92 JOURNAL OF THE ARNOLD ARBORETUM [vol. v 



This is well-distinguished from other Hupeh species by the white 

 crustaceous covering on the under surface of the leaves. It is a very 

 common species in western Hupeh between 4500 and 7000 ft. altitude and 

 it grows in eastern Szechuan where it was found by Pere P. Farges round 

 Tchen-keou-ting in the northeast and by A. von Rosthorn near Nan- 

 ch'uan Hsien in the southeast. Though it skirts it does not cross the 

 Red Basin but is represented in western Szechuan by the closely related 

 R. argyrophyllum Franchet. In many places R. hypoglaucum is very abund- 

 ant, scattered through thin woods or at its altitudinal limits growing in 

 open country among rocks. It is a much-branched plant of good habit 

 sometimes 20 ft. tall and as much in diameter and is very floriferous with 

 rather small flowers in a compact truss. Both white and pink-flowered 

 forms grow wild being in fact equally common. The flowers open in May, 

 are broader than deep and the corolla is narrowed abruptly to the base. 

 The ovary and flower-stalks vary from glabrous to pubescent and glandular 

 and the latter vary considerably in length. 



This Rhododendron was first discovered in 1886 by A. Henry in the 

 district of Patung and introduced into cultivation by seeds (No. 752) 

 which I sent to Messrs. Veitch in the autumn of 1900. It first flowered 

 under cultivation at Caerhays Castle in May, 1915, and was figured in 

 the Botanical Magazine though the drawing is not very accurate. In a 

 wild state the plants bloom from near the end of April until the end of 

 May according to altitude. 



The color of Hemsley's type is not given but for convenience's sake the 

 form with white flowers may be distinguished as: 



Rhododendron hypoglaucum f. album Wilson, n. forma. 



Rhododendron adenopodum Franchet in Jour, de Bot. ix. 391 

 (1895).— Bean in Gard. Chron. ser. 3, xlv. 291, fig. 125 (1909); in Kew 



Bull. Misc. Inform. 1914, 382; Trees & Shrubs Brit ... x ,. 



Millais, Rhodod. 110 (1917).— J. C. Williams in Rhod.' Soc. Not. 1.132 

 (1917).— Balfour f. in Rhod. Soc. Not. I. 148 (1917). 



Bush from 1 to 4 m. tall with branches the first year more or less 



sparsely clothed with pale gray appressed tomentum through which are 



scattered glistening lepidote glands; winterbuds viscid, the lower bud- 

 scales lanceolate and woolly. Leaves oblong-oblanceolate to oblong, 

 without petiole 8-20 cm. long, 2-5 cm. wide, apex acute and mucronate; 

 base usually narrowed, glabrous, shining green above, under surface 

 densely covered with close, felted, gray to dun-colored tomentum; petiole 

 stout, 1.5-2.5 cm. long, floccose, often glandular. Flowers 6 to 10 or 

 more in an umbellate raceme; rhachis 2-3.5 cm. long; pedicels 2-4 cm. long, 

 erect-spreading, densely stipitately glandular; calyx membranous, per- 

 sistent, reflexed, lobes lanceolate to ovate, about 5 mm. long, acute vil- 

 ose and glandular without; corolla 5-lobed, pink, broad-funnelform, 4-6.5 

 cm. long and broad, the posterior part within spotted with maroon , slightly 



