124 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 
Subgenus Ivesra. 
$8. UNGUICULATAE. 
Stems rather many from the caudex, rather leafy and many-flowered. Flowers im 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 subeapitate clusters. 31. H. argyrocoma. 
Filaments not dilated ; cyme corymbose. 
Petals white. 32. H. sericoleuca. 
Petals yellow. 33. H. Pickeringt. 
Plant somewhat silky, but not silvery white. 
Stems erect or ascending; leaflets 5-10 mm. long ; stamens 15. 34. H. ungwiculata. 
Stems decumbent; leaflets less than 5 em, long; stamens 20. 35. H. campestris. 
§9. EREMICAE. 
Stems many from the caudex, decumbent or ascending, leafy. Flower-clusters open, 
; 
with lax branches. Hypanthium hemispheric. Petals broadly 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. H, Wingii. 
S10, 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 claw. 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. Muirii. 
