518 WILSON EXPEDITION TO CHINA 
This species is locally very common, forming dense dwarf thickets. The leaves 
vary from obovate to lanceolate or lanceolate-ovate, from shining to dull green 
above, and are densely or sparsely lepidote. 
Rhododendron ambiguum Hemsley in Bot. Mag. CXXXVII. t. 
8400 (1911). — Schneider, IU. Handb. Laubholzk. II. 1043, fig. 615 a-c 
(1912). 
Western Szech'uan: south-east of Tachien-lu, on rocks in woods, 
alt. 3000-3300 m., June and October 1908 (Nos. 1324, 1324, 1324°; 
bush 1-2 m. tall, flowers yellow); Mupin, woodlands, alt. 2600-3000 
m., June and October 1908 (No. 1324°; bush 1-2 m. tall, flowers 
yellow) ; south-east of Tachien-lu, woods, alt. 3000-3300 m., June and 
October 1908 (Nos. 1330, 1330*; bush 1-2.5 m. tall, flowers yellow); 
Tachien-lu, thickets, alt. 2600-3300 m., October 1910 (No. 4240; 
bush 1-3 m. tall); Mt. Omei, thickets, alt. 2300-3000 m., October 1910 
(No. 4252; bush 2.5-4 m. tall); Mupin, thickets, alt. 2300-2800 m., 
October 1910 (No. 4265; bush 2-3 m. tall); without precise locality, 
alt. 2600-3300 m., May 1904 (Veitch Exped. No. 3943); Mt. Omei, 
June 1904 (Veitch Exped. No. 5144); near Tachien-lu, alt. 3000-4500 
m., A. S. Pratt (No. 848). 
The undescribed fruit of this species is cylindrical, 1-1.5 cm. long, 4-5 mm. wide, 
furrowed, often slightly curved, lepidote. 
This yellow flowered species is very abundant in thickets and rocky, exposed 
places throughout the regions mentioned above. Apart from the color of the flowers 
there is very little to distinguish it from R. yanthinum Bureau & Franchet, which 
has, however, leaves usually more brownish below and slightly more slender fruits. 
Hemsley & Wilson (Kew Bull. Misc. Inform. 1910, 115) refer Pratt’s No. 848 
to R. concinnum Hemsley, but the flowers are obviously yellow in color. 
Group b. 
Leaves only lepidote. Flowers purple. 
Rhododendron yanthinum Bureau & Franchet in Jour. de Bot. V. 94 
(1891). 
Rhododendron Benthamianum Hemsley in Kew Bull. Misc. Inform. oe 
319; in Gard. Chron. ser. 3, XLVII. 4 (1910). — Hemsley & Wilson in te 
Bull. Misc. Inform. 1910, 115. 10, 
Rhododendron concinnum Hemsley & Wilson in Kew Bull. Misc. Inform. 19 
115 (non Hemsley). 
Rhododendron atroviride Dunn in Jour. Linn. Soc. XXXIX. 484 (1911). 
Western Szech'uan: Mupin, alt. 2000-2300 m., June and Oc- 
tober 1908 (No. 1196; bush 1-2.5 m. tall, flowers purple); same lo- 
cality, thickets, alt. 1600-2500 m. (No. 3447; bush 1-2 m. tall, flowers 
