ROSACEAE 



541 



C. A. Mey.; R. rugosa var. jerox (Lawrance) C. A. Mey. 



Hama-nasu. Erect bushy shrub with stout densely short- 

 pubescent branches with needlclike slender spines and stout 

 flattened short-pubescent prickles; stipules broad, membranous, 

 the free portion broadly ovate or deltoid; leaflets 7-9, nearly 

 equal, oblong, elliptic or obovate, 3-5 cm. long, 2-3 cm. wide, 

 obtuse to rounded, glabrous and minutely bullate or rugulose 

 above, densely cinereous hairy and with sessile pale glandular 

 dots; flowers 1-3, terminal, 6-10 cm. across, deep rose, the 

 pedicels stout, erect, 1-3 cm. long, with slender prickles; calyx 

 with a depressed-globose tube, the lobes 3-4 cm. long, ap- 

 prcssed-pubescent and with slender prickles, sometimes with 

 short stipitate glands; fruit subglobose, yellowish red, 2-2.5 



cm. across. June-Aug. Sandy shores; Hokkaido, Honshu 



on Pacific side south to n. Kanto and on Japan Sea side south 



to San'in Distr.). Temperate and northern parts of e. Asia 



to the Kuriles, Kamchatka, and Sakhalin. 



Rosa X iwara Sieb. R. yesoensis (Fr. & Sav.) Makino; R. 



iwara var. yesoensis Fr. & Sav. Ko-hama-nasu. Natural 



hybrid of No. 5 and No. 1, differing from No. 5 in the less 

 prominently rugose upper leaf-surfaces, and with smaller flow- 

 ers 3-4 cm. across. Occurs rarely along seashores in Hok- 

 kaido and n. Honshu. 



6. Rosa davurica Pall. R. willdenowii Spreng.; R. cin- 

 namomea var. davurica (Pall.) C. A. Mey.; R. marretii Lev.; 



R. rubrostipulata Nakai Yama-hama-nasu, Karafuto- 



iBARA. Shrub with glabrous branches becoming purplish 

 brown with age, the prickles flat, supular; stipules membra- 

 nous, brownish, entire, the free portion oblong or ovate, 

 rounded, rarely acute or mucronate; leaflets 7-9, oblong, 2-3 

 cm. long, 1-1.5 cm. wide, subacute to obtuse, slightly appressed- 

 pubescent to glabrous on upper side, whitish, glandular, and 

 with appressed pubescence especially on midrib beneath; flow- 

 ers 1-3, deep pink, 3-4 cm. across, with glabrous pedicels; 

 calyx with a globose, glabrous tube, the lobes elongate, with 

 white tomentum inside and on margin; fruit globose or ellip- 

 soidal, about 12 mm. across, red. June-July. Hokkaido, 



Honshu (Shinano Prov.); rare. Sakhalin and Korea to 



Manchuria and e. Siberia. 



7. Rosa acicularis Lindl. R. jauriei Lev., pro parte; R. 

 gmelinii Bunge; R. acicularis var. gmelinii (Bunge) C. A. 



Mey.; R. acicularis var. taquetii Nakai O-takanf.-ibara. 



Shrub with reddish brown, glabrous, elongate branches and 

 needlelike slender prickles; stipules membranous, entire, glan- 

 dular on margin, the free portion lanceolate to ovate, acute to 

 acuminate; leaflets 5-7, membranous, oblong or ovate-oblong, 

 2-A cm. long, acute to acuminate, vivid green, glabrous on up- 

 per side, slightly whitish and with appressed-pubcscence on 

 midrib beneath, the peuoles sometimes glandular-pilose; flow- 

 ers solitary, pink, 3-4 cm. across, the pedicels glandular-pilose, 

 3-5 cm. long; calyx with glabrous tube, the lobes elongate 

 above, white-tomentose inside and on margin, sometimes 

 glandular-pilose outside; fruit fusiform, 2-3 cm. long, 7-10 

 mm. across. June-July. High mountains; Hokkaido, Hon- 

 shu (n. and centr. distr.). Siberia, Kamchatka, Sakhalin, 



Korea, and N. America (var.) . 



Var. nipponensis (Crep.) Koehne. R. nipponensis Crep.; 



R. acicularis var. glauca Fr. & Sav., non Kegel Takane- 



ibara. Stipules broader, the free portion elliptic-ovate, often 

 obtuse; leaflets 7-9, obtuse to rounded, 1-3 cm. long, 8-15 mm. 

 wide, with minute acute teeth; pedicels with rather long 

 glandular hairs; fruit obovoid. June-July. High moun- 

 tains; Honshu (centr. distr. and Oze), Shikoku. 



8. Rosa hirtula (Kegel) Nakai. R. microphylla var. 

 hirtula Kegel; R. roxburghii var. hirtula (Kegel) Kehd. & Wils. 

 Sansho-ibara. Large, much-branched shrub with much- 

 flattened stipular prickles; sdpules entire, glandular on mar- 

 gin, the free portion linear-lanceolate; leaflets 9-19, ovate- 

 oblong or oblong, 10-25 mm. long, 5-15 mm. wide, acute, 

 serrulate with short-awned acute teeth, nearly glabrous on 

 upper side, paler and prominently pubescent especially on mid- 

 rib beneath, the petioles and rachis short-pubescent; flowers 

 solitary, terminal, pale pinkish, 5-6 cm. across, the pedicels 

 stout, short, with needlelike prickles; calyx with densely 

 prickly mbe, the lobes broadly elliptic, often with a small 



appendage near base; fruit globose, about 2 cm. across. 



June. Honshu (Sagami, Kai, and Suruga Prov.). 



20. PRUNUS L. Sakura Zoku 



Deciduous or evergreen trees and shrubs; leaves alternate, simple, toothed, conduplicate or convolute in bud; flowers solitary, 

 in fasciculate corymbs or in racemes, white or pink; calyx deciduous, rarely persistent, the tube (hypanthium) tubular to 

 obconical, the lobes 5, imbricate in bud; petals 5, inserted on the throat of the calyx-tube; stamens 15 to many, inserted on the 

 throat of the calyx-tube, the filaments free; carpels solitary, the style terminal, the ovules 2, collateral; drupe fleshy, the endo- 



carp a smooth or rugose, 1-seeded stone. About 200 species, in the temperate and cooler regions of the N. Hemisphere and 



in the Tropics of Asia and America. 



1 A. Inflorescence a fascicle, corymb, or few-flowered short raceme; calyx-lobes deciduous after anthcsis. 

 2A. Drupes shallowly sulcatc; flowers sessile or nearly so (except No. 1). 



3A. Terminal bud not developed; lateral bud solitary; leaves convolute in bud. 



4.\. Flowers pedicelled, usually in 3's; ovary and fruit glabrous 1. P. salicina 



48. Flowers nearly sessile; ovary and fruit usually hairy. 



5A. Leaves broadly ovate-orbicular, 4-7 cm. wide; petioles 20-35 mm. long; flowers very short-pcdiccllcd 2. P. ansu 



5B. Leaves obovate or elliptic, 3-5 cm. wide; petioles 1-2 cm. long; flowers nearly sessile i. P. mume 



3B. Terminal bud present; lateral buds in 3's, the central one bearing 1 or 2 sessile flowers; drupe usually hairy; leaves conduplicate 



in bud 4. P. persica 



2B. Drupes not sulcate; flowers usually distinctly pedicelled. 

 6A. Buds in 3's. 



7A. Leaves prominently pubescent; flowers sessile 5. P. tomenlosa 



7B. Leaves glabrous or loosely short-pubescent; flowers pedicelled. 



8.-\. Leaves ovate, sometimes ovate-lanceolate, acuminate, acutely duplicate-toothed; petioles 2-3 mm. long; fruit dark red- 

 purple, with a depressed base 6. P. japonica 



8B. Leaves lanceolate to ovatc-oblong, acute, obtusely serrulate; petioles 4-6 mm. long; fruit not depressed at base, red. 



7. P. glandulosa 



