Perianth cernuous with the segments very revolute. Stamens diverging on
all sides.
(_a_) Leaves in whorls. (α) American species; bulbs annual bearing
rhizomes. 27. _Canadense._ 28. _Pardalinum._ 29. _Superbum._
30. _Lucidum._ 31. _Roezlii._ 32. _Columbianum._ 33. _Humboldti._
(β) Old world species. 34. _Martagon._ 35. _Avenaceum._ 36. _Hansoni._
(_b_) Leaves scattered, (α) Leaves lanceolate. Many-nerved.
(i.) Perianth falcate above middle. 37. _Monadelphum._ (ii.) Perianth
revolute to below middle. 38. _Polyphyllum._ 39. _Ponticum._
40. _Carniolicum._ (β) Leaves narrow. With one or few nerves.
(i.) Segments of the perianth from six to twelve lines broad in the
middle. 41. _Testaceum._ 42. _Leichtlini._ 43. _Batmanniae._
44. _Pseudo-Tigrinum._ 45. _Wallacei._ (ii.) Segments of the perianth
from three to six lines broad in the middle. 46. _Pomponium._
47. _Chalcedonicum._ 48. _Callosum._ 49. _Tenuifolium._