322 CONTEIBUTIONS EEOM THE NATIONAL HERBAEIUM. 



KEY TO THE GENERA. 



Cavities of the ovary becoming twice as many as the 

 styles by a partial or complete false partition; 

 flowers racemose or corymbose. 



Styles 5; flowers racemose 1. Amelanchier (p. 322). 



Styles 2; flowers solitary, or sessile in 2 or 3-flowered 



corymbs 4. Peraphyllum (p. 324). 



Cavities of the ovary not divided, as many as the styles; 

 flowers in corymbiform cymes. 



Leaves simple, lobed; ovules 1 in each carpel 2. Crataegus (p. 323). 



Leaves pinnate; ovules 2 in each carpel 3. Sorbus (p. 324). 



1. AMELANCHIER L. Service berry. 



Shrubs or small trees, 1 to 2 meters high, with alternate, simple, mostly rather 

 coarsely serrate, small leaves and white flowers in racemes terminating short branches 

 of the year; stamens numerous, all borne on the hypanthium, the latter adnate to 

 the inferior ovary; fruit berry-like. 



The fruits of the native service berries were a favorite food among the Indians in 

 earlier days. They were eaten fresh or were dried and preserved for winter use. 

 They are insipid in all the species. Those of the species wliich grow at lower levels 

 are nearly dry and consequently useless for food. 



key to the species. 



Leaves acutish, oblong-ovate 1. A. rubescens. 



Leaves obtuse to truncate, broader. 



Mature leaves finely pubescent, at least beneath. 



Leaves crenate, pubescent on both surfaces 2. A. crenata. 



Leaves sharply serrate, pubescent beneath 3. A. halceri. 



Mature leaves glabrous or loosely villous, never finely pubes- 

 cent. 



Whole plant perfectly glabrous 4. A. polycarpa. 



Bud scales, and usually the young leaves, villous. 

 Mature leaves glabrous, conspicuously cordate, 



crenate to the base 5. A. goldinanii. 



Mature leaves with loose pubescence beneath and 

 often above, not cordate or but slightly so, often 

 cuneate, usually entire below the middle. 



Petals 10 to 15 mm. long 7. A. mormonica. 



Petals 8 mm. long or less. 



Leaves thin, bright green; calyx lobes shorter 



than the fruit, not foliaceous 6. A. oreopMla. 



Leaves thick, coriaceous, pale green or glau- 

 cescent; calyx lobes longer than the 

 fruit, foliaceous 8. A. australis. 



1. Amelanchier rubescens Greene, Pittonia 4: 128. 1900. 



Type locality: In arroyos and among the hills about Aztec, New Mexico. Type 

 collected by Baker (nos. 380, 381). 



Range: Southwestern Colorado and northwestern New Mexico. 



New Mexico: Western San Juan County; Kingston. Dry hills, in the Upper Sono- 

 ran Zone. 



