1688 



SORBUS 



4:173, 174. A very variable species; the eastern form 

 resembles more tbe preceding species, and intermediate 

 forms are not uncommon in the northeastern states. 

 The most distinct form is var. Grayi, Wenz. (var. pu- 

 mila, Sarg. Fyrus occidentalis , Wats.). Shrubby: 

 Ifts. 7-11, oval to oval-oblong, obtuse, with only a few 

 teeth at the apex, bluish green: corymbs 1-2 in. across. 

 Wash, to Calif. G.F. 10:85. S. sambucifolia is often 



2352. Sorbus Americana (X%). 



confounded with the preceding species; bom are very 

 handsome in autumn with their large clusters of bright 

 red fruits. Sometimes a form of S. hybrida is found in 

 American nurseries under the name of S. sambucifolia. 



(Cormus and Hybrid group, species 5-7) 



5. dom6stica, Linn. (Pyrus Sorbus. Gaertn. P. do- 

 mestica, Smith. C6rmus dome'stica, Spach). SERVICE 

 TREE. Fig. 2353. Round-headed tree, 30-60 ft. high: 

 winter-buds glutinous: petioles tomentose; Ifts. 11-17, 

 obovate-oblong to oblong, sharply and rather coarsely 

 serrate, with acuminate teeth, usually entire near the 

 base, green and glabrous above, floccose-tomentose be- 

 neath, at least when young, 1-2% in. long: fls. white, 

 % in. across, in broadly pyramidal rather loose, tomen- 

 tose corymbs: fr. %-!% in. across, usually yellowish, 

 with red or orange cheek, apple-shaped in var. malifdr- 

 mis, Lodd., pear-shaped in var. pyrifbrmis, Lodd. May. 

 S. Eu., N. Afr. and W. Asia. G.C. II. 1:283; 6:649. 

 M.D.G. 1897:376-378. This species is often confounded 

 with the European ash, from which it is almost indis- 

 tinguishable without fruits or flowers, except by the 

 glutinous winter-buds. 



6. hybrids, Linn. (Pyrus pinnatifida, Ehrh. P.Fin- 

 nica, Babingt. S. intermedia x Aucuparia). Tree, at- 

 taining 40 ft., of regular, pyramidal habit with upright 

 branches: young branchlets and petioles whitish tomen- 

 tose; Ivs. ovate to oblong-ovate, with 1-4 pairs of de- 

 current Ifts. at the base, or but pinnately lobed, upper 

 part lobed with the lobes becoming gradually shorter 

 and more indistinct toward the apex, dark green above, 

 whitish or grayish tomentose beneath, 2%-5 in. long; 

 petioles about 1 in. long: fls. Vz-Yi in. across, in tomen- 

 tose corymbs about 3 in. broad: fr. globose-ovoid, % in. 

 high. May, June. Natural hybrid, occasionally found 

 with the parents in Europe. Two different hybrids are 

 usually included under S. hybrida ; the typical one is 

 8. Aucuparia x intermedia, which has the Ivs. oblong- 

 ovate to oblong, 3-5 in. long, with 10-12 pairs of veins, 

 the Ifts. and lobes narrower and pointed and the veins 

 often slightly recurved. It is mostly cult, under the 

 name of S. querci folia or quercoldes, Hort. The second 

 hybrid is var. Thuringlaca , Rehd. (Pyrus Thuringlaca, 

 Use), and is a hybrid of S. Aucuparia x Aria ; it has 



SORBUS 



ovate- to ovate -oblong Ivs., somewhat more deeply 

 lobed, 2%-4 in. long, with 8-10 pairs of veins, Ifts. and 

 lobes broader and obtusish, with the veins usually 

 curving upwards. This is known in gardens as S. quer- 

 cifblia hybrida nana. Var. decurrens, Koehne (S. lanu- 

 ginbsa, Hort., not Kit.), is a transition to S. Aucupa- 

 ria ; only the 3 or 5 upper Ifts. are connate into a ter- 

 minal 1ft., which, like the upper separate Ifts., is decur- 

 rent at the base, under side less densely tomentose. In 

 some nurseries under the name of S. sambucifolia. 



1. spuria, Pers. (Pyrus heterophylla, Dur. S. Au- 

 cuparia x arbutifolia). Shrub or small tree, attaining 

 15 ft., with slender, sometimes pendulous branches: 

 Ivs. ovate to oblong-ovate, obtuse, with 2-6 lobes or Ifts. 

 near the base, simply crenate-serrate toward the apex, 

 l%-3% in. long, pubescent or glabrous beneath: fls. 

 white or pinkish white, in pubescent or glabrous co- 

 rymbs ]-l>2 in. broad: fr. subglobose or pear-shaped, 

 dark purple or almost black. May, June. Of garden 

 origin. B.R. 14:1196. Sometimes cultivated under the 

 name S. querci folia floribunda nana. Hybrids of dif- 

 ferent origin are usually united under S. spuria; the 

 more pubescent forms with dark purple fr. areprobably 

 the offspring of S. Aucuparia and S. arbutifolia, while 

 the more glabrous forms with usually blackish fruit 

 have <S>. Aucuparia and S. melanocurpa as their parents. 

 A similar form with quite glabrous and more pointed 

 Ivs., originated at the Arnold Arboretum and probably 

 a hybrid of S. Americana and S. melanocarpa, was 

 named S. Sdrgenti, Dipp. 



(Torminaria group, species No. 8.) 



8. torminalis, Crantz (Pyrus torminalis, Ehrh. Tor- 

 minaria torminalis, Dipp. T. C'liisii, Roem.). WILD 

 SERVICE TREE. Round-headed tree, with spreading 

 branches, 40-80 ft. high: Ivs. broadly ovate, slightly 

 cordate to broadly cuneate at the base, with several tri- 

 angular-ovate, serrate lobes on each side, the lower 

 sinuses reaching about half way to the middle, floccose- 

 tomentose when young, 2-4 in. long; petioles 1-1% in. 

 long: fls. white, % in. across, in broad, rather loosa 

 tomentose corymbs: fr. oval, %-% in. high, brown, 

 dotted. May, June. Southern and middle Europe. 

 The foliage turns bright red in fall. 



'(Aria group, species 9-12.) 



9. latifolia, Pers. (Pyrus rotundi folia, Bechst. P. 

 intermedia, var. latifblia, Ser. P. Aria, var. latifolia, 

 Hort. Torminaria latifolia, Dipp. S. Aria x tormi- 

 nalis). Tree, attaining 50 ft., similar to the preceding: 

 Ivs. broadly ovate to ovate, usually rounded at the base, 

 pinnately lobed with short, broadly triangular, sharply 

 serrate lobes and with 6-9 pairs of veins, grayish or 

 whitish tomentose beneath, 2%-4 in. long: petioles 

 %-l in. long: fls. about % in. across, in broad, tomen- 

 tose corymbs: fr. globose or globose-ovoid, about % in. 

 high, orange to brownish red. May, June. Occasionally 

 occurring in middle Europe. 



2353. Sorbus domestica (X %). 



10. intermedia, Pers. (Pyrus intermedia, Ehrh. S6r- 

 bus Scdndica, Fries. Ana Suecica, Koehne. Hdnnia 

 Suecica, Dipp.). Tree, 20-40 ft. high, with oval head: 

 Ivs. ovate to oblong-ovate, broadly cuneate at the base, 



