(281) 



2. Spiranthes Ricluud Ladies' Thes.ses. 



Anther 1, persistent, not connate with the 

 column; pollinia 2, attached to the common 

 gland. Perigonium oblique ; labellum en- 

 closed, canaliculate, embracing with its base 

 the short column. — U. Flowers forming a 

 spiral spike. 



1. S. EOMANZOFFIANA Cham. Callosities of 

 the lip smooth, obscure; flowers greenish- 

 white. — Presidio. Marin County. Autumn. 



2. S. PORRIFOLIA Lindl. Callosities of the 

 lip prominent, pointing downward ; flowers 

 greenish-white. — Marin County. Autumn. 



3. Habenaria Wiiki. 



Anther 1, persistent, entirely connate with 

 the column; pollinia 2, divergent at the lower 

 end. Perigonium ringent, galeate ; lip elon- 

 gate, spreading, calcarate. Column short. — 

 U . Caulescent. 



1. H. ELEGANS Bolander. Sepals l-nerved; 

 flowers green. — Oakland hills. San Mateo. 

 San Francisco [extinct]. Summer. 



2. H, LEUCO STAGE Ys Watson. Sepals 

 3-nerved ; flowers white. — Saucelito. San 

 Francisco [extinct]. Summer. 



4. Corallorhiza Haller. Coral-root. 



Anther 1, terminal, caducous, not adnate to 

 to the column; pollinia 4, globose. Perigonium 



