ROSACES. 13 



Subg. in. Idaeobatus. 



Key to the species. 



A. Leaves simple 



a. Calyx greenish in living specimens, but turning black when dried, 

 nearly glabrous on the back leaving the margin hairy, petals 

 white usually reflexed 1. R. conduplicatus=R. retusipetala. 



b. Calyx greenish in living specimens, but turning pale brown when 

 dried, finely pubescent on the back or aculeolate on the back, 

 petals white usually erect or semi-closed. 



a. Calyx aculeolate on the back 



*Leaves sinuately trilobed 2. R. taitoensis. 



**Leaves shallowly trilobed 



Leaves cordate at the base 3. R. mingetsensis. 



Leaves truncate at the base... 4. .R. aculeatiflorus. 

 /9. Calyx simply pubescent 



*Carpels densely villose 5. R. arisunensis. 



6. R. arisanensis var. horisliae'nsis. 

 **Carpels less villose 7. R. shinkoensis. 



B. Leaves compound 



a. Very dwarf plant, erect, at most 10 cm. tall, leaflets small 1 cm. 

 long quite glabrous 8. R. elegans. 



b. Scandent, leaflets longer than 2 cm. 



a. Stem, petioles, peduncles densely glanduloso-barbate. 



*Leaves trifoliolate glabrous, terminal leaflets rounded 



nearly 10cm. in diameter 9. R. fasciculatus. 



**Leaves 3-7-foliolate hirsute, terminal leaflet oblong less 

 than 5 cm. long. 



Branches and petioles not velvety, simply glandu- 

 loso-barbate 10 . R. glanduloso-calycinus. 



Branches and petioles densely villose and glandu- 

 loso-barbate. 



^Carpels hirsute 11. R. Somai. 



AA Carpels glabrous 



