THE BUCKBEAN FAMILY. 431 



FLOATING-HEART. 



Limndnthemuin laciinbsiim. 



Flowers : growing in an umbel at the summit of the long stem or stolon and 

 from under one of the short-petioled leaves. Calyx: five-parted. Corolla : wheel- 

 siiaped, the five lobes often ciliate and incurved at the edges. Stamens: five, 

 alternating with five glands. Stigma: two-lobed. Capsule: containing numerous 

 smooth seeds. Leaves: ovate, or circular with deejily cordate base and growing 

 at the ends of long stems, entire, spongy, often coloured with deep purple. 



Altogether associated with the life of the water are the floating-hearts, 

 and curious enough they appear, as from under their rounded floating leaves 

 they bear their small, systematically arranged flowers. As the season 

 advances it is noticed moreover that root-like tubers are formed at the ends 

 of the stalks and under the water's surface, for the plant follows somewhat 

 the same method of reproducing itself as do tiger lilies. F'inally these tubers 

 detach themselves from the parent plant and sink to the underlying mud, 

 where snugly they rest until the next season's warm sun coaxes them to 

 send up the plants they hold in readiness. 



L. aqiiaticum, {Plate CXLIV), an altogether larger plant than its relative, 

 is still readily known as belonging to the same order by its similar construc- 

 tion. The circular leaves, with narrow deep sinuses, are smooth and apple- 

 green. Other differences are found in its white flowers and in that the seeds 

 they bear are quite rough. 



THE DOGBANE FAMILY. 



Apocynaccce. 



Including m our range shrubs., herbs or vines 7vith niilky, acrid juice., 

 simple leaves growing in various positions ; and 7vhich bearJIo2c>crs with 

 gamopetalous corollas^ regular and perfect, and produced in cymes, or 

 panicles. 



AMSONIA. 



Anisbnia Amsbnia. 



Flowers ; growing in terminal cyniose-panicles. Calyx : minute, five-parted. 

 Corolla: salver-form, with five spreading, linear segments. Stamens: five, in- 



