6-8 mm long.
The leaves are pinnate and 22 to 45 cm long, the petiole 3-8 cm. The 13 to 21 leaflets are narrowly triangular to lanceolate, symmetrical or slightly falcate, 7.3 up to 13 cm long and 1.9 to 2.8 cm wide. The leaf margin serrate, pointed the blade end. The lower leaf surface is occupied bald or with individual glandular hair, sitting on the main nerve individual glands and a few capitate - glandular hairs. In the axils of the nerves near the base of the leaf are eye-catching hair which sometimes extend to the leaf surface. The upper leaf surface is occupied glabrous or with scattered scales, the main nerves are occupied glabrous or with scattered glands and a few little head - glandular hairs, easy hair missing. The terminal leaflets is well developed.
The male catkins are 6-15 cm long, each flower has 20-40 stamens. The pollen sacs are 1 to 1.4 mm long. The bloom is in spring ( April, May ).
The fruit is globose and 2.5 to 5 cm in size. The nuts are ovate to ovate - globose and 2.4 to 3.2 cm in size. It is smooth or almost smooth or has flat and indistinct ridges and grooves.
Dissemination
The distribution area of Juglans hindsii is limited to California and Oregon ( Jackson County). Before about 1850 the way grew up in California in a few places. Due to their widespread use as a base for grafting of European real walnut was planted in many areas of California and is wild and naturalized in these areas. It forms also hybrids with genuine walnut, which are the most common rootstocks in commercial walnut cultivation today.
Juglans hindsii grows on river banks and slopes from sea level to about 300 m altitude.
Etymology and systematics
The name honors the botanist Juglans hindsii Richard Brinsley Hinds (1812-1847), who discovered the plant in 1837. The species was formerly placed as a variety Juglans californica to. The Flora of North America as it leads own way also molecular studies support the species rank of Juglans hindsii
Documents
- Donald E. Stone: Juglandaceae. In: Flora of North America, Volume 3 (online)