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1, Prunus L. PLUM. CHEREY. 

 Drupe fleshy; endocarp not rugose. +> . 



1. EMARGINATA Wa 1 p e r s . Flowers in a 

 corymb; petals white. Tamalpais. Spring. 



Black, cherry-like fruit. Not poisonous, 

 although not edible. 



2. P. DEMISSA Walpers. Flowers in termi- 

 nal racemes; petals white. Mills Seminary. 

 Marin County. Spring. 



Dark red or purplish cherry. Edible. 

 1 'Choke-cherry." 



3. P. ILICIFOLIA Walpers, Flowers in leaf- 

 less racemes from the axils of evergreen leaves; 

 petals white. Common. Spring. "Holly- 

 leaf Cherry." 



Bed or purplish cherry, not of bad taste, but 

 suspicious. The leaves at times prove poison- 

 ous to sheep and cattle, probably only when 

 by their withering hydrocyanic acid is devel- 

 oped, the smell of it in the withering leaves 

 becomes very perceptible. 



2, Nuttallia Torr. & Gray. 



Flowers polygamous. Ovaries 5. Fruit sev- 

 eral 1-seeded drupes. Flowers white. . 



1. N. CERASIFORMIS Torr. & Gray. Flowers 

 white. Common. Spring. 



Drupes blue, of agreeable but slightly bitter 

 taste, but suspicious. 



