ROSE FAMILY 127 



Stem 1 m. high or more; leaflets usually more than 2 cm. long, 

 pale or light green, rather tlrm, rarely double-serrate, not 

 glandular-granuliferous beneath; calyx not densely glandular. 



15. R. melina. 

 Stem usually less than 3 dm. high; leaflets usually less than 2 

 cm. long, dark green, glandular-double-toothed; calyx usually 

 covered with stalked glands. 16. R. aciculata. 



Leaflets sparingly pubescent beneath. 17. R. oreophila. 



Flowers mostly corymbose, if solitary the petals 2 cm. long or less; fruit rarely 

 more than 1 cm. thick. 

 Prickles more or less curved. 



Leaflets fljiely puberulent or glandular-granuhferous, or both beneath. 

 Hypanthium ellipsoid; yoimg shoots with rather few strong curved 



prickles. IS. R. ncomexicana. 



Hypantliium globose; young shoots with fine, often rather many prick- 

 les. 19. R. puberulenta. 

 Leaflets perfectly glabrous. 20. R. manca. 

 Prickles straight or nearly so. 



Hypanthium globose; neck usually obsolete. 



Stipules, petioles, and rachis conspicuously glandular. 



21. R. Fendleri. 

 Stipules, petioles, and rachis not conspicuously glandular, usually 



glandless. 

 Leaflets glabrous or nearly so. 



Leaves yellowish green; fruit orange; corymb several-flowered. 



22. R. chrysocarpa. 

 Leaves dark green above, paler beneath; fruit purphsh red; 



flowers 1-3. 23. R. Woodsii. 



Leaflets more or less pubescent beneath. 



Leaflets elhptic or oval, equally green on both sides. 



Leaflets broadly oval, thin, 2-5 cm. long; plant nearly un- 

 armed. 24. R. salictorum. 

 Leaflets narrowly oval, less than 3 cm. long, rather firm; 

 plant prickly. 25. R. ullramontana. 

 Leaflets obovate, or if elliptic, more or less glaucous beneath. 

 Leaflets tliin, very sharply serrate, equally green on both 

 sides; sepals with a few slender bristles near the margins; 

 prickles very slender. 26. R. praetincta. 

 Leaflets flrmer, paler beneath; sepals without bristles; prickles 

 stouter. 27. R. Macounii. 

 Hypanthium elongate, pear-shaped, with a distinct neck. 



28. R. pyrifera. 

 Pistils few; styles deciduous with the upper part of the hypanthium, which falls off as a 



ring. 

 Leaflets very thin, scarcely paler beneath, with distinct reticulations. 



29. R. gymnocarpa. 

 Leaflets not very thin, pale and indistinctly reticulate beneath. 



30. R. leucopsis. 



Family 61. MALACEAE. Apple Family. 



Cells of the fruit by false partitions twice as many as the styles. 



Flowers racemose; styles 3-5, rarely 2. 1. Amelanchier. 



Flowers solitary or in 2- or 3-flowered corymbs; styles 2. 2. Peraphtllum. 



Cells of the fruit as many as the styles. 



Leaves pinnately compound; carpels leathery at maturity. 3. Sorbus. 



Leaves simple, more or less pinnately lobed; carpels bony at maturity 



4. Crataegus. 



1. AMELANCHIER Medic. Service-berry, June-berry, Shadberry. 



Top of the ovary, winter buds, and leaves glabrous from the beginning; fruit juicy; styles 

 mostly 5. 

 Sepals mostly sparingly hairy within. 



Petals oblanceolate, 18-20 mm. long; leaves thin, green. 1. A. Cusickii. 



Petals oblong, 10-15 mm. long; leaves flrmer, pallid. 2. A. basallicola. 



Sepals perfectly glabrous on both sides; petals 10-12 mm. long. 

 Leaves green; styles 5, all united; twigs brown. 



Leaves moderately toothed; lower one-third of the blade entire; teeth rarely 



over 2 mm. long. 3. A. polycarpa. 



Leaves coarsely toothed to near the base; teeth 3-4 mm. long. 



4. A. pumila. 

 Leaves bluish-green; styles 4, two and two imited; twigs gray. 



11. A. Jonesiana. 

 Top of the ovary and usually the winter buds pubescent; leaves hairy beneath, at least 

 when yomig. 

 Fruit glabrous, in age purple, juicy ; styles mostly 5, rarely 4. 



Leaves glabrous above, wliite-tomentose but soon glabrate beneath. 

 Leaves mostly acute at the apex, toothed to near the base. 



Leaf-blades elliptic, finely toothed, short-acuminate. 5. A. canadensis. 

 Leaf-blades oval, coarsely toothed, acute or obtuse. 6. .4. humilis. 



Leaves truncate or rounded at the apex, mostly toothed above the middle. 



