12 
COPELAND. 
M A RSI LEA Linnaeus. 
Normal leaves long-stalkecl, 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 1. M. quadrifolia 
Pedicel not adnate to base of stipe. 
Pedicel longer than the fruit. 
Three fruits at the base of each leaf 2. M. minuta 
Two fruits at the base of each leaf. 
Fruit longer than broad, .3 mm long 3. M. crcmta 
Fruit as broad as long, very small 4. If. brachycarpa 
Pedicel shorter than the fruit :. 5. ill., brachypus 
Pedicels not branched, one at base of each leaf. 
Leaves without pellucid streaks. 
Sporoearps nearly round, densely silky 6. M . condensata 
Sporoearps nearly square, glabrescent 7. M. quadrata 
Leaves with pellucid streaks 8. M . coromandelica 
1. Marsilea quadrifolia L. 
Rhizome wide-creeping under water; stipe 8-15 cm long; leaflets ob- 
deltoid, 15 mm more or less long, entire, outer side rounded, glabrous; 
pedicels in all 15 to 30 mm long, attached halfway more or less to the 
stipe, forked above this and bearing 2 to 4 sporoearps; sporoearps 3 to 4 
mm long, round-oblong, glabrescent, not bordered, with two minute basal 
teeth ; sori 16 to 20 in each sporoc-arp. 
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 cm 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; sporoearps about 3 mm long, not quite so broacl, 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 IX.) 
Stipes 10 cm more or less high, leaflets 12 to 18 mm long, or much 
smaller when terrestrial, glabrous; sporoearps 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. 
Bot. 3 (1908) 276, is exactly this species; both Presl and Christ mention 
pellucid streaks, but I can not see them. 
Philippines, from Ilocos, Luzon, to Davao. 
