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Family 4, RUBIACEJE, 



Leaves opposite or verticillate. If opposite, 

 stipulate. 



1, Cephalanthus L- BUTTON-BUSH. 



Flowers capitate. Limb of the calyx 4-den- 

 tate. Corolla tubular, slender, with 4-cleft 

 limb. Stamens 4, inserted in the throat of the 

 corolla. Style 1, exserted. Stigma capitate. 

 Ovary 2-4 celled. Cells 1-ovulate. ^ . 



1. C. OCCIDENT ALIS L. Flowers white; rare. 

 Niles Station. Summer. 



2, Galium L. BED-STRAW. CLEAVERS. 



Limb of the calyx entire, obsolete. Corolla 

 4-3 cleft, rotate. Ovary 2-celled. Cells 1- 

 ovulate. Styles 2, connate at base, capitate at 

 apex. Fruit sometimes fleshy. Stems quad- 

 rangular. Leaves verticillate. 



1. G. APARINE L. $ Fruit a dicoccous 

 schizocarp, granulate and setaceous; leaves 6-8 

 in a whorl; stem retrorsely bristly; flowers 

 white. . Common. Summer. 



2. G. BOREALE L. . Fruit a dicoccous 

 schizocarp; leaves 4 in a whorl, 3-nerved, not 

 cuspidate; flowers white. It- Tamalpais. 

 Summer. 



3. G. TRIFIDUM L. . Fruit a dicoccous 

 schizocarp; leaves 4-6 in a whorl, 1-nerved, not 

 cuspidate; flowers small, white. 2. Marin 

 County. Summer. 



