520 



ROSACEAE 



bracts at base; pedicels slender, 1-2 cm. long, glabrous; flowers 

 white, single; calyx glabrous, the teeth deltoid, erect, short- 

 pubescent within; fruiting carpels glabrous or sparingly pilose. 

 Apr .-May. Hokkaido, Honshu (n. distr.) ; rare. 



2. Spiraea prunifolia Sieb. & Zucc. Shijimibana. 

 Shrub; branchlets scarcely angled, short-pubescent; leaves ovate 

 to broadly so, 2-3.5 cm. long, 1.5-2 cm. wide, obtuse to acute, 

 serrulate, appressed-pubescent beneath, the petioles 3-7 mm. 

 long, appressed-pubescent; inflorescence sessile, umbellate, 3- 

 to 5-flowered, with few green bracts at base; pedicels 2-4 cm. 

 long, thinly pubescent; flowers white, double, about 10 mm. 



across. Apr.-May. A Chinese shrub, cultivated in gardens. 



The nomenclatorial type is based upon the double-flowered 



phase in cultivation. Forma simpliciflora Nakai. Hitoe- 



No-SHijiMiBANA. Flowers single. The indigenous wild 



phase of Formosa, Korea, and centr. China. 



3. Spiraea thunbergii Sieb. Yuki-yanagi, Kogomebana. 

 Shrub; branches slender, elongate, arcuate above, slightly 

 angled and short-pubescent while young; leaves linear-lanceo- 

 late, 2-4 cm. long, 3-6 mm. wide, acuminate to acute, acumi- 

 nate at base, with upwardly directed acute teeth, glabrous ex- 

 cept for thin pubescence on midrib while young, the petioles 

 scarcely distinct; inflorescence sessile, 2- to 5-flowered, with few 

 bracts at base; pedicels glabrous, 1-1.5 cm. long; flowers about 

 8 mm. across, single; calyx glabrous, the teeth erect, deltoid; 

 petals broadly obovate, much longer than the stamens; fruit- 

 ing carpels spreading, glabrous. Mar.-Apr. A Chinese 



shrub, widely cultivated and extensively naturalized in Hon- 

 shu (Kanto Distr. and westw.), Shikoku, Kyushu. 



4. Spiraea media F. Schmidt var. sericea (Turcz.) 

 Regel. S. mombetsusensis Franch.; S. media var. monibetsu- 



sensis (Franch.) Cardot; S. sericea Turcz. Ezo-shimo- 



TsuKE. Shrub; branches slightly angled or terete, short-pubes- 

 cent while young; leaves oblong to narrowly so, sometimes 

 elliptic, 2-4 cm. long, 6-20 mm. wide, rounded to subacute 

 at apex, entire or with few teeth on upper margin, silky- 

 pubescent beneath and on margin while young, short-pubes- 

 cent above only while young, often becoming glabrous on both 

 sides, the petioles none or to 2 mm. long; inflorescence soli- 

 tary on short young branchlets from the lateral buds on the 

 previous year's branches, umbellately racemose with a short 

 axis, many-flowered; pedicels 7-15 mm. long; flowers white, 

 about 7 mm. across; calyx-teeth reflexed, rounded to obmse; 

 stamens longer than the petals; fruiting carpels short-pubes- 

 cent, about 2 mm. long. June-July. Hokkaido, Honshu 



(Mutsu Prov.). Kuriles, Sakhahn, Ussuri, Manchuria, and 



Korea. The typical phase occurs from se. Europe to Siberia. 



5. , Spiraea chamaedryfolia L. var. pilosa (Nakai) Hara. 



S. ulmifolia var. pilosa Nakai; S. ussuriensis Pojark. Aizu- 



SHiMoTsuKE. Shrub; young branches angled, glabrous or 

 sparingly short-pubescent; leaves membranous, ovate to nar- 

 rowly so, 3-6 cm. long, 1.5-3.5 cm. wide, acute, acutely dupli- 

 cate-toothed except on lower margin, thinly puberulent with 

 appressed short hairs above while young, more or less pubes- 

 cent beneath, the petioles 3-8 mm. long, slightly pubescent; 

 inflorescence a loosely pubescent umbellate raceme, with short 

 axis; pedicels 10-15 mm. long; flowers many, white, about 10 

 mm. across; calyx-teeth reflexed, subacute; petals orbicular, 

 shorter than the stamens; fruiting carpels connivent, about 3 



mm. long, pubescent, the styles suberect. May. Hokkaido, 



Honshu (centr. distr. and northw.). Sakhalin, n. Korea, 



Manchuria, Amur, Ussuri, and Siberia. The typical phase oc- 

 curs from Europe to Siberia. 



6. Spiraea nipponica Maxim. S. ogatvae Nakai; S. 



bracteata Zabel, non Raf. Iwa-shimotsuke. Shrub; 



branches angled, glabrous; leaves chartaceous, narrowly ob- 

 long to obovate-orbicular, usually elliptic to broadly so, 1-2.5 

 cm. long, 7-15 mm. wide, rounded to very obtuse at apex, 

 entire or with few obtuse teeth on upper margin, glabrous, 

 glaucous beneath, the petioles 1.5-4 mm. long, glabrous; in- 

 florescence terminal on short branchlets, glabrous or nearly so, 

 usually with slightly developed axis, rather many-flowered; 

 pedicels 1-1.5 cm. long; flowers white, 6-7 mm. across; calyx 

 glabrous, the teeth deltoid, erect, acute, brown-pubescent 

 within; petals orbicular, nearly as long as the stamens; fruiting 



carpels more or less brown-pubescent to nearly glabrous. 



May-July. Mountains; Honshu (Kinki Distr. and eastw.). 



Forma rotundifolia Makino, Maruba-iwa-shimotsuke, 



has broader leaves. Forma oblanceolata (Nakai) Ohwi. 



S. nipponica var. oblanceolata Nakai Nagaba-iwa-shimo- 



TsuKE, has narrower leaves. 



Var. tosaensis (Yatabe) Makino. S. tosaensis Yatabe 



TosA-sHiMOTsuKE. Leaves broadly to narrowly oblanceo- 

 late, 1.5-3 cm. long, 3-8 mm. wide, entire or 2- or 3-toothed 

 near the apex. May. Mountains; Shikoku. 



7. Spiraea cantoniensis Lour. Ko-demari. Glabrous 

 shrub; branches rather slender, the young branchlets not 

 angled; leaves lanceolate to narrowly rhombic-oblong, 2-5 cm. 

 long, 6-20 mm. wide, cuneate to obtuse at base, loosely and 

 irregularly incised-serrate, often glaucescent beneath, the 

 nerves and veinlets raised beneath, the petioles 2-10 mm. long; 

 inflorescence rather many-flowered, the axis sometimes slightly 

 developed; pedicels 1-1.5 cm. long, sometimes with filiform 

 bracteoles at base; flowers white, 7-10 mm. across, single; 

 calyx-teeth deltoid, acute; disc short-pilose; fruiting carpels 

 glabrous. Apr.-May. Introduced Chinese shrub long culti- 

 vated in gardens. 



8. Spiraea blumei G. Don. S. kinashii Koidz.; S. ama- 

 bilis Koidz.; S. ribisoidea Koidz.; S. hypoglauca Koidz.; S. 



tsushimensis Nakai; 5. si\ok.ualpina var. glabra Koidz. 



Iwagasa. Glabrous or nearly glabrous shrub, branches 



terete; leaves rhombic-ovate, broadly ovate, oblong or narrowly 

 obovate, 1.5-3.5 cm. long, 1-3 cm. wide, obtuse to subrounded 

 or subacute at apex, broadly cuneate to obtuse at base, irregu- 

 larly toothed or incised except on the lower half, sometimes 

 3-lobed, the lateral nerves slightly impressed above, raised 

 beneath, the petioles 3-10 mm. long; inflorescence umbellate, 

 rather many-flowered; pedicels 10-15 mm. long, slender; 

 flowers white, 6-8 mm. across; calyx-teeth erect, narrowly 

 deltoid, acute; petals orbicular, as long as or slightly shorter 

 than the stamens; fruiting carpels glabrous or slightly hairy 



on ventral side. May. Mountains; Honshu (Kinki Distr. 



and westw.), Shikoku, Kyushu. Very variable. 



Var. pubescens (Koidz.) Ohwi. S. ribisoidea var. pubes- 



cens Koidz.; S. si\o\ualpina Koidz. Iyo-no-mitsuba-iwa- 



gasa. Young branches and inflorescence short-pubescent. 

 Shikoku. 



Var. hayatae (Koidz.) Ohwi. S. hayatae Koidz.; S. 



miyajimensis Makino Urajiro-iwagasa. Leaves gla- 



brous or slightly pubescent beneath; inflorescence, young 

 branchlets, and fruit pubescent. Honshu (Chugoku Distr.). 



9. Spiraea nervosa Fr. & Sav. 5. dasyantha sensu auct. 



