MEMOIRS FKOM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 121 



Stem few-leaved or scapiform; stameus 5-10. 10. Lycopodioides. 



Leaflets comparatively few, broadly obovate to reniform-flabelliform, merely coarsely toothed or 

 incised. 11, Saxosae. 



Subgenus Euhorkelia. 

 §1. CALIFORNICAE. 



Stout and glandular leafy plants with comparatively large leaflets. Flowers in a 

 leafy cyme. Hypanthium deeply campanulate; bractlets ovate, much exceeding the 

 sepals and petals. Petals narrow, strap-shaped, white. Stamens 10, with rather long 

 anthers and short oblong comparatively narrow filaments. 



Bractlets generally 3-toothed ; stem stout. 



Basal leaves with 3-4 pairs of leaflets ; fruiting calyx 5-6 mm. in diameter. 1. H. frondosa. 



Basal leaves with 4-10 pairs of leaflets ; fruiting calyx about 1 cm. in diameter. 2. R. Californiea. 

 Bractlets generally entire ; stem slender. 3. H. data. 



§2. CUNEATAE. 



Stem less leafy. Basal leaves pinnate, with -1-15 pairs of rather small obovate or 

 cuneate leaflets in all but one species less than 2 cm. long. Inflorescence rather openly 

 cymose, several- or many-flowered. Hypanthium cupulate or saucer-shaped ; bractlets 

 ovate or lanceolate, not exceeding the sepals. Stamens 10, with broader uniform fila- 

 ments. Pistils numerous. 



Leaflets flabelliform, dissected. 4. H. Micheneri. 



Leaflets merely toothed. 



Pubescence dense, silky, not at all glandular (rarely slightly glandular on the branches of the 

 cyme and on the hypanthium in H. Clevelandii) . 

 Pubescence very short and dense. 



Plant stout, 3-6 dm. high ; leaflets thick, obovate, 10-25 mm. long. 5. H. sericea. 

 Plant slender, 2-4 dm. high ; leaflets obovate-cuneate to reniform, 5-10 mm. long. 



6. H. Clevelandii. 

 Pubescence longer and less dense ; plants 2-4 dm. high. 



Pubescence appressed ; calyx cupulate. 7. H. Parryi. 



Pubescence spreading ; calyx nearly saucer-shaped. 8. H. Bolanderi. 



Pubescence more or less hirsute and glandular. 



Plants generally over 3 dm. high ; petals spatulate or oblong. 



Flowers 15-20 mm. in diameter ; hypanthium saucer-shaped ; pedicels often 2.5 cm. 



long. 9. H. platycalyx. 



Flowers about 10 mm. in diameter ; hypanthium cupulate ; pedicels .5-1.5 cm. long. 



10. H. puberida. 



