SORBUS 



SORBUS 



1687 



A. Foliage pinnate. 



B. L^vs. regularly pinnate, with the 

 Ifts. of almost equal size. 

 c. Fruits small, yi-% in. across 

 or slightly larger, heii-y-like. 

 (Aucuparia group, species 

 1-4.) 

 D. Winter - huds covered with 

 white villous tomenttim. 

 E. Young branchletsand Ivs. 



pubescent 1. Aucuparia 



EE. Young branchlefs and Ivs. 



glabrous 2. Tiansclianica 



DD. Winter-buds glutinous, gla- 

 brous or sparingly ap- 

 pressed, rusty-pubescent. 

 E. Zifts. long-acuminate: fls. 

 y^-li in.: fr. %-^A in. 



across 3. Americana 



EE. Lfts. acute or obtusish: 

 fls. /4-/^ in. across: fr. 



about ^A in. across 4. sambucifolia 



CC. Fruits y^ in. or more across, 

 apple- or pear-shaped, with 

 grit-cells: styles S. (Cormus 



groxip, species b) 5. domestica 



BB. Lvs. only pinnate toward the 

 base, lobed or only serrate in 

 the upper part, varying nuich 

 on the same plant and occa- 

 sionally only lobed. Hybrids. 



c. Habit tree-like 6. hybrida 



CC. Habit shrub-like 7. spuria 



AA. Foliage simple. 



B. Styles £: trees or rarely shrubs. 



c. Under side of lvs. glabrous at 



length, green: lvs. lobed: fr. 



brown, with grit-cells. (Tor- 



minaria group, species 



No. 8.) 8. torminalis 



CC. Under side of lvs. grayish or 

 whitish tomentose. {Aria 

 group, species 9-12.) 

 D. Lvs. lobed. (Seealso No.6.) 

 E. Pairs of veins S-Q. 



F. Base of the usually 

 broadly ovate lvs. 



mostly rounded 9. latifolia 



FF. Base of the ovate to ob- 

 long-ovate lvs. 



broadly cuneate 10. intermedia 



EE. Pairs of veins 3-5; under 

 side of veins densely 

 snoivy white, tomentose.il. flabellifolia 

 DD. Z/VS. not or but obscurely 



lobed; pairs of veins 6-12.12. Aria 

 BB. Styles 5j.- shrubs with crenately 

 serrate lvs. (Aronia [Adeno- 

 rhachis] gr-oup, species 13-14). 

 c. Fruits red: lvs. tomentose be- 

 neath 13. arbutifolia 



CC. Fruits black: lvs. glabrous or 



nearly so 14. m&lanocarpa 



[Aucuparia group, species 1-4.) 



1. Aucupi.ria, Linn. {Pyrus Aueupdria, Gsertn.). 

 European Mountain Ash. Rowan Tree. Fig. 2351. 

 Round-headed tree, 20 to 40, occasionally 60 ft. high: 

 young branchlets pubescent, grayish brown when older: 

 petioles more or less tomentose ; lfts. 9-15, oblong to 

 oblong-lanceolate, serrate, entire toward the base, dull 

 green above, pubescent beneath or rarely glabrous, %- 

 2 in. long: fls. white, 3^ in. across, in flat, 4-G-in. broad, 

 tomentose or sometimes almost glabrous corymbs ; sta- 

 mens about as long as petals: fr. globose, about % in. 

 across, bright red. May, June. Europe to W. Asia and 

 Siberia.— Var. dulcis, Krsetzl. (var. 3Iordvica, Zengerl. ). 

 Almost glabrous : petioles purplish; lfts. oblong-lanceo- 

 late, 2-3 in. long, glaucescent beneath. The fruits are 

 of an agreeable acid flavor and recommended for pre- 

 serves. The tree thrives well in cold northern climates 

 where hardly any other fruit tree will grow. Var. dulcis 

 laciniilta, Beissn., is a handsome and graceful form 



with the lfts. pinnately lobed and the leaf-stalks and 

 young branchlets bright red, Var. fastigiita, Loud., 

 forms a narrow pyramidal tree, with upright branches. 

 Var. p6ndula, Hort., has long and slender pendulous 

 branches. Var. R6ssica, Hort., seems little or not dif- 

 ferent from var. d^llcis. Var. frictu liiteo and var. Fi- 

 fe^na, Hort., have yellow fruits. There are vars. with 

 variegated foliage of the typical and of the weeping 

 form. The fi-uits of S. Auc^tparia, S. domestica, tor- 

 minalis and var. dulcis are edible, and the strong and 

 close-grained wood of S. domestica and S. torminalis, 

 and in a lesser degree that of S. Aucuparia, is valued 

 for handles of tools and similar small articles. See 

 Pyrus. 



2. TianscMnica, Rupr. {Pyrus Thianschdnica, 

 Regel). Small tree or shrub, similar to the preceding: 

 young branchlets glabrous, red-brown and glossy when 

 older: petioles and lvs. glabrous: lfts. 11-15, lanceolate, 

 acuminate, serrate, entire toward the base, dark green 

 and glossy above, light green beneath, about 2 in. long: 

 corymbs glabrous ; stamens half as long as petals: 

 styles 2-5: fr. globose, bright red. May, June. C.Asia. 

 Gt. 40, p. 8. B.M. 7755. — Very handsome on account of 

 the contrast of its dark green foliage and red-brown 

 branches. 



3. AmericS,na, Marsh. {Pyrus Americctna, DC. S. 

 micrdntha, Dum-Cours.). American Mountain Ash. 

 Dogberry. Fig. 2352. Small tree, attaining 30 ft., with 

 spreading branches, or sometimes shrubby: lfts. 11-17, 

 lanceolate, long-acuminate, sharply serrate, glabrous or 

 slightly pubescent when young, light green above, paler 

 beneath, l>^-4 in. long: fls. one-fifth to % in. across, in 

 dense, 3-6-in. broad, usually glabrous corymbs: fr. glo- 

 bose, bright red, J^-K in. across, with the calyx-lobes 

 very small and connivent. May, June. Newfoundland 



2351. Sorbus Aucuparia. 



(XK) 



to Manitoba, south to Mich, and N. C. S.S. 4:171, 172. 

 — Var. microcdrpa, Torr. & Gray (6'. microcdrpa, Pursh), 

 has narrower foliage and very small fruits about % in. 

 across. 



4. sambucifdlia, Roem. (P'^rus sambucifolia, Cham. & 

 Schlecht.). Western Mountain Ash. Small tree or 

 shrub, closely allied to the preceding: lfts. 7-15, oval to 

 ovate-lanceolate, obtuse to short-acuminate, sharply ser- 

 rate, glabrous and dark green above, glaucescent and 

 usually pubescent beneath when young, 13^-3 in. long: 

 fls. M-/^ in. across, in 2-4-in. broad and rather loose 

 corymbs, sometimes few-fld. : fr. globose, ovoid when 

 young, red, about J^ in. across, with more or less up- 

 right calyx-lobes. June, July. Labrador to Alaska south 

 to Pa., Mich, and Calif., N. E. Asia and Japan. S.S. 



