208 acters) for distinguishing genera, yet here and there among species 

 th-t unouestionably belong to the same genus variations occur in 

 fruit-structure that must be disregarded from a generic point of 

 view: such characters as the presence or absence of placental tub- 

 ercles presence or absence or rudimentary development of cell-wmgs 

 and th4 contiguity or separation and divergence of the expanding- 

 keels are ai 1 liable to variation occasionally. therefore, J- 

 regard IT. mitratum as not generically distinct from the others e- 

 numerated here, but it cannot be accer^ted as the type of the genus, 

 as tbe structure of its fruit is stated to be different from that 

 original iv assigned to Kitrophyllum. I have only seen fruit of 

 M gr^nde^ which was attached to the plant and exactly conforms with 

 the characters of the fruit as described originally ^by ^chwentes , 

 and as he has not mentioned which of the knov/n species is the type 

 from which the characters of his original description were made, J- 

 Tjronose that M. grande be taken as the type of the genus. 



N. E. Brov/n 

 (To be continued. ) 



MSSEI'£BRYANTHEMUK . 

 Gard. Chron. HI. 85: 227. 1929. 

 (Continued from page 208.) 



MITROPHYLLUIvI, Schwant. 

 Key to the "-'pecies. 



ppn 1. Plants in flower not more than about l-li inch high. 



8. nanum and i^chickianum. 



Plants from a few inches to two feet high. 2 



2. United pairs of leaves forming conical bodies stouter than 



the branches that they terminate. 3 



United pairs of leaves forming cylindric bodies not stou- 

 ter than the branches they terminate; dwarf shrublets 

 6-12 inches high, with distinct internodes. 7 



3. Internodes distinctly developed on both vegetative and 



flowering parts of the plant and varying from i-lg 



inches long and l-|-3 inches thick. 4 



Internodes of the vegetative growths suppressed and crow- 

 ded together or not more than about 1-li lines long; 

 those of the flowering parts elongated and ^-S inches 

 long. 



4. Internodes 1-2^ inches long, and ther terminal cone sep- 



arated from the lateral cones next below it by an m- 

 ternode l-2-| inches long; free leaves 4-6 lines broad 

 at the base; -etals yellow. 5. dissitum. 



Internodes i-1 inch lon^-^, and the terminal cone sub-ses- 

 " sile among the lateral cones or only separated from them 

 by an internode 2-6 lines long; free leaves 4-7 lines 

 broad at the base; flov/ers unknov.m. 4. proximum. 



