1 2 COl'ELAND. 



MARSILEA Linnaeus. 



Norma] Leaves long-stalked, the blade cruciform. Fifty-six recognized 

 species, in tropical, subtropical and temperate countries. The species 

 vary exceedingly with the habitat and those listed here are probably not 

 all distinct. 

 Pedicels branched or clustered. 



Pedicel adnate to base of stipe ], M. quadrifoUa 



Pedicel not adnate to base of stipe. 

 Pedicel longer than the fruit. 



Three fruits at the base of each leaf 2. .)/. minuta 



'two fruits at the base of each leaf. 



Fruit longer than broad, .'5 nun long 3. .1/. crenata 



Fruit as broad as long, very small 4. M . brachyoarpa 



Pedicel shorter than the fruit .->. M.brachvpus 



Pedicels not branched, one at base of each leaf. 



Leaves without pellucid streaks. 



Sporocarps nearly round, densely silky <;. U.eondensata 



Sporocarps nearly square, glabrescent..... 7. M.qwtdrata 



Leaves with pellucid streaks s. U. coromandelica 



1. Marsilea quadrifolia L. 



Rhizome wide-creeping under water; stipe 8-15 cm long: leaflets <>b- 

 deltoid, 15 mm more or less long, entire, outer side rounded, glabrous; 

 pedicels in all 15 to 30 nun long, attached halfway more or less to the 

 stipe, forked above this and bearing 2 to 4 sporocarps; sporocarps 3 to 4 

 mm long, round-oblong, glabrescent, not bordered, with two minute basal 

 teeth; sori 1G to 20 in each sporocarp. 



Europe to northern India and Japan: Connecticut. 



2. Marsilea minuta L. 



Stipe 5 cm more or less high; Leaflets cuneate-obdeltoid, glabrous or 

 nearly. SO, 1 em more or less long, outer edge toothed or almost entire: 

 pedicels 3 to 5 mm high, usually 3 together, distinct unless at the very 

 base: sporocarps about 3 mm long, not quite so broad, with distinct 

 border and ribs, and two basal teeth of which the lower is obscure, silky 

 when young, but more or less glabrous at maturity. 



India. Java. 



3. Marsilea crenata Presl. (Plate 1\.) 



Stipes 10 cm more or less high, leaflets 12 to 18 mm long, or much 

 smaller when terrestrial, glabrous; sporocarps normally 2,. but one of 

 these sometimes abortive, and at the base of several clustered, upper 

 tooth sharp and prominent, margin not well developed, and ribs none; 

 otherwise like M. minuta. M. Mearnsii Christ in Philip. Journ. Sci. 

 Rot. 3 (1908) 27G, is exactly this species; both Presl and Christ mention 

 pellucid streaks, but T can not see them. 



Philippines, from Ilocos, Luzon,, to Davao. 



