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10. CITRUS Linn. 
1. C. hystrix DC.; Hook. f. FI. Brit. Ind. 1 (1875) 515. 
(2312, 2760 Meyer) December, February; (6828 Elmer) November; (1301, 
1545, 2736 Borden) July, March; (517 Whitford) July. In forests 100 to 
1,000 m., widely distributed in the Philippines. British India, Malaya. T., 
Gabuyao. 
SIMARUBACE.^^. 
1. BRUCEA J. S. Muell. 
1. B. luzoniensis Vidal, Sinopsis, Atlas (1883) 19. t. 26. f. B. 
(181, 480 Whitford) May, July; (6786 Elmer) November; (6165 Leiberg) 
July; (1760, 2750 Borden) August, March; (2608 Meyer) February. In forests 
100 to 800 m. Endemic. 
2. B. membranacea Merrill, n. sp. 
A shrub or small tree 5 to 6 in. high, with 3 to 4 jugate, odd pinnate leaves 
about 20 cm. long, the leaflets nearly glabrous, membranous, subentire or rather 
distantly toothed above, the inflorescence axillary, 10 cm. long or less. Branches 
light gray, lenticellate, ferruginous pubescent, the younger ones densely so. 
Leaves alternate, the rhachis more or less ferruginous pubescent; leaflets ovate 
to oblong-ovate, base slightly inequilateral, rounded or acute, the ape.x shortly blunt 
acuminate, 4 to 6 cm. long, 2 to 3 cm. wide, the midrib above and the midrib 
and nerves beneath ferruginous pubescent, otherwise glabrous ; nerves about 7 
pairs; petiolules densely pubescent, 3 to 4 mm. long. Inflorescence densely ferru- 
ginous pubescent, axillary, the flowers green, disposed in very small, few flowered 
cymes along the rhachis, these cjmies 1 cm. long or less, rarely more than three 
flowered. Sepals slightly pubescent. Petals ovate to elliptical ovate, not reflexed, 
1.5 mm. long, glabrous. Ovary glabrous. Staminate flowers similar to the pistil- 
late, the stamens very short, not exserted, scarcely exceeding the disk. 
(2799, 2800 Meyer) March, 1905. On exposed ridges at 1,000 m. 
This species agrees in some respects w'ith Vidal’s description of Brucea luzon- 
iensis, differing from that species as described by Vidal in its broader, not relle.xed 
petals, very short stamens, and smaller leaves and leaflets, agreeing with his 
description in its short inflorescence. The specimens above referred to Brucea 
luzoniensis all have very much elongated panicles. 
2. AILANTHUS Desf. 
1. A. philippinensis Merr. Govt. Lab. Publ. 35 (1905) 25. 
(2719 Borden) February. In forests at 150 m. Endemic. 
BURSEKACEiE. 
1. CANARIUM Linn. 
1. C. ahernianum Merrill, n. sp. 
A tree 20 to 25 m. high. Branches thickened, densely ferruginous pubescent 
with short hairs, the ultimate branchlets often 1 cm. or more in diameter, 
the leaf scars large and prominent. Leaves crowded toward the ends of the 
branchlets, 30 to 40 cm. long, 5 to 6 jugate, the rhachis rather densely ferruginous 
pubescent, becoming somewhat glabrous in age; leaflets oblong, entire, acuminate, 
the base roxmded, often inequilateral, 10 to 14 cm. long, 4 to 6.5 cm. wide, firm, 
xisually shining on both surfaces, often pale when dry, densely ferruginous pub- 
escent on the midrib above and often somewhat pubescent on the nerves and 
reticulations, becoming subglabrous, beneath prominently pubescent on the midrib 
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