3196 



SORBUS 



SORBUS 



variegated foliage. This species is often planted as a 

 street tree in mountain regions of Eu. 



4. tianschanica, Rupr. (Pyrus thianschdnica, Regel). 

 Small tree or shrub, similar to the preceding: young 

 branchlets glabrous, red-brown and glossy when older: 

 petioles and Ivs. glabrous; Ifts. 11-15, lanceolate, 



acuminate, ser- 

 rate, entire to- 

 ward the base, 

 dark green and 

 glossy above, 

 light green 

 beneath, about 2 

 in. long: corymbs 

 glabrous; sta- 

 mens half as long 

 as petals; styles 

 2-5: fr. globose, 

 bright red. May, 

 June. Cent. Asia. 

 Gt. 40, p. 8. B. 



3650. Sorbus domestica. (X l /i) , "755. Very 



handsome on 



account of the contrast of its dark green foliage and red- 

 brown branches. 



5. Vilmorinii, Schneid. (C6rmus foliolosa, Franch.). 

 Shrub or small tree, to 20 ft.: Ivs. slender; rachis 

 slightly winged; Ifts. 19-29, opposite or nearly so, 

 oblong-elliptic, serrate above the middle, glabrous, 

 J^-^in. long: infl. loose, 1-3 in. wide, rusty-pubescent; 

 fls. J^in. across; stamens about 20; styles 3, nearly gla- 

 brous: fr. globose, red, ^in. across. June; fr. in Sept. 

 W. China. B.M. 8241. A very graceful shrub. 



Group 2. CORMUS. 



6. domestica, Linn. (Pyrus Sorbus, Gaertn. P. 

 domestica, Smith. Cormus domestica, Spach). SERVICE 

 TREE. Fig. 3650. 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-tomentpse 

 beneath, at least when young, 1-2 H in- long: fls. white, 

 Hin- across, in broadly pyramidal rather loose, tomen- 

 tose corymbs: fr. J4-1JJ in. across, usually yellowish, 

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

 mis, Lodd., pear-shaped in var. pyrif6nnis, Lodd. May. 

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

 M.D.G. 1897 : 376-8. H.W. 3, pp. 80, 81. G.W. 1, p. 158. 

 This species is often confounded with the European 

 mountain-ash, from which it is almost indistinguishable 

 without frs. or fls., except by the glutinous winter buds. 



Hybrids of Group 1 with Group 4 or with Aronia. 



7. hybrida, Linn. (Pyrus pinnatifida, Ehrh. P. fen- 

 nica, Babington. S. intermedia x S. Aucuparia). Tree, 

 attaining 40 ft., of regular, pyramidal habit, with up- 

 right branches: young branchlets and petioles whitish 

 tomentose: Ivs. ovate to oblong-ovate, with 1-4 pairs of 

 decurrent 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. ^-J/in. across, in tomen- 

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

 high. May, June. H.W. 3, p. 86. S.I.F. 3:485. A 

 form of narrow pyramidal habit is var. fastigiata, Hort. 

 G.C. III. 42:185. Natural hybrid, occasionally found 

 with the parents in Eu. Two different hybrids are 

 usually included under S. hybrida; the typical one is 

 S. Aucuparia x S. intermedia, which has the TVS. 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. quercifolia, or S. quercoldes, Hort. The 



second hybrid is var. thuringiaca, Rehd. (Pyrus 

 thuringiaca, Use. S. thuringiaca, Schneid.), and is a 

 hybrid of S. Aucuparia x S. Aria; it has ovate to ovate- 

 oblong Ivs., somewhat less deeply lobed, 2}/-4 in. 

 long, with 8-10 pairs of veins, Ifts. and lobes broader and 

 pbtusish, with the veins usually curving upward. This 

 is known in gardens as S. quercifolia hybrida nana. Var. 

 decurrens, Koehne (S. dectirrens, Hedl. S. lanuginosa, 

 Hort., not Kit.), is a transition to S. Aucuparia; only 

 the 3 or 5 upper Ifts. are connate into a terminal 1ft., 

 which, like the upper separate Ifts., is decurrent at the 

 base, under side less densely tomentose. In some nur- 

 series under the name of S. sambucifolia. 



8. spuria, Pers. (Pyrus heterophylla, Dur. S. Aucu- 

 paria x Aronia arbutifdlia) . 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, 1^-3 Yz in. long, pubescent beneath: 

 fls. white or pinkish white, in pubescent or glabrous 

 corymbs 1-1 ^ in. broad: fr. subglobose or pear-shaped, 

 dark purple. May, June. Of garden origin. B.R. 1196. 

 Sometimes cult, under the name S. quercifolia flori- 

 bunda nana. Hybrids of different origin are usually 

 united under S. spuria; the more pubescent forms with 

 dark purple fr. are probably the offspring of S. Aucu- 

 paria and Aronia arbutifolia and represent typical S. 

 spuria, while the more glabrous forms with usually 

 blackish fr. have S. Aucuparia and Aronia melano- 

 carpa as then- parents and may be called S. fdllax, 

 Schneid. (S. heterophylla, Dipp.). A similar form with 

 quite glabrous and more pointed Ivs., is probably a 

 hybrid of S. americana and Aronia melanocarpa, and is 

 named S. sorbifolia t Hedl. (S. Sdrgentii, Dipp.). 



Group 3. TORMINARIA. 



9. torminalis, Crantz (Pyrus tormindlis, Ehrh. Tor- 

 mindria tormindlis, Dipp. T. Clusii, 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, finally gla- 

 brous, rarely with 

 persistent tomentum, 

 2-4 in. long; petioles 

 1-1% in. long: fls. 

 white, J^in. across, 

 in broad, rather loose 

 tomentose corymbs: 

 fr. oval, J^-%in. high, 

 brown, dotted. May, 

 June. S. and Cent. 

 Eu. H.W. 3:53, pp. 

 82, 83. The foliage 

 turns bright red in 

 autumn. 



Group 4. ARIA. 



10. latifdlia, Pers. 



(Pyrus rotundifolia, U 

 Bechst. P. intermedia 

 var. latifolia, Ser. P. 

 Aria var. latifolia, 

 Hort. Tormindria 

 latifolia, Dipp. S. 

 Aria x S. tormindlis). 

 Tree, attaining 50 ft., 

 similar to the pre- 

 ceding: Ivs. broadly 

 ovate to ovate, USU- 3651. Sorbus Aria. (XH) 



