120 American Midland Naturalist Monograph No. 7 



glandular; stipules flat; leaflets 5 or 7, rarely 9, sharp- 

 ly serrate; thickets and open woods, local; chiefly in 

 the northern half of the state; also Union Co. May- 

 June. Meadow Rose R. hlanda Ait. 



10. Low shrubs 20-50 cm tall; prickles numerous. 



1 1 . Leaves puberulent or pubescent ; leaflets usually 9, 

 sometimes 7 or 11, mostly 1.5-4 cm long; stems 

 semi-herbaceous, weak and bristly, dying back to 

 near the ground; infrastipular prickles lacking; 

 roadsides and hedgerows, chiefly in northern and 

 central 111., s. to Tazewell Co. June-July. [R. 

 pratincola Greene, non A.Br.; R. heliophila 

 Greene; R. relicta Erlanson] R. suffulta Greene 



11. Leaves glabrous; hypanthium and pedicels without 

 glands; leaflets 7 or 9, obtuse, 1-2 cm long; 

 flowers small; along railroad, apparently native, 

 Hanover, Jo Daviess Co., June 7, 1945, G. N. 



Jones 17273 R. lunellii Greene 



9. Flowers usually solitary; cultivated species. 



12. Leaves and stems glabrous or nearly so, the stems very 

 spiny; cultivated, rarely persisting in 111.; native of 

 Eurasia. May-June. Scotch Rose. [R. pinipinelli- 

 folia L.; R. illinoensis E.G.Baker] R. spinosissima L. 



12. Leaves and stems tomentose, the stems spiny; roadsides, 



escaped from cult R. rugosa Thunb. 



13. Amelanchier Medic. — Shadbush. Serviceberry 



l.Top of the ovai-y glabrous; petals 12-18 mm long; trees or tall 

 shrubs with short-acimiinate, ovate or obovate leaves cordate or 

 rounded at base. 

 2. Young leaves and racemes densely white-tomentose, soon gla- 

 brous; sepals triangular, acute; fruit somewhat dry and mealy, 

 insipid and falling early; lowest fruiting pedicels 1-2.5 cm 

 long; wooded hillsides and banks, not imcommon throughout 



111. Apr. -May. [A. canadeyisis sensu auth., non L.] 



A. arborea (Michx.f) Fern. 



2. Young leaves and racemes nearly or quite glabrous from the 



first; sepals lanceolate, acuminate; fruit sweet and juicy; 

 lowest fruiting pedicels mostly 2.5-5 cm long; wooded hill- 

 sides in the n. part of 111. Apr. -May ..A. laevis Wieg. 



l.Top of the ovary tomentose; petals 4-12 mm long; dwarf shrubs 

 or small trees; leaves commonly oval, acutish or obtuse. 



3. Young leaves green and glabrous or nearly so from the first, 



unfolded and more than half grown at flowering time; strag- 

 gling shrubs or small trees up to 8 m tall ; Lake and Winne- 

 bago counties A. interior Nielsen 



