Saxifragaceae 



511 



stamens 15-20, the anthers subglobose; capsules globose, trun- 

 cate at apex. June-July. Woods in mountains; Hokkaido, 



Honshu, Shikoku, Kyushu; rather common. Sakhalin, s. 



Kuriles, and s. Korea. 



2. Hydrangea paniculata Sieb. Nori-utsuci. Erect 

 spreading branched shrub, the branches rather stout, usually 

 scattered-pubescent when young; leaves elliptic, ovate or ob- 

 long, 5-12 cm. long, 3-8 cm. wide, abruptly acuminate, 

 slightly pilose above, paler and sometimes coarsely hirsute on 

 nerves beneath, the petioles 1-3 cm. long; inflorescence rela- 

 tively large, 8-30 cm. long, pyramidal, more or less pubescent, 

 the neutral flowers usually white, sometimes pale rose; calyx- 

 teeth in bisexual flowers deltoid; petals narrowly ovate; anthers 

 depressed-globose; capsules ovoid, 4-5 mm. long inclusive of 

 the short style; seeds 3-4 mm. long inclusive of the tail-like 



wing at the apices. July-Sept. Sunny slopes and open 



woods in mountains; Hokkaido, Honshu, Shikoku, Kyushu; 



common and variable. s. Kuriles, Sakhalin, and China. 



Cv. Crandiflora. H. paniculata forma grandiflora (Sieb.) 

 Ohwi; H. paniculata var. grandiflora Sieb.; H. paniculata var. 



hortensis Maxim. Minazuki. Cultivated phase with all 



or most of the flowers neutral. 



3. Hydrangea sikokiana Maxim. Yahazu-ajisai. 

 Shrub with stout terete branches; leaves broadly ovate, 10-20 

 cm. long, 7-15 cm. wide, sharply serrate, sparingly incised 

 toward the tip, coarsely hirsute on both sides especially on 

 the nerves beneath, and paler beneath, the petioles 5-15 cm. 

 long; inflorescence a rather large cyme, hirsute, with large 

 neutral marginal flowers; calyx-teeth in bisexual flowers short; 

 petals narrowly ovate; anthers globose-cordate; capsules glo- 

 bose, truncate, about 3.5 mm. across; styles 2. July. Hon- 

 shu (w. distr.), Shikoku, Kyushu. 



4. Hydrangea involucrata Sieb. H. cuspidata Makino, 



excl. basionym, non Miq. Tama-ajisai. Coarsely hirsute 



and scabrous shrub with rather stout branches; leaves oblong, 

 elliptic or obovate, sometimes broadly ovate, 10-20 cm. long, 

 5-10 cm. wide, widi short awn-shaped teeth, acuminate, some- 

 times subcordate, coarsely hairy beneath, the petioles 1-8 cm. 

 long; inflorescence rather small, enveloped at first by a few 

 large whitish bracts; petals in bisexual flowers narrowly ovate; 



anthers subglobose; styles 2. July-Sept. Sunny rocky 



places or in open woods in mountains; Honshu (n. and centr. 

 distr.), Shikoku, Kyushu. Cv. Hortensis. H. involu- 

 crata forma hortensis (Maxim.) Ohwi; H. involucrata var. 



hortensis Maxim. Yae-no-cyokudan-ka. Cultivated phase 



with the sterile and bisexual flowers double. 



5. Hydrangea macrophylla (Thunb.) Ser. var. macro- 



phylla AjisAi. Nearly glabrous slighdy fleshy shrub 



with stout branches; leaves lustrous above, broadly elliptic to 

 broadly elliptic-ovate or broadly obovate, 10-15 cm. long, 7-10 

 cm. wide, abrupdy acute to abruptly acuminate, dentate, yel- 

 lowish to fresh-green, sparsely short-pilose on nerves above 

 while young, paler and sparsely short-pilose while young be- 

 neath, the petioles 2-4 cm. long; inflorescence rather large, 

 flat-topped, short-pilose, with neutral flowers on the periphery; 

 calyx-teeth in bisexual flowers small; petals narrowly ovate; 

 anthers globose; capsules ovoid, 6-8 mm. long inclusive of the 



st>'les, enveloped for 2/3 of the length by the calyx-tube. 



June-July. Forma normalis (Wils.) Hara. H. hortensis 



var. azisai (Sieb.) A. Gray; H. azisai Sieb. Inflorescence with 



neutral flowers only on the periphery. Sunny places near 



the sea; Honshu (Sagami and Idzu Prov. inclusive of Idzu 



Isls.) ; sometimes cultivated in gardens. Forma macro- 

 phylla. Viburnum macrophyllum Thunb.; H. macrophylla 

 (Thunb.) Ser.; H. otaksa Sieb. & Zucc; H. macrophylla 



forma otaksa (Sieb.) Wils. Ajisai. The most commonly 



cultivated phase with a large globose inflorescence and most 

 of the flowers neutral. 



Var. megacarpa Ohwi. Mutsu-ajisai. Intermediate 



between the typical phase and var. acuminata, with thin leaves 



and the capsules about 6 mm. long, inclusive of the styles. 



Hokkaido, Honshu (n. distr.). 



Var. acuminata (Sieb. & Zucc.) Makino. H. acuminata 

 Sieb. & Zucc; H. hortensis var. acuminata (Sieb. & Zucc.) A. 

 Gray; Viburnum ctispidatum Thunb.; H. cuspidata (Thunb.) 

 Miq.; H. belzonii Sieb. & Zucc; V. serratum Thunb.; H. ser- 

 rata (Thunb.) Ser.; H. macrophylla subsp. serrata (Thunb.) 

 Makino Yama-ajisai, Sawa-ajisai. Branches more slen- 

 der than in the typical phase, the leaves thinner, lanceolate to 

 elliptic, 5-15 cm. long, 2-10 cm. wide, often caudate, green to 

 vivid green, often loosely hirsute, the nerves short-pilose be- 

 neath, the capsules shorter, 3-4 mm. long inclusive of the 



styles. June-Aug. Mountains; Honshu, Shikoku, Kyushu; 



common and variable. Korea. Culrivars of var. acumi- 

 nata are frequently grown in gardens of which the following 

 are the best known: Cv. Rosalba. H. japonica Sieb. & Zucc; 

 H. japonica rosalba Van Houtte; H. serrata forma rosalba 

 (Van Houtte) Wils.; H. macrophylla forma japonica Ohwi, 



excl. syn. Benigaku. The neutral and bisexual flowers 



deep rose-colored. Cv. Prolifera. H. macrophylla var. 



acuminata forma prolifera (Kegel) Ohwi; H. macrophylla 

 forma stellata (Sieb. & Zucc.) Makino & Nemoto; H. sitsitan 

 Sieb.; H. stellata Sieb. & Zucc; H. hortensia var. stellata (Sieb. 

 & Zucc.) Maxim.; H. stellata forma prolifera Regel; H. serrata 



forma prolifera (Regel) Rehd. Shichidanka. The neutral 



and bisexual flowers double. 



Var. thunbergii (Sieb.) Makino. H. thunbergii Sieb., excl. 



syn. Ama-cha. Closely resembles var. acuminata but 



differs in the sugary taste of the dried leaves, and the calyx- 

 lobes of the neutral flowers usually orbicular. Spontaneous 



in Honshu (centr. distr.); often cultivated. 



Var. angustata (Fr. & Sav.) Hara. H. hortensis var. an- 

 gustata Fr. & Sav.; H. macrophylla var. amagiana Makino; H. 



serrata var. amagiana Makino Amagi-ama-cha. Fresh 



leaves sugary to taste, lanceolate to broadly so, the calyx-lobes 

 in the neutral flowers ovate to ovate-orbicular, obtuse to 

 rounded at the apex. Spontaneous in Honshu (Izu Prov.). 



6. Hydrangea hirta (Thunb.) Sieb. Viburnum hirtum 



Thunb. Ko-ajisai. Small much-branched shrub with 



slender purple-brown branches; leaves thinly membranous, 

 ovate to broadly so or obovate, 4-8 cm. long, 3-5 cm. wide, 

 acute, dentate, the petioles 1-3 cm. long; inflorescence many- 

 flowered, rather compact, without neutral flowers; flowers 

 blue-purple; calyx-teeth small, ovate-deltoid; petals narrowly 

 ovate or narrowly obovate; anthers subglobose; capsules sub- 

 globose, about 3 mm. long inclusive of the persistent styles. 



June-July. Honshu (Kanto and westw.), Shikoku. 



Hydrangea amagiana Makino. Amagi-ko-ajisai. Al- 

 leged hybrid of H. macrophylla X H. scandens. Leaves nar- 

 row, coarsely dentate on upper half. Honshu (sw. Kanto 



Distr.) and Mount Amogi in Izu Prov. 



7. Hydrangea angustipetala Hayata. H. umbellata 

 Rehd. & Wils.; H. l^awagoeana var. grosseserrata (Engl.) 

 Hatus.; H. grosseserrata Engl. Yakushima-ajisai. Gla- 



