4 NORTH AMERICAN FLORA [V01.UME 22 



2. MARATHRUM H. & B. PL Aequin. 1 : 39. 1806. 



Aquatic submersed herbs with a thickened disc-like or short dichotomously branched 

 rhizome, leaf-blades which vary from broad, flat and more or less lobed, to decompound, 

 and solitary flowers. Flowers at first concealed in a spathe ; this is finally irregularly dis- 

 rupted by the growing pedicel, which attains sometimes a. length of several centimeters. 

 Perianth rudimentary. Stamens 5-25, in a complete whorl. Ovary 2-celled. Styles 2, free 

 or somfewhat united at the base. Capsule of 2 equal nervose valves, dehiscent. 



Type species, Marathrum foeniculaceuni H. & B, 



Pedicel abruptly enlarged at the apex, forming a broad bowl-shaped hypanthium. 

 Capsule with the nerves prominent ; leaves with the divisions usually 



erect or erect-ascending. 1. M. foeniculaceum. 



Capsule with the nerves not prominent ; leaves with the divisions spread- 

 ing or ascending, resembling those of Achillea Millefolium. 2. M. Schiedeanum. 

 Pedicel barely if at all enlarged at the apex. 

 Capsule less than 3 mm. long. 



Pedicel less than 1 cm. long ; leaves often 2 dm. long. 3. M. cubanum. 



Pedicel 1.5-3.5 cm. long ; leaves 6 cm. long or less. 4, M. modestum. 



Capsule 4-5 mm. long. 5. M. oxycarpum. 



1. Marathrum foeniculaceum H. & B. PI. Aequin. 1 : 40. 1806. 



Lads foeniculacea Mart. Nov. Gen. 1 : 6. 1823. 



Rhizome somewhat fleshy, disc-like and more or less lobed. Leaves 1.5-2.5 dm. long, 



the blade 3-4-pinnatifid, the ultimate divisions filiform ; pedicel, when mature, 1-4 cm. long, 



abruptly thickened into a broad bowl-shaped hypanthium about 2 mm. broad ; stamens 5-8, 



the filaments linear, varying from shorter than the capsule to longer ; capsule ellipsoid, 



acutish, about 4 mm. long, prominently 8-nerved, short-stipitate. 



Type locality : Salto de Tequendama, New Granada. 

 Distribution : Mexico {^fide Hemsley), Panama and Colombia. 



Illustrations : Humb. & Bonpl. PI. Aequin. 1 : pi. 11 ; Lam. Bncyc. 111. 4 : pi. 941 ; Diet. 

 Sci. Nat. pi. 42 ; Schnitzl. Icon. pi. 85, f. 24 ; Vidensk. Selsk. Skr. VI. Nat. og Mat. 11 : 51. /. 47. 



2. Marathrum Schiedeanum Cham. Ivinnaea 9 : 504. 1835. 



Lads foeniculacea Schlecht. & Cham. Linnaea 6 : 42, excl. syn. 1831. 

 Lads Schiedeana Cham. Linnaea 9 : 504. 1835. 



Maralhrum flex:uosu-m Liebm. Forh. Skand. Nat. Kiob. 1849 : 511. 1849. 

 Marathrum lenue Liebm. Forh. Skand. Nat. Kiob. 1849 : 511, 1849. 



Rhizome creeping, thick, elongated. Leaves 4 dm. long or less and 2-4 cm. broad, the 



petiole 1.5-14 cm, long, the blade with the divisions spreading or ascending, 4-pinnatifid, 



the ultimate divisions linear ; pedicel, when mature, 2-8 cm. long, straw-colored, rather 



abruptly enlarged at the apex into a bowl-shaped hypanthium 1.5-2.5 mm. broad ; stamens 



6-8, the filaments subulate or narrowly linear, from a little shorter than the capsule to 



somewhat exceeding it ; capsule ellipsoid, obtuse, about 5 mm. long, obscurely 8-nerved. 



Type locality : Rio de Actopan near Actopan, Mexico. 

 Distribution : Mexico, Guatemala and Colombia. 



Illustrations : Ivinnaea 9 : pi. ($, as Lads Schiedeana ; Schnitzl. Icon. pi. 85, f. 3 ; Vidensk. 

 Selsk. Skr. VI. Nat. og Mat. 11 : 40, 41,/ 35, 36 and 46, 47,/. 43^5. 



Marathrum 



Habana 7: 561. 1871. 



Rhizome fleshy, rather short. Leaves 2.5 dm. long or less, 2-5 cm. wide, the petiole 

 commonly 4-5 cm. long, fleshy, the blade usually less than 2 dm. long, 3-4-pinnatifid, the 

 ultimate divisions about 1 mm. long or less, linear, acute or sometimes obtuse ; pedicel less 

 than 1 cm, long and not at all, or but very little, enlarged at the apex ; stamens 5-7, the 

 filaments subulate, a little shorter than to somewhat exceeding the capsule ; capsule ellip- 

 soid, 2.3-2.8 mm. long, obtuse. 



Type locality : Sebastian River, Pinar del Rio, Cuba. 

 Distribution : Cuba. 



4. Marathrum modestum (Wedd.) Nash. 



Marathrum. Schiedeanum modestum, Wedd. in DC. Prodr. 17 : 54. 1873. 



A small plant. Rhizome disc-like, lobed : leaves 2.5-6 cm. long, the petiole 5-15 mm. 

 long, rather slender, the blade 2-3.5 cm. long, the rachis rather narrow, 4-pinnatifid, the 



