86 
Journal of Agricultural Research 
Vol. II, No. a 
organs, it seems necessary to create a new genus to include this interest¬ 
ing plant. 1 
Eremocitrus Swingle. 
The genus Eremocitrus resembles Citrus in the structure and appearance of the fruits; 
it differs from it (i) in the leaves which have on both surfaces palisade cells, sunken 
stomates, and appressed 
few-celled hairs; (2) in 
the 4- to 5-merous flowers, 
with free stamens and a 
4- or 5-celled ovary, with 
2 ovules in each cell. 
The leaves are gray- 
green, thick and leath¬ 
ery, and markedly pellu¬ 
cid punctate; they are 
nearly alike on both sides, 
having four ventral and 
two dorsal layers of pali¬ 
sade cells, sunken sto¬ 
mates, an epidermis with 
a thick cuticle, and scat¬ 
tered few-celled ap¬ 
pressed hairs on both 
surfaces. The spines are 
usually long and slen¬ 
der, but are sometimes 
wanting, especially on 
fruiting branches of old 
trees. They occur singly 
in the axils of the leaves. 
The twigs are gray-green, 
slender, very slightly 
angled when young, with 
scattered stomates at the 
base of deep, narrow pits, 
and two or more layers 
of palisade cells below 
the very thick-walled 
epidermis. The flowers 
occur singly or two or 
three together in the axils of the leaves and are borne on slender pedicels about 
as long or slightly longer than the petals. (See fig. 1.) The calyx is 3- to 5-lobed; 
the petals, four or five, rarely three in number, are more or less narrowed at the base; 
Fig. i. — Eremocitrus glauca: Twigs from a syntypic specimen collected 
by T. I#. Mitchell, near Forestvale, Queensland, Australia, on October 
17, 1846; from Gray Herbarium. A, Spiny twig showing a single 
flower; B, spineless sterile twig; natural size. C, tetramerous flower 
seen from the side. X5. Drawn by Theodor Holm. 
1 EREMOCITRUS gen. nov. (spr)pu>c deserta + Citrus).—Genus Citro affinis, foliis utrinque stomatibus 
pilisque instructis; floribus 4- vel 5-meris, staminibus liber is, ovario 4- vel 5-loculare, loculis 2-spermis. 
Folia cinereo-viddia, crassiuscula, pelluddo-punctata, mesophyllo centrico, utrinque stomatibus et pilis 
adpressis, paud-cellularibus instructs. Spinae in axillis foliorum singulae, interdum in ramis veteris 
carentes. Flores in axillis foliorum singulae vel paucae, pedicdlatae, 4- vel 5-meres; petals basi angustata; 
stamina libera, numero petalorum quadruple; ovarium^- vel 5-loculare, ovulis in locula binis; stylus brevi- 
usculus, crassus, caducus. Fructus ovalis vel pyxiformis, cortice ut in Citro camosa, glandulis oleiferis 
instructs; pulpa vesicular! adda, vesiculis subglobosis pedicellatis. Semina parva, 5 mm. longa; testa dura 
rugosa; cotyledones hypogaeae; folia primitiva cataphylla. 
Arbuscula vel arbor parva, spinosa. 
Spedes typica et unica, Tripkasia glauca Iyindl. 
