Schaub rough lemon
Citrus jambhiri Lush. RUTACEAE
Photos by Toni Siebert, CVC. Photo rights.
Source: Received as budwood from the "Mother" tree, J. Carpenter, USDCS, Indio, Calif., 1983.
Parentage/origins: Parents unknown.
Rootstocks of accession: Carrizo citrange, C-35 citrange
Season of ripeness at Riverside: Unknown at this time.
Description from The Citrus Industry Vol. 1 (1967):
Fruit medium in size, of highly variable form but usually oblate to elliptic-oblong; commonly with irregularly furrowed or lobed basal collar or neck; usually with broad apical nipple surrounded by a deep irregular areolar furrow. Rind medium-thick; surface typically deeply pitted, and rough or bumpy, sometimes ribbed; easily separable; color lemon-yellow to brownish-orange. Segments about 10; axis large and hollow. Flesh color light yellow to pale orange; medium juicy; flavor moderately acid. Seeds numerous, small, highly polyembryonic, and cotyledons faintly green. Some crop throughout the year but mainly in winter.
Tree vigorous and large, upright-spreading, with numerous small thorns; leaves medium-small, blunt-pointed, and light green. Flowers small and mandarin-like, purple-tinged, and produced more or less throughout year, but mainly in spring and late summer. New shoot growth faintly purple-tinted. Sensitivity to cold about like that of true lemons.
This species exhibits a remarkable range of variation in fruit characters, and in India, where it is native, four relatively distinct types are recognized, one of which is similar to the form obtained from Italy known as C. volckameriana (for description see Chapot, 1965a). There is also a sweet-fleshed form.
Presumably native to northeastern India, where it still grows wild, the rough lemon seems to have been taken to southeast Africa by the Portuguese toward the end of the fifteenth or early sixteenth century and thence to Europe. It doubtless reached the New World not long thereafter.
Although used to some extent as a lemon substitute, for which it is not very suitable, the rough lemon is highly important as a rootstock in many parts of the world—notably India, South Africa, Australia, Argentina, Brazil, and Florida. In the last two mentioned countries, selections have recently been named—Estes and Milam—which exhibit resistance to the burrowing nematode.
While resemblances to the lemon are fairly obvious, the differences are greater, and many of its characters are clearly those of the Rangpur or mandarin."
Availability: Commercially available in California through the Citrus Clonal Protection Program.
USDA Germplasm Resources Information Network page for Schaub Rough lemon
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