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1. S. BELLUM Watson. Filaments united to 

 the top; flowers blue with yellow center. 1. 

 Common. Summer. 



2. S. CALIFORNICUS Ait. Filaments united 

 only at the base; flowers yellow. 2. Colma. 

 Saucelito. Summer. 



2, IrisL. 



Perigonium tubular at the base; segments 

 equal, but differing in shape; the 3 external 

 reflexed; the 3 internal erect. Stigrna 3-parted, 

 petaloid. U- 



1. I. MACROSIPHON Torr. Tube of the peri- 

 gonium elongated, cylindrical; stem leafy; 

 capsule ovoid, acute at each end; flowers varia- 

 ble in color, but most frequently lilac-purple. 

 Marin County. Spring. 



2. I. DOUGLASIANA Herbert. Tube of the 

 perigonium elongated, cylindrical; stem leafy; 

 .capsule oblong, 3-gonal; flowers pale lilac, ex- 

 ternal sepals with white center, lined with 

 purple. Common. Spring. 



3. I. LONGIPETALA Herbert. Tube of the 

 perigonium short and funnel-shaped; stems al- 

 most naked; flowers lilac, external sepals 

 white, veined with violet; midrib yellow. 

 Common. Spring. 



ORDER 3. COBONARiaS. Perigonium 6- 

 parted in different degrees. Stamens 3 or 6. 

 Ovary superior. 



