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PACIFIC SCIENCE, Vol. VI, October, 1952 
rounded to cordate at base, as well as in the 
smaller fruits with pubescent pedicels. The 
wings of the fruit are oblong rather than 
ovate in shape. Among the specimens cited. 
Field & Loew 4 has the leaves mostly broader 
and more distinctly cordate, with a few having 
a tendency toward being indistinctly 3-lobed. 
The illustration given by Koidzumi, showing 
leaves with round to cordate bases, evidently 
refers to the Liukiu plant. 
3. Acer hypoleucum Hay. (1913: 66, pi. 14, 
c). 
Small tree; branchlets slender, tomentose 
at first, soon glaucous. Leaves persistent, 
chartaceous to coriaceous, oblong or elliptic- 
oblong, about 8 cm. long, 3.5-4 cm. broad, 
obtuse or acutish at apex, rounded or obtuse 
at base, entire or slightly undulate at margins, 
green above, whitish-glaucescent and densely 
tomentose beneath, slightly 3-nerved at base, 
the nerves raised and more or less distinct, 
the lateral nerves 5 or 6 per side; petioles 
2-3 cm. long, slender, tomentose. Infruc- 
tescence cymose, terminal; nutlets convex, 
about 5 mm. across; wings with nutlets about 
17 mm. long and 6 mm. broad, spreading at 
nearly right angles; pedicels 1.5 cm. long, 
slender, pubescent. 
Endemic to Formosa; no specimen seen. 
Acer hypoleucum is described as being pubes- 
cent on the lower surface of the leaves. It is 
thus maintained as distinct from A. albopur- 
purascens by Metcalf and Fang; the latter has 
seen the type. However, Kanehira relegates 
it, together with A. albopurpurascens, to the 
synonymy of A. oblongum (sensu Kanehira 
non Wall.). In A. albopurpurascens, the young 
leaves are densely pubescent, as shown in 
Wilson 10082. The presence or absence of 
these hairs may be due to variation in age 
and environment. Further studies are needed 
to ascertain the identity of A. hypoleucum. 
4. Acer buergerianum Miquel var. formosa- 
num (Hay.) Sasaki (1928: 275); Fang 
(1939: 128). 
Acer trifidum Hook. & Arn. var. formosa- 
num Hay. exLeveille (1906: 593); Koidz. 
(1911^: 30, pi. 17, 8-9); Kanehira (1936: 
409, fig. 364). 
Tree to 10 m. high; branchlets glabrescent. 
Leaves deciduous, membranaceous, ovate to 
elliptic, 8-10 cm. long, 4-6 cm. broad, round- 
ed or slightly cordate at base, entire or 
shallowly 3-lobed near apex, 3-nerved at base, 
the reticulations conspicuous; petioles 2.5-5 
cm. long. Inflorescence corymbose. Fruits 
yellowish brown; nutlets strongly convex, 
about 6 mm. across; wings falcate, with nut- 
lets 2.5-3 cm. long, 8-10 mm. broad, spread- 
ing horizontally. 
Formosa: Huki-kaku, T. Kawakami, May 
1915 (NTU). 
The species occurs in southeastern China, 
the variety is endemic to the coast of northern 
Formosa, in forests. Fang maintains the varie- 
ety on the basis of the type specimen, which 
he examined. 
5. Acer kawakamii Koidz. (191 1*^: [102] 
[March]; 1911^: 15, pi. 5 [Aug.]); Kane- 
hira (1936: 402, fig. 360). 
Acer caudatifolium Hay. (1911: 65 [June]). 
Acer morrisonense Hay. (1911: 66, ex Koidz. 
1911^: 16, pi. 7). 
Acer ovatifolium Koidz. (1911^: [102]); 
(191H: 16, pi. 6). 
Acer caudatum sensu Matsum. & Hay. 
(1906: 96) [non Wall.]. 
A tree to 20 m. high; branchlets slender, 
glabrous. Leaves deciduous, chartaceous, 
ovate to ovate-oblong, 6-10 cm. long, 3-5 cm. 
broad, caudate-acuminate at apex, rounded 
or slightly cordate at base, serrate and some- 
times shallowly 3- or rarely 5-lobed at mar- 
gins, 5 -nerved at base, the lateral nerves 7 or 
8 per side, green above, pale green beneath, 
slightly pubescent on nerves at first, soon 
glabrous; petioles 3-4 cm. long, rosy, slender, 
glabrous. Flowers in glabrous or slightly 
pubescent racemes about 5 cm. long; sepals 
5, emarginate, 2-2.5 mm. long; petals 5, 
