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13. Scutellaria Li- Skullcap, 

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

 ting and the upper lip deciduous. Tubeof 

 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. TUBEROSA Benth. Root stock filiform, 

 bearing tubers; none of the tloral leaves shorter 

 than the flowers; flowers blue. — 11. San Fran- 

 cisco. Contra Costa. Spring. 



2. S. Californica Gray. Boot stock fili- 

 form, but without tubers; uppermost floral 

 leaves shorter than the flowers; flowers 

 pale. — U' 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. — U- 



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. — U- 



