1923] WILSON, THE HORTENSIAS 243 



leaves and in degree of hairiness; the sterile flowers may be blue, white or 

 pinkish and the shape of the petaloid sepals varies from nearly round to 

 lance-shape and either rounded blunt or pointed. It is a hardy plant and 

 I have seen it flourishing in the Botanic Garden in Sapporo, Hokkaido. 

 In this Arboretum it has flowered many times but the plant does not 

 thrive. It has several Japanese names such as Hosoba-amacha, Yama- 

 ajisai and Sawa-ajisai but the one I heard most usually applied to this 

 plant is Yama-ajisai which may be interpreted Mountain Hydrangea. 



As they grow wild no two species could be more distinct than the littoral 

 H. macrophylla var. normalis Wils. and the woodland 77. serrata DC, but 

 in herbaria it is not easy to distinguish between dried specimens of the 

 extreme forms of each and this has had much to do with the hopeless 

 confusion between them which obtains in books. The relatively thick, 

 fleshy, shining green leaves of the former and the thin, dull dark green 

 leaves of 77. serrata readily distinguish the species. The woodland plant 

 is in every way a less vigorous plant than its relative of the seashore 

 whose leaves are usually broadest above the middle and rarely so in the 

 woodland species. From Siebold all authors have recognized under various 

 names these two species as distinct and those familiar with the living 

 plants have never hesitated in the matter but the forms of the dull green 

 membranous-leafed species have been confused under //. macrophylla. 

 The synonymy shows this very clearly and perhaps is more expressive 

 than any lengthy explanation could possibly be. 



In Thunberg's Herbarium the three specimens named Viburnum ser- 



ratum y, 8, and s are the type of the species. 

 A form with large leaves is: 



Hydrangea serrata f. acuminata Wilson, n. comb. 



H. acuminata Siebold & Zuccarini, Fl. Jap. I. 110, tt. 56, 57, fig. 1 (1840). 

 CarriJre in Rev. Hort. 1874, 91, t— Bean, Trees & Shrubs Brit. Isl. i. 625 



(1914). 

 H. Buergeri Siebold & Zuccarini, Fl. Jap. I. Ill, t. 57, fig. 2 (1840). 

 H. Hortensia a. acuminata Maximowiczii in M6m. Acad. Sci. St. P6tersb., 



s£r. 7, x. no. xvi. 13 (Rev. Hydrang. As. Or.) (1867), not A. Gray in Sched. 



PI. Wright —Hemsley in Garden x. 265 (1876). 

 H. Hortensis a. acuminata Franchet & Savatier, Enum. PI. Jap. i. 150 (1875). 



Rehder in Bailey, Cycl. Am. Hort. n. 785 (1900). 

 H. opuloides var. acuminata Dieck, Haupt-Cat. Zoeschen, 42 (1885).— Dippel, 



Handb. Laubholzk. in. 323 (1893).— Schneider, 111. Handb. Laubholzk. I. 



391, fig. 250 o-t (1905).— Rehder in Bailey, Stand. Cycl. Hort. ill. 1621 



(1915). N . 



H. opuloides var. angustata Matsumura, Ind. PI. Jap. n. pt. 2, 179 (1912), in 



part, vix Franchet & Savatier. 

 H. opuloides var. acuminata f. Bdrgeri Purpus in Moeller's Deutsch. Gartn.- 



Zeit. xxxii. 41, fig. (1917). 

 Japan. Kyushu: Tsu-shima Island, C. Wilford, 1859 (Herb. Gray), 

 prov. Satsuma, Mt. Kirishima, alt. 100-1000 m., Z. Tashiro, June 24, July 29, 1917; 

 prov. Osumi, Nishi-kirishima, E. H. Wilson, No. 6244, March 3, 1914. Hondo : 

 prov. Uzen, Adzuma-san, alt. 600-11000 m., E. H. Wilson, No. 7212, July 19, 

 1914; prov. Ugo, Chokai-san, E. H. Wilson, No. 7173, October 14, 1914; prov. 



