542 ROSACEAE 



6B. Buds solitary; leaves conduplicate in bud. 

 9A. Calyx-lobes erect to spreading. 



lOA. Glands present at or near the base of the leaves; flowers usually vifithout a common peduncle; calyx, young branches, leaves 

 beneath, and petioles usually pilose or pubescent. 



11 A. Pedicels, petioles, and young branchlets with spreading hairs 8. P. apetala 



IIB. Pedicels, petioles, and young branchlets with appressed to ascending hairs. 



12A. Leaves with few pairs of lateral nerves, 3-5 cm. long or sometimes more, doubly incised-toothed, the teeth not ending 



in a gland 9. P. incisa 



12B. Leaves with 7-14 pairs of lateral nerves, 5-12 cm. long, sparingly double-toothed, the teeth ending in a gland; calyx 



urceolate 10. P. pendiila 



lOB. Glands present near top of the petioles; flowers often in a corymb with a distinct common peduncle; leaves rarely pilose 

 or pubescent beneath ; branchlets and calyx glabrous. 

 13A. Calyx-tube campanulate-infundibuliform, 2-3 times as long as the lobes; flowers scarlet, not fully open, nodding; stones 



pitted \\. P. campanulata 



13B. Calyx-tube tubular or campanulate-tubular, as long as to longer than the lobes; flowers pale pinkish, rarely white or 

 greenish. 



14A. Leaves smaller, 4-8 cm. long, with acute incised double teeth, the petioles 7-15 mm. long 12. P. nipponica 



14B. Leaves larger, 8-13 cm. long, with acute often awn-tipped simple or sparingly double teeth, the petioles 1.5-3 cm. long. 

 15A. Leaves oblong to ovate-elliptic, with scarcely awn-tipped teeth, deep green above, whitish and not lustrous beneath. 

 16A. Leaves usually oblong, rounded to acute at base, finely toothed; branchlets rather slender, dark grayish brown or 



dark brown; flowers in corymbs 13. P. jamasa\ura 



16B. Leaves usually elliptic, rounded to shallowly cordate (at least some of them), more coarsely toothed; branchlets 



rather stout, dark brown; flowers usually in sessile umbels 14. P. sargentii 



15B. Leaves obovate to elliptic, with rather coarse awn-tipped teeth, pale to vivid green above, pale or bright green and 

 lustrous beneath. 

 17A. Calyx-lobes entire or nearly so; bracts small, 4-6 mm. long; leaves thin, 4-6 cm. wide, with very short awn- 

 tipped teeth; petioles and pedicels usually more or less spreading short-pubescent 13. P. verecunda 



17B. Calyx-lobes serrulate with minute glandular-tipped teeth; bracts large, about 1 cm. long; leaves rather thick, 5-8 



cm. wide, awn-teeth about 2 mm. long; petioles and pedicels glabrous 16. P. lannesiana 



9B. Calyx-lobes reflexed; petals not retuse. 



18A. Involucral bracts (bud scales of flowering bud) persistent through anthesis; inflorescence a sessile umbel; leaves with short 



obtuse teeth 17. P. avium 



18B. Involucral bracts or bud-scales early deciduous; inflorescence a short raceme with persistent green bracts; leaves doubly 



incised-toothed 1 8. P. maximowiczii 



IB. Inflorescence a many-flowered raceme. 

 19A. Calyx deciduous after anthesis. 

 20A. Leaves evergreen; racemes not leafy below. 



21 A. Glands of leaves on upper portion of petioles; inflorescence solitary to 5-nate; leaves 10-20 cm. long, 4-7 cm. wide, usually 



acutely toothed 19. P. zippeliana 



21B. Glands of leaves usually near the base of the blade; inflorescence solitary; leaves 6-10 cm. long, 2-3 cm. wide, the teeth some- 

 times obscure or sometimes large, spine-tipped 20. P. spintilosa 



20B. Leaves deciduous; racemes with 1-3 leaves at base. 



22A. Leaves cordate, with rather awnlike mucronate teeth; glands of leaves at top of petioles 21. P. ssiori 



22B. Leaves acute to obtusely rounded at base. 



23A. Glands of leaves at the top of the petioles; leaves with 10-13 pairs of lateral nerves; stamens shorter than the petals. 



22. P. padus 

 23B. Glands of leaves on lower margin of the blade; leaves with 7-8 pairs of lateral nerves; stamens longer than the petals. 



23. P. grayana 

 19B. Calyx persistent; leaves deciduous; racemes not leafy at base 24. P. buergeriana 



1. Prunus salicina Lindl. P. trijlora Roxb. Su-momo. precocious; drupe red, short-pilose, nearly globose, the stones 



Small tree with lustrous glabrous branches; leaves broadly roughened. Apr. Introduced from China and long culti- 



oblanceolate to narrowly obovate, 5-10 cm. long, 2-4 cm. wide, vated in Japan. 



abruptly acuminate, cuneate at base, subduplicately obtuse- 3. Pninus mume Sieb. & Zucc. Ume. Small tree with 

 serrulate, thinly pubescent beneath while young, becoming green branchlets; leaves broadly ovate, 4-10 cm. long, long- 

 glabrous on both sides or slightly pilose in axils beneath, the acuminate, broadly cuneate at base, acutely serrulate, sparingly 

 petioles 1-2 cm. long, usually thinly pubescent and with 2-5 pilose or sometimes only on nerves beneath, the petioles short- 

 glands on the upper portion; flowers usually in 3's, white, pilose above; flowers 1 or 2, appearing before the leaves, white 



15-20 mm. across, the pedicels glabrous, 1-1.5 cm. long; drupe or pink; drupe subglobose, the stones rugose. Feb.-Apr. 



ovoid-globose, 5-7 cm. across, with a depression at base. Said to be indigenous in the mountainous parts o£ Kyushu. A 



Apr. Chinese tree long cultivated in our area and sometimes much-planted Chinese tree with many cultivars grown, 



naturalized. 4. Prunus persica (L.) Batsch. Amygdaliis persica L.; 



2. Prunus ansu (Maxim.) Komar. P. armeniaca var. Persica vulgaris Mill.; Prunus persica var. vulgaris Maxim. 



ansu Maxim. Anzu. Small tree; leaves broadly ovate or Momo. Small tree with glabrous elongate branches; leaves 



ovate-orbicular, 6-8 cm. long, 4-7 cm. wide, caudately acumi- lanceolate to broadly oblanceolate, 8-15 cm. long, 15-35 mm. 



nate, rounded to subtruncate at base, glabrous, serrulate, the wide, long-acuminate, serrulate, glabrescent, the petioles 4-10 



petioles 20-35 mm. long, glabrous; flowers pink to white, mm. long, with glands on the upper portion; flowers pink to 



