Oxanthera neo-caledonicaLarge-leaf oxanthera or false orange
Photos by Toni Siebert, CVC. First and fourth photographs by Aileen Lin. Photo rights.
Source: Received as seed from Dick Hamilton, Hawaii, 1978.
Parentage/origins: Parents unknown.
Rootstocks of accession: Yuma Ponderosa Lemon
Season of ripeness at Riverside: Year-round
Season of flowering at Riverside: December to March
Notes and observations:
EMN, 12/22/1987: This came in labelled "Oxanthera species". It is NOT oxanthera, appera to be a papeda.
Fruit almost all on ground. Leaves have wide winged petiole. Fruit about the size and shape of a Bearss lime, with ridged neck. Very smooth, yellow rind. Very thin rind, green flesh, very sour; probably seedless (one fruit sampled).
EMN, 10/19/1988: Most of fruit already on ground this date. Four fruits cut & one seed found. Leaves are thick and leathery. Fruit description of 12/87 still OK.
JB, 1990: Rind has a nice frangrance like tropical fruits.
RRK and OJB, 2000: This is not a papeda, although it was misidentified as "unknown papeda hybrid" for some time. Since it was received as Oxanthera sp., it was keyed out (RRK, OJB) using the key on p 255 of Swingle and Reece (1967) andd generally matches the description of O. neo-caledonica on p 257.
RRK, 08/2007: Malcolm Smith of Australia's DPI observed some wild Oxanthera spp.. He stated in an email dated May 10, 2004 (on file at NCGRCD) that our specimen did not resemble the plants he observed in the wild, particularly in regard to leaf morphology. He did note that Swingle stated that Oxanthera is a highly variable genus. Ottillia 'Toots' Bier opined that the differences in leaf morphology might be due to climate and cultural care. However, these differences (which indeed are rather pronounced) must make the identification of this accession questionable. Note: The information in Swingle and Reece (1967) is unchanged from the original in Swingle (1943).
Description from The Citrus Industry Vol. 1 (1967):
Guillaumin's detailed description of this plant reads, in translation, as follows: "Spineless shrub, 1 m high, with whitish flowers; young branches with a waxy bloom that gradually disappears. Leaves very coriaceous, glabrous even when very young, lanceolate or obovate, 6-8 cm long (including the petiole), 1-4 cm wide, narrowed toward the base, attenuate toward the apex, but not acute when lanceolate, suborbicular or orbicular when obovate, sometimes emarginate. Midrib and lateral veins prominent on both sides but especially on the underside (like veins of the hand). Petiole distinctly articulated [with the leaf blade], 1-2 cm long, slightly winged (less than 4 mm). Flower [bud] (a single one) terminal on a young branch, spherical (14 mm diam.); pedicel 7 mm long, cylindric, glabrous; sepals 5, 2 mm long, nearly round; petals 6, unequal, ovate (12 X 6-12 mm), thick and fleshy, with inconspicuous, small, pellucid oil glands; stamens 24, unequal (8-11 mm), [arranged] very irregularly in fascicles, filaments rather fleshy, not flattened, anthers triangular-elongate, 2.5 mm long, the locules diverging slightly at the base; ovary subcylindric (3.5 X 3 mm), 7-ribbed, with 7 segments; style cylindric, 2 mm long, stigma cylindric. Fruit (immature) ovoid-subcylindric, supported on pedicels covered with whitish bloom, more than 1.5 cm long and 2 mm diam.; more mature fruits 2.5 X 1.5 cm, with 7 segments, peel thin, pulp mucilaginous, seeds of unknown color.
Availability: Not commercially available in California.
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