10 



ON SEEDLINGS 



furnished with tufts of slender, white, glabrous bristles seated on 

 the top of little woolly-capped elevations, in five or six rows. 

 Leaves none. 



Phyllocactus stenopet- 

 alus, Salm-Dyck (fig. 397). 



Hypocotyl stout, erect, 

 terete, glabrous, 1-8-2-4 

 cm. long, green. 



Cotyledons ovate or 

 oblong, fleshy, acute, en- 

 tire, sessile, connate at the 

 base, very unequal, gla- 

 brous, green, without any 

 venation. 



Stem fleshy or succu- 

 lent, erect, much flattened, 

 leafless, with small tufts 

 of hairs or bristles at the 

 nodes, otherwise glabrous, 

 crenate or notched along 

 the edges. 



Opuntia Rafinesquii 

 Engelm. 



Fruit a fleshy pulpy 

 berry, many-seeded. 

 Seed subrotund or oblate, much flattened laterally ; testa hard r 

 bony, rugose ; hilum rather conspicuous. 



Endosperm scanty, farinaceous, surrounded by the embryo and 

 white. 



Embryo curved, lying on the outside of the endosperm ; cotyle- 

 dons linear, curved at the end, obtuse, entire, lying the narrow 

 way of the seed with their faces to the axis ; radicle slightly longer 

 than the cotyledons, incumbent, terete, obtuse. 



Opuntia basilaris, Engelm. et Big. (fig. 398). 



Primary root short, succulent, woolly, tapering downwards, with 

 a few short, lateral, fibrous rootlets. 



Hypocotyl succulent, 1-2 cm. long, 3-4 mm. thick, slightly 

 compressed, glabrous, of a dull bronze colour, reddish later. 



Cotyledons sessile, 1-5-3-5 cm. long, about 4 mm. thick near 

 the base, subulate, similar to the hypocotyl in outer appearance, 



FIG. 897. Phyllocactus stenopetalus. 

 Nat. size. 



