124 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



Subgenus Ivesia. 



§8. UNGUICULATAE. 



Stems rather many from the caudex, rather leafy and many-flowered. Flowers in a 

 more or less contracted corymbiform or subcapitate cyme. Hypanthium turbinate or 

 campanulate. Petals obovate with an evident claw. Stamens 15-20, in H. argyrocoma 

 with slightly dilated filaments. Plant more or less silky hairy, not glandular, and with 

 numerous leaflets. 



Whole plant silvery white ; leaf-segments oblong ; stamens 20. 



Filaments somewhat dilated ; flowers in small subcapitate clusters. 31. S. argyrocoma. 



Filaments not dilated ; cyme corymbose. 



Petals white. 32. H. sericoleuca. 



Petals yellow. 33. H. Piekerinfjii. 



Plant somewhat silky, but not silvery white. 



Stems erect or ascending ; leaflets 5-10 mm. long ; stamens 15. 34. H. unguiculata. 



Stems decumbent ; leaflets less than 5 cm. long ; stamens 20. 35. H. campestris. 



§9. EREMICAE. 



Stems many from the caudex, decumbent or ascending, leafy. Flower-clusters open, 

 with lax branches. Hj'panthium hemispheric. Petals Ijroadly obovate or nearly or- 

 bicular, white, almost destitute of claw. Stamens 20. Plants glabrous, or slightly 

 appressed-hirsute, with numerous leaflets. 



Leaflets generally simple, 2-ranked, more or less appressed-hirsute. 36. H. eremica. 



Leaflets generally divided, perfectly glabrous. 37. ff. Kingii. 



§10. LYCOPODIOIDES. 



Low and cespitose plants with a very thick caudex and short, few-leaved and sub- 

 scapiform stems. Hypanthium hemispheric or saucer-shaped, in H. Gordonii campanu- 

 late. Petals generally cuneate or oblanceolate, mostly with a cla^v. Stamens 5 or 10. 

 Plants silky, glandular or glabrate. Leaflets, except in H. Webberi, very numerous, very 

 small and closely imbricated. 



Leaflets not bristle-tipped. 



Leaves densely white-silky, appearing wormlike from the very small numerous imbricated leaflets. 



38. H. 3111 Ir a. 



