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13. Scutellaria L. SKULLCAP. 



Calyx 2-labiate, closed in fruit, at last split- 

 ting and the upper lip deciduous. Tube of 

 corolla exserted; upper lip crest shaped, with 

 2 lateral lobes; lower lip reduced to a single 

 lobe. Stamens didynamous, ascending, par- 

 allel. Anthers of the lower pair dimidiate. 



1. S. TQBEROSA Ben tli. Koot stock filiform, 

 bearing tubers; none of thelioral leaves shorter 

 than the flowers; flowers blue. 2. San Fran- 

 cisco. Contra Costa. Spring. 



2. S. CALIFORNIA Gray. Koot stock fili- 

 form, but without tubers; uppermost floral 

 leaves shorter than the flowers; flowers 

 pale. 2. Marin County. Spring. 



14. Prunella L. SELF-HEAL. 



Calyx 2-labiate, closed in fruit and flattened. 

 Corolla with a scaly or hairy ring near its base; 

 upper lip concave; lower lip 3-lobed. Stamens 

 didynamous, ascending. Anthers approximate 

 in pairs. 2. 



1. P. VULGARIS L. Flowers blue, San 

 Francisco. Summer. 



15. Marrubium L. HOREHOUND. 

 Calyx tubuLir, 5-10 dentate. In fruit the 

 teeth spreading. Tube of the corolla included. 

 Limb 2-labiate. Stamens didynamous, includ- 

 ed. Cells of anthers divaricate. 2. 



