628 



Plants of the Punjah, 



WATEK PLANTS. 

 Herbs with Opposite Exstipulate Lobed Leaves, 



Utricularia flexuosa, 



Lentibulariaceje. 

 F. B. I. iv. 329. 

 The Plains, in rice 

 fields and marshes. 



Utricularia exoleta, 



Lentibulariace^. 

 F. B. L iv. 329, 

 The Plains, in rice 

 fields and marshes 

 (uncommon). 



Ceratophyllmn 



demersum, 



Hornwort, 



Ceratophyllace^. 

 F. B. I. V. 639. 

 The Plains to 

 8,000 ft., in still 

 •water. 



Naias graminea, 



Naiadaceje. 

 F. B. I. vi. 569. 

 The Plains. 



Naias minor, 



Naiadace^. 

 F. B. L vi. 569. 

 The Plains. 



Petals united. 



like the last species, but generally larger, corolla ^-| 

 in. long, main flower stalks with only a few scales. 



like the last species, but very much smaller, capsule 

 much larger than the sepals, seeds with thin margin, open, 

 nearly entire. 



Petals none. 



rootless, submerged, slender, fragile, stem 8-36 in. 

 long, densely leaiy, green ; leaves 1 in. long, whorled, divid- 

 ed into thread-like toothed lobes, spreading in water, 

 closing together when lifted out of the water ; flowers 

 minute, axillary, sessile, male and female flowers on the 

 same plant, male flowers solitary, calyx of 6-r3, narrow, 2-fid 

 awl-like, segments, petals none, stamens 20-30, very short, 

 anthers erect, with a minute float at the top to enable it to 

 remain near the surface, pollen of the same specific gravity 

 as the water to enable it to float about till it strikes a stigma, 

 female with the same calyx as the male flower, no stamens, 

 ovary sessile, ovoid, one-celled, style awl-like, stigmated 

 surface on one side ; fruit a small leathery ovoid, some- 

 what flattened nut with a hooked style on the top, and 

 2 curved spurs on each side above the base. 



rootstock creeping, submerged, stem 1-2 ft., branched, 

 thread-like ; leaves | to 1 in., narrowly linear, long-pointed, 

 soft, sharply many-toothed, basal lobes (auricles) erec , 

 lanceolate, toothed on both edges ; flowers male and 

 female on the same plant, minute, axillary, clustered, 

 male flowers consist of an outer tubular or inflated tube 

 with a thin transparent inner one, stamen one, united to 

 the inner tube, female flowers consist of one sessile carpel 

 with or without a transparent tube outside, stigmas 2-4. 

 slender ; achenes oblong, seed erect. 



very like the last species, but very slender, much 

 branched, leaves less acutely toothed, less broad, les? 

 transparent, basal auricles rounded. 



