PEIMULACE^E 179 



are linear-spathulate or oblong. A fourth type is presented by 

 Cyclamen. This genus has only one cotyledon which soon 

 becomes foliaceous and of large size resembling a true leaf. The 

 cotyledon of Cyclamen persicum is cordate and more or less 

 crenate, greatly resembling the first true leaf. In a batch of 

 seedlings, individuals may frequently be found having the 

 cotyledons consisting of two reniform, sessile, or stalked pieces 

 resembling a compound leaf with a pair of leaflets. The 

 apparently compound character is perhaps due to the union of 

 the petioles of the cotyledon and the first true leaf, as occa- 

 sionally happens in the case of the peduncles and the leaves. 



Primula elatior, Jacq. (fig. 497). 



Primary root normal, ultimately giving way to the strong 

 adventitious roots developed below the cotyledons and the rosette 

 of leaves. 



Hypocotyl slender, about 6 mm. long, colourless. 



Stem a short, persistent, fleshy, or almost 

 woody rhizome with undeveloped or slightly 

 developed internodes. 



Cotyledons ovate-oblong, obtuse, somewhat 

 succulent, pale green, glabrous ; lamina 5-7 mm. 

 long, 3-4 mm. wide ; petiole slightly chan- 

 nelled above, slightly pubescent, 3'5 mm. long. 



Leaves simple, radical, alternate, exstipu- 

 late, petiolate, rugose, glabrous above, hairy 

 beneath ; petioles (in young plant) deeply 

 channelled above, not winged, hairy, almost 

 villous on the under side. 



No. 1. Eeniform, repand-dentate, with short, FIG 497 



broad, mucronate teeth, and a diverging basal Primula elatior. 

 sinus, reticulate. 



No. 2. Kotund-cordate, dentate-serrate, convex above with re- 

 curved mucronate teeth. 



Ultimate leaves oblong-ovate, abruptly decurrent on the petiole, 

 shallowly and subrepandly dentate, alternately penninerved, reticu- 

 late, rugose. 



Primula denticulata, Sm. 



Hypocotyl subterranean or short. 



Cotyledons apparently springing straight from the root, ovate, 



N 2 



