ERICACEAE. — RHODODENDRON 513 
Western Szech’uan: north of Tachien-lu, moorlands, alt. 3600- 
4000 m., July 7, 1908 and September 1908 (No. 1202; bush 1-2 m. 
tall, flowers pale yellow); without precise locality, alt. 3600-4300 m., 
June 1904 (Veitch Exped. No. 3932 and seed No. 1773). 
Common in alpine regions around Tachien-lu. The flowers vary from pale 
primrose-yellow to clear yellow; the calyx varies in size, and the degree of pubes- 
cence on the style and stamens is also variable. 
Rhododendron flavidum, var. psilostylum Rehder & Wilson, n. var. 
A typo recedit foliis latioribus obscure viridibus saepius ovalibus, 
calyce minore, corolla extus sparsissime lepidota, stylo glabro, cap- 
sula minore, 5-6 mm. longo. 
Western Szech'uan: west of Kuan Hsien, summit of Niu-tou- 
shan, on rocks exposed to sun, alt. 3300 m., June 20, 1908 (No. 3452). 
This variety differs from the type in its duller green leaves, lepidote flowers 
smaller calyx, glabrous style, smaller and more globose fruit. Notwithstanding 
these marked differences we cannot consider it other than as a variety of R. flavi- 
dum Franchet. 
Group e. 
Stamens exceeding the corolla; flowers small, white, on slender pedicels in many- 
flowered, dense racemes. Leaves acute, 2-3 em. long, glabrous or nearly so above, 
Sparingly lepidote beneath. 
Rhododendron micranthum Turczaninow in Bull. Soc. Nat. Mosc. 
1837, No. VII. 155. — De Candolle, Prodr. VII. 727 (1838). — Ture- 
zaninow, Fl. Baical. Dahur. II. Pt. 2, 208 (1856).— Maximowiez 
in Mém. Acad. Sci. St. Pétersbourg, sér. 7, XVI. No. IX. 18, t. 4, fig. 1- 
10 (1870). — Franchet in Nouv. Arch. Mus. Paris, sér. 2, VI. 77 (Pl. 
David. I. 197) (1883). — Hemsley in Jour. Linn. Soc. XXVI. 27 
(1889). — Chipp in Bot. Mag. CXXIV. t. 8198 (1908). — Schneider, 
Ill Handb. Laubholzk. II. 475, fig. 316 g. (1909).— Hemsley & 
Wilson in Kew Bull. Misc. Inform. 1910, 117. — Pampanini in Nuov. 
Giorn. Bot. Ital. n. ser. XVII. 683 (1910). 
Rhododendron Rosthornii Diels in Bot. Jahrb. XXIX. 509 (1900). 
Rhododendron Pritzelianum Diels in Bot. Jahrb. XXIX. 510 (1900). 
Western Hupeh: Hsing-shan Hsien, cliffs, alt. 1600-2000 m., 
June and November 1907 (No. 660; bush 1.5-2 m. tall, flowers white) ; 
Without locality, May 1900 (Veiteh Exped. No. 1526); Mt. Triora, 
tember 1907, C. Silvestri (No.1703). Western Szech'uan: west 
and near Wén-ch'uan Hsien, thickets, alt. 2000-2600 m., July and 
October 1908 (No. 1200; bush 1-2 m. tall, flowers white) ; same locality, 
