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5. O. PUSILLUS Benth. Lower lip 3-saccate, 

 larger than the slender, straight upper lip; an- 

 thers 1-celled; stamens not wrapt in the lanceo- 

 late upper lip; corolla purplish, its tube not 

 surpassing the calyx. Common. Spring. 



6. O. PURPUBASCENS Benth. Lower lip sim- 

 ply saccate, broader but not longer than the 

 upper lip, the tip of which is incurved and 

 back bearded; bracts and corolla white, rose or 

 crimson. Common. Spring. 



7. O. CASTILLEIOIDES Benth. Lower lip ven- 

 tricose; upper lip straight, its back not beard- 

 ed; leaves lanceolate, commonly laciniate; upper 

 leaves not attenuate, but cuneate-dilated and 

 deeply cleft; spike dense; bracts and corolla 

 pale, sometimes sprinkled with red. Marsh 

 near Tamalpais. Spring. 



8. O. DENSIFLORUS Benth. Lower lip ventri- 

 cose; upper lip straight, its back not bearded; 

 leaves linear; upper leaves attenuate; bracts 3- 

 cleft, as long as the flowers; spike dense; bracts 

 and corolla purple and white. Common. 

 Spring. 



9. O. ATTENUATUS Gray. Lower lip ventri- 

 cose; upper lip straight, its back not bearded; 

 leaves linear; bracts with slender lobes, her- 

 baceous and barely white- tipped; flowers pale; 

 lower lip purple-spotted; spike virgate. Com- 

 mon. Spring. 



