ROSACEAE 531 



lOB. Leaves not glaucous, green or pale green beneath. 



1 1 A. Flowers few, on short pedicels; bud-scales persistent 10. R. cratiiegijoliiis 



IIB. Flowers solitary, if more than 1 then borne together on slender pedicels; bud-scales usually deciduous. 



12A. Petals 4-6 mm. long; branches and other parts nearly always unarmed; leaves deeply palmately parted; pedicels long 



and slender II. R. pscudoacer 



12B. Petals 10-25 mm. long; plants usually prickly. 



13A. Calyx glabrous or nearly glabrous outside, the segments rather thick, densely white-villous inside and on margin; 



leaves undivided or shallowly 3-lobed 12. R. grayaniis 



13B. Calyx pubescent or the segments nearly glabrous on both sides, usually membranous. 



HA. Flowers 3-7, erect; young branchlets and pedicels with stipitate glands; leaves palmately cleft to lobed. 



13. R. trifidus 

 HB. Flowers 1, rarely 2, nodding or pendulous. 



15A. Fertile branchlets and petioles not at all or scarcely prickly. 



I6A. Leaves suborbicular, palmately 5-(3-7)-parted H. iJ. c/iingii 



16B. Leaves broadly to narrowly ovate, 3-lobed or undivided, very rarely 5-lobed, the outermost lobes very small. 



17A. Young branches and underside of leaves with short spreading pubescence 15. i?. ribesoideus 



17B. Young branches and underside of leaves with appressed to ascending pubescence 16. R. ohsimensis 



15B. Fertile branchlets and petioles with distinct prickles; flowers solitary on short pedicels. 



ISA. Leaves beneath densely covered with appressed and spreading hairs; fertile branches with undivided leaves. 



17. R. corchorijolius 

 18B. Leaves nearly glabrous or with only a few appressed hairs on nerves beneath; fertile branchlets with undivided 



or 3- to 5-cleft leaves 18. R. palmatus 



IB. Leaves 3- to many-foliolate. 



19A. Shrubs with woody branches; leaves ternate or pinnate, the leaflets 3 to many. 

 20A. Flowers solitary or few, large; petals orbicular or ovate-orbicular, 10-20 mm. long. 



21A. Flowers deep reddish, nodding; petals ascending; plants unarmed 19. /?. vernus 



2 IB. Flowers white, with spreading petals. 



22A. Leaves ternate, the leaflets sessile or nearly so 20. R. nishimiiranus 



22B. Leaves pinnate, the leaflets 3 to many, if 3, the terminal one distinctly petioluled. 



23A. Carpophore .short but distinct; petals ovate-orbicular; fruitlets small, many; calyx without prickles. 

 24A. Plants usually glandular; branches terete. 



25A. Underside of leaves and calyx-tube with sessile discoid yellowish glands 21. R. mintisculus 



25B. Plants without sessile discoid glands; pedicels and other parts with stipitate glands (glandular hairs). 



26A. Glandular hairs 3-5 mm. long 22. R. sorbijolius 



26B. Glandular hairs 0.2-2 mm. long. 



27A. Plants with glandular hairs only 23. R. croceacanthus 



TJ^. Plants with glandular hairs and prominent eglandular pubescence 24. R. hirsutus 



24B. Plants without glands; branches obtusely angled. 



28A. Fertile branches rising directly from the underground rhizomes; leaflets usually 5-7, rarely 3; flowers single; indig- 

 enous 25. R. itlecebrosus 



28B. Fertile branches on last year's shoots; leaves 3- to 5-foliolate; flowers double; cultivated 26. R. commersonii 



23B. Carpophore absent; fruitlets rather large; petals obovate; calyx prickly 27. R. oldhamii 



20B. Flowers few, small; petals obovate to elliptic, erect, connivent above or ascending, 5-8 mm. long. 

 29A. Plants not glandular-hairy or with glandular hairs not more than 1.5 mm. long. 

 30A. Prickles slender, scarcely broadened at base, not flattened; petals ascending. 



31A. Branches, petioles, and inflorescence glandular-pilose; leaves on fertile branchlets 3-foliolate; calyx usually prickly, the 



segments caudately short-acuminate 28. R. idaeiis 



31B. Branches and leaves usually eglandular, sometimes glandular-pilose only on pedicels; leaves on fertile branches 3- to 5- 



foliolate, slightly smaller; calyx usually not prickly, the segments often filiform-elongate 29. R. yabci 



SOB. Prickles rather stout and flattened laterally, often slightly recurved above; plants without glandular hairs; petals erect or 

 connivent. 



32A. Leaves on fertile branchlets 5- to 7-foliolate; fruit red 30. R. coreaniis 



32B. Leaves on fertile branchlets 3-folio!ate. 



33A. Leaflets acuminate or very acute; calyx not prickly. 



34A. Leaflets with short white tomentum beneath, the terminal one ovate-orbicular; fruit purplish black at maturity. 



i\. R. mesogaeus 



34B. Leaflets later becoming green, the terminal one ovate to rhombic -elliptic 32. R. yoshinoi 



33B. Leaflets obtuse to rounded; calyx more or less prickly 33. R. pariiijoUui 



29B. Plant with long-stiped glandular hairs 2-5 mm. long, especially on the inflorescence, stems, and leaf-axis; calyx-segments 



connivent even in fruit 34. i?. phoenicolasius 



19B. Herbs with pedately 3- to 5-foliolate leaves. 

 35A. Herbs, unarmed, with verj^ slender filiform creeping stolons; leaflets obtuse; stipules brownish, rounded at apex. . . 35. R. pedatus 

 35B. Herbs with woody base and long ascending to erect shoots, becoming decumbent; leaflets acuminate; stipules green. 



36A. Plant armed with prickles; calyx-segments erect in fruit 36. R. il{enoensis 



36B. Plant unarmed; calyx-segments reflexed in fruit 37. R. pscudojaponicus 



1. Rubus pectinellus Maxim. Koba-no-fuyu-ichigo. creeping, slightly prickly, the erect fertile branches 10-20 cm. 

 Small evergreen pubescent suffrutescent shrub with slender, long, few-ieaved; leaves orbicular-cordate, 3-5 cm. long, ob- 

 scarcely flattened prickles; stems slender, slightly woody, tuseiy to subacutely toothed, sometimes obsoietely incised, the 



