May 25, 1914 
Eremocitrus 
89 
The spines, which are always single, are slightly to one side of the axil 
of the leaf and are usually very slender, 2 to 4 cm. long and only 1% to 2 
mm. in diameter. On old trees, especially on fruiting branches, they are 
often wanting. 
The flowers are borne either singly or in groups of two or three in the 
axils of the leaves on new growth, as in Citrus. The pedicels are slender, 
4 to 6 mm. long. The calyx is 3- to 5-lobed, sparsely hairy, the lobes 
acute. The petals are four or five (rarely three) in number, somewhat 
narrowed at the base, and broadly rounded or bluntly pointed at the tip, 
4 to 6 mm. long. There are four times as many stamens as petals, usually 
16 to 20, rarely 12 (in trimerous flowers); the filaments are slender, 
about 4 to 5 mm. long. The pistil is borne on a low disk and has an 
obovate ovary, with a rather thick subcylindric style 
(fig. 4); the ovary is 4- or rarely 3- to 5-celled; each 
cell contains two ovules. 
The fruits are small, globose, oblate, or sometimes 
pyriform, iK to 2% by 1% to 1% cm., having four 
(rarely three or five) cells filled with subglobose 
stalked pulp vesicles. The seeds are oval, yellowish 
gray, 5 to 6 by 3 to 4 by 2^2 to 3 mm., with a tough, 
longitudinally furrowed, and verrucose testa (see fig. 
2). The cotyledons are hypogeous in germination, 
and the young seedlings produce alternate slender 
cataphylls which only very gradually become broader 
and leaf-like. The young spiny plants, even when 
several years old, usually have only very narrow 
leaves, differing but slightly from the cataphylls of 
the young seedlings. (See fig. 3.) 
Fig. 4 —Eremocitrus glauca: 
Flower from which petals 
and stamens have fallen; 
showing pedicel, calyx 
(one sepal cut away), disk, 
ovary, style, and stigma; 
from a specimen collected 
by Robert Brown, No. 58, 
Sept., 1802 (?), Upper 
Head, Broad Sound, 
Queensland; in National 
Herbarium, Washington, 
D. C. X5. Drawn by 
J. M. Shull. 
DISTRIBUTION OF EREMOCITRUS 
Eremocitrus occurs in northeastern Australia from 
the Burdekin River, Queensland, latitude 21 0 S. 
(Mueller, 1858, p. 150; 1857, p. 169; Gregory, 1857, p. 237), to Dubbo, 
New South Wales, latitude 32 0 30' S.; also in the coast region near Broad 
Sound in Queensland, latitude 22 0 S. Specimens have been examined 
from the following localities: 1 
I. Queensland. 
Port Curtis District.— Broad Sound. Robert Brown, No. 5343, September, 
1802 [?] “Rutac ? suaveolens Aurantiac. genus 10 and. bacc. polysperma No. 58 desc. 
nost. [?] a Broad Sound. Ad margines dumetis prope Upper Head, Broad Sound/' 
Three twigs, two with flowers, one with young fruits, British Museum; fragment 
with flowers, Washington, D. C. (National Herbarium); no number, no date, four 
twigs, two with flowers, two with young fruits, Kew; 2 fragment in Washington, D. C. 
1 All of the specimens located in herbaria outside of Washington, D. C., were examined and photo¬ 
graphed by the writer, and prints enlarged to natural size have been filed in the National Herbarium at 
Washington, D. C. 
* This specimen has a locality label “ Broad Sound " in Robert Brown’s handwriting, but no other data. 
It is probably a part of No. 58, as the specimens are similar to those in the British Museum. 
