Acer in Formosa — Li 
289 
Kanehira (1936: 506, fig. 361) [non 
Wall.]. 
Acer lanceolatum sensu Rehder (1905: 180) 
p. p. [non Molliardj. 
An evergreen tree to 15 cm. high; branch - 
lets pubescent at first, soon glabrous. Leaves 
persistent, coriaceous, oblong-lanceolate, 6- 
13 cm. long, 2.5-5 cm. broad, caudate to 
acuminate at apex, obtuse to cuneate at base, 
pale green and glabrous above, 'white-purplish- 
glaucous beneath, densely pubescent when 
young, weakly 3-nerved at base, the basal 
nerves short, slightly raised or indistinct, the 
lateral nerves 7-10 per side, slightly raised, 
divergent at right angles; petioles 1.5-3 cm. 
long, glaucous. Infructescence cymose; nut- 
lets glabrous, about 3 mm. across; wings 
with nutlets about 2 mm. long, spreading at 
obtuse angles. 
Endemic to Formosa; in forests from me- 
dium to low altitudes throughout the island. 
Formosa: South Cape, A. Henry 1257 (US); 
Musha, Nanto Prov., E. H. Wilson 10082 
(US) ; Kizan-gun, Takao-syu, Y. Yamamoto 
& K. Mori 808 (NTU). 
The concept of A. ohlongum Wall, in eastern 
Asia has been considerably modified in recent 
years. The species is now considered as oc- 
curring only in northeastern India and western 
China, and other plants of this immediate 
relationship from eastern and southern China 
are considered to represent distinct species 
by recent aui;hors, perhaps too many such 
species being recognized. Hayata earlier es- 
tablished three species of this group in For- 
mosa, namely A. albopurpurascens, A. litseae- 
folium, and A. hypoleucum, but later workers 
on the Formosan flora, including Kanehira 
(1936) arid Sasaki (1930: 325), consider them 
as a single species, to which they refer as 
A. ohlongum Wall. Metcalf (1932: 198) and 
Fang (1939: 145-163) maintain all three as 
distinct. The Formosan plant, under the cur- 
rent concept, should be specifically distin- 
guished from A. ohlongum especially because 
of the weak or indistinct basal nerves. But 
probably only one species is present on the 
island; the identity of A. hypoleucum is some- 
what uncertain. 
A plant from the Liukiu Islands, consid- 
ered as a variety of A. ohlongum, has distinct 
morphological characters and an outlying 
range. It should be treated as a separate 
species. 
2. Acer itoanum (Hay.) comb. nov. 
Acer ohlongum Wall. var. itoanum Hay. 
(1911: 67); Metcalf (1932: 196); Fang 
(1939: 138). 
Acer ohlongum var. microcarpum sensu Ito 
ex Ito & Matsum. (1898: 387) [non 
Hieronymus]. 
Acer ohlongum sensu Koidz. (1911^: 55, 
pi. 29) p. p. 
Tree to 13 m.; branchlets glabrous, the 
young ones reddish, the older grayish. Leaves 
thin-coriaceous, glabrous, ovate to broadly 
ovate, 4. 5-6. 5 cm. long, 2-4.5 cm. broad, 
abruptly acuminate at apex, rounded to cor- 
date at base, entire at margins, usually un- 
divided, rarely indistinctly and obtusely 
3-lobed, green above, glaucous beneath, 
distinctly 3-nerved at base, the veins distinct 
on both surfaces, the basal nerves long and 
strongly ascending, the lateral nerves 3-5 per 
side, the veinlets densely reticulate, elevated 
and distinct on both surfaces; petioles slender, 
to 2.5 cm. long, glabrous. Flowers unknown. 
Infructescence terminal, corymbose, pubes- 
cent; peduncles about 1 cm. long; pedicels 
to 1 cm. long, slender, pubescent. Fruit 
brownish yellow; nutlets convex, 5-6 mm. 
long, 3-4 mm. broad; wings oblong, with 
nutlets about 1.5-2 cm. long, 5 mm. broad, 
spreading at about 45-90°. 
Endemic to the Liukiu Islands. 
Liukiu Islands: Okinawa, W. D. Field & 
0. G. Loew 4 (US); Shuri, E. H. Wilson 8172 
(US), C. Wright 40 (US). 
This species differs from A. ohlongum Wall, 
in the small, short, ovate leaves, which are 
abruptly acuminate at apex and distinctly 
