322 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
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 corymboée. 
Styles 5; flowers racemose..........---.--------. .. 1. AMELANCHIER (p. 322), 
Styles 2; flowers solitary, or sessile in 2 or 3-flowered 
corymbs.............0.---...20e2 eee eee eee 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. Sorsus (p. 324), 
1. AMELANCHIER L. Servicer 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 which grow at lower levels 
are nearly dry and consequently useless for food. 
KEY TO THE SPECIES. 
Leaves acutish, oblong-ovate.....-.-. cece cece cece ee eeeeeceeees 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. bakeri. 
Mature leaves glabrous or loosely villous, never finely pubes- 
cent. 
Whole plant perfectly glabrous............ --++e+- 4. A. polycarpa. 
Bud scales, and usually the young leaves, villous. 
Mature leaves glabrous, conspicuously cordate, 
crenate to the base..............2.......2-.--. 5. A. goldmanii. 
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. oreophila, 
Leaves thick, coriaceous, pale green or glau- 
cescent; calyx lobes longer than the 
fruit, foliaceous...........2....--..-- 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). 
Rance: Southwestern Colorado and northwestern New Mexico. 
New Mexico: Western San Juan County; Kingston. Dry hills, in the Upper Sono- 
ran Zone. 
