106 TETRANDRIA. DIGYNIA. 



Species. 1. S. fcsfida. Well known as a rank and 

 clfeiisive weed thnxigiiout the Uniied States, fronn (Janu- 

 da to Carolina. 'Ihe gc-nus Pothon to which this plant i8 

 ailed, though very distinct, exists almost exclusively 

 wahm the tropical parts of America. 



158. ALCHEMILLA. L, (Ladies-mantle.) 



Calix tnliulous, border spreading, 8-cleft, 

 segments alternately smaller. Petals^, Stami- 

 na very small. Germ 1; style 1, lateral, tVom 

 the base of the germ. Stigma 1. Seed 1, covered 

 by the ronnivent calix. 



Herbs with palmate or subdif^itate leaves; flowers co- 

 P} nibose axillary and terminal. 



Specjes. 1. ^. a'piiia. On the mountains oi New 

 Hampshire. A plant common to the alpme .eg-ions of Eu- 

 rope. This genus, containing- 6 species, with tlie excep- 

 tion of 1 at tlie Cape of (iood Hope, and another in New 

 Granada, is confined to Europe. 



Order II. — Digy^ia. 



159. APHANES. L. (Parsley Piert.) 



Calix 8-cleft. alternate segments minufe. 

 Petals 0. Stamina minute. Styles 2. Seeds 2, 



place of acotjledon there is a sheathing stipule similar to that 

 which is ever after produced; in fact it is vivip.trous. The em- 

 bryon is seated in a small umbil.c;il or hemispherical depres- 

 sion, in the upper end of what may be called a vitellns rather 

 than a perisperm, judging- from its functions; this callus, or 

 seminal tubercle is roundish and turbinate, nearly as large as 

 a filbert mit, very solid and carneous, possessing in a high de- 

 gree the adiaceous tcetDr of the yrown plant; the mutual point 

 of attachment sul)s. sting betwixt this body and the embryon is 

 at first a minute and nearly central funiculus which enlarges 

 and becomes more distinct during the progress of germination; 

 but what appears to be mos« singular in it, is the length of time 

 which It continues attached to the growing plant, apparently 

 inert at the base of the caudex for twelve or even eighteen 

 months. 



