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KOSACEAE (ROSE FAMILY) 459 



3-10-) fruited ; fruit larger, 8-10 mm. in diameter, claret-colored to purplish- 

 black. (Aronia Britton.) Similar habitats, centr. Me., southw. and westw. ; 

 common. 



8. P. melanocarpa (Michx.) Willd. Shrub, similar in habit, generally of 

 lower stature ; leaves varying from rather broadly oblong and acuminate to 

 spatulate-oblanceolate and scarcely pointed, glabrous or early glabrate beneath 

 as well as above ; pedicels and calyx also nearly or quite smooth ; fruit very dark 

 purple or essentially black. (Aronia nigra Britton.) Moist woods, but also 

 rocky uplands ; common northw. and extending southw. in the Alleghenies at 

 least to N. C. 



The members of this section occasionally form natural hybrids with those of 

 4. These may be recognized usually by their imperfectly pinnate or pinnatirid 

 leaves. 



4. S6RBUS (L.) S. F. Gray. (MOUNTAIN ASH.) Leaves odd-pinnate, with 

 rather numerous leaflets; cymes compound; styles distinct ; pome berry- 

 like, small. Trees or tall shrubs. SORBUS [Toura.] L. 



9. P. americana (Marsh.) DC. (AMERICAN M.) Nearly glabrous or soon 

 coming so ; leaflets 13-15, lanceolate, taper-pointed, sharply serrate with 



pointed teeth, bright green ; cymes large and flat ; berries globose, bright red, 

 not larger than peas. (Sorbus Marsh.) Woods, Lab. to Man., s. to n. and 

 w. N. E., N. Y., the Great L. region, and in the mts. to N. C. ; common. 



10. P. sitchSnsis (Roem.) Piper. Nearly glabrous; leaflets oblong, oval, 

 or lance-ovate, mostly obtuse or abruptly pointed, serrate (often doubly) 

 with more spreading teeth, rather pale beneath, of firmer texture than in the 

 preceding ; flowers (earlier) somewhat larger (8-11 mm. broad) ; fruit 8-10 

 mm. in diameter. (P. sambucffolia Man. ed. 6, not C. & S. ; Sorbus Roem.) 

 River- banks and damp rocky uplands, Lab. to centr. Me., westw. and north- 

 westw. to the Pacific. 



11. P. AUCUPARIA (L.) Ehrh. (EUROPEAN M., ROWAN TREE.) Leaflets 

 narrowly oblong, mostly obtuse, rather pale beneath, always more or less pubes- 

 cent or tomentose at least on the lower surface. (Sorbus L.) Extensively 

 cultivated for ornament, and now tending to become naturalized. (Introd. 

 from Eu.) 



7. AMELANCHIER Medic. JUNEBERRY 



Calyx 5-cleft. Petals obovate to oblong, rarely linear. Stamens numerous, 

 short. Styles 5, united below. Ovary 5-celled, each cell 2-ovuled, but with a 

 projection growing from the back of each and forming a false cartilaginous 

 partition, the sweet and edible berry-like pome thus 10-celled, with one seed 

 in each cell (when all ripen). Small trees or shrubs, with simple leaves, 

 and white racemose flowers. (Name said to be barbaric, the derivation not 

 satisfactorily explained.) 







Petals narrowly oblong, 14-25 mm. in length ; early flowering ; leaves finely 



and sharply serrate 1. A. canadensis. 



Petals oblong to obovate, 4-12 mm. in length. 

 Flowers racemed ; racemes normally 5-oo -flowered ; leaves (at first folded 



lengthwise) mostly obtuse, sometimes even cordate at base. 

 Flowering early (mostly 1 Apr.-15 May, fruit ripe June-July) ; leaves 



oblong or suborbicular-oblong, finely serrate 2. A. oblongifolia. 



Flowering later (mostly 15 May-25 June, fruit ripe Aug.-Sept.); leaves 



suborbicular-oblong, coarsely dentate 3. A. spicata. 



Flowers solitary or 24 in terminal fascicles ; leaves (flat even in very early 



stages) acutish or subcuneate at base 4. A. oligoearpa. 



1. A. canadlnsis (L.) Medic. (SHAD BUSH, SERVICE BERRY.) Tree or 

 shrub, 3-12 m. high, nearly or soon glabrous; leaves (when young folded 

 lengthwise and brownish-purple) ovate to ovate-oblong, usually somewhat cor- 

 date at base, pointed, finely and sharply serrate, 4-9 cm. long, 3-6 cm. wide ; 

 bracts and stipules very long-silky-ciliate ; flowers large, in drooping racemes ; 



