PIPEEACE.E 



447 



Houttuynia. In the genus Lactoris, where perisperm is com- 

 paratively scanty, it is oily rather than farinaceous. 



Seedlings. The embryo is very small while in the seed, 

 but attains a relatively large size during germination, and the 

 cotyledons assume somewhat the form of the seed. TIT Piper 

 celtidifolium (fig. 625) they are broadly triangular, cuspidate, 

 truncate at the base or inclined to cordate, membranous, and 

 faintly trinerved. The first leaf is cordate and five-nerved, 

 with strong sheaths at the base of the petiole. The next two 

 are more elongated and more deeply auricled at the base, but 

 otherwise similar. The hypocotyl of Peperomia fernandeziana 

 is short and fleshy. The cotyledons are ovate, cuspidate and 

 fleshy with no apparent venation. The stem is also fleshy. 

 The first two leaves are oval or sometimes obovate, followed by 

 three which are oblong and gradually larger. 



Piper celtidifolium, Hamilt. (fig. 625). 



Hypocotyl erect, terete, glabrous, 5-8 mm. long. 



Cotyledons broadly triangular, obtusely cuspidate, petiolate, 

 rather indistinctly trinerved, and reticulate, membranous, gla- 

 brous, truncate at the base or faintly inclined to be cordate, 

 8-5-9-5 mm. long, 9-5- 

 10'5 mm. wide ; petiole 

 slightly channelled above, 

 4 mm. long. 



Stem erect, terete, 

 somewhat zigzag from 

 node to node, glabrous, 

 somewhat striate ; 1st 

 internode undeveloped ; 

 2nd 6'5 mm. long. 



Leaves simple, entire, 

 cauline, alternate, ex- 

 stipulate, petiolate, three- 



to five-nerved from the FIG. 625. Piper celtidifolium. Nat. size. 



base, and reticulate, gla- 

 brous ; petioles channelled above, sheathing the stem at the base, 

 glabrous. 



No. 1. Cordate, obtuse, entire. 



Nos. 2 and 3. More elongated and more deeply auricled at the 

 base. 



